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为何数据线中会串联22或10欧电阻? [复制链接]

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dstonion 发表于 2007-10-17 14:28:00 |显示全部楼层 |返回版面
看到很多从CPU GPIO口出来的数据线中都会串联22或10欧的电阻,LCM的数据线中也会22欧的排阻,串联这些电阻的目的是什么呢?我问过很多人大都没有个比较有说服力的答案,比如延时作用等,大牛们有何高见?
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computer00 发表于 2007-10-17 15:22:00 |显示全部楼层 |返回版面

阻抗匹配和减少EMI。

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dstonion 发表于 2007-10-17 15:31:00 |显示全部楼层 |返回版面

那为什么都是22欧的呢?是经验值吗?

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xzl 发表于 2007-10-17 15:33:00 |显示全部楼层 |返回版面

有经验值,也可以根据情况调整参数

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computer00 发表于 2007-10-17 15:36:00 |显示全部楼层 |返回版面

通常在几十欧这样子。

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quben 发表于 2007-10-17 16:01:00 |显示全部楼层 |返回版面

关于阻抗匹配的小知识

阻抗匹配是指负载阻抗与激励源内部阻抗互相适配,得到最大功率输出的一种工作状态。对于不同特性的电路,匹配条件是不一样的。 

在纯电阻电路中,当负载电阻等于激励源内阻时,则输出功率为最大,这种工作状态称为匹配,否则称为失配。   

当激励源内阻抗和负载阻抗含有电抗成份时,为使负载得到最大功率,负载阻抗与内阻必须满足共扼关系,即电阻成份相等,电抗成份只数值相等而符号相反。这种匹配条件称为共扼匹配。   

从能量的传输角度看,为使在传输系统中无反射产生,就要求负载阻抗等于传输线或四端网络的特性阻抗,即电阻成份和电抗成份分别相等,而不是共扼相等。这种匹配条件称为无反射匹配或对象匹配。
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computer00 发表于 2007-10-17 16:13:00 |显示全部楼层 |返回版面

另一份参考:

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qguangdong 发表于 2007-10-17 16:20:00 |显示全部楼层 |返回版面

学习了 感谢 computer00
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dstonion 发表于 2007-10-17 18:14:00 |显示全部楼层 |返回版面

感谢热心网友,学习先~

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quben 发表于 2007-10-17 18:27:00 |显示全部楼层 |返回版面

圈圈的好家当,还好我又来看了一下

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wishcom 发表于 2007-10-17 22:11:00 |显示全部楼层 |返回版面

受教了

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qjy_dali 发表于 2007-10-18 02:12:00 |显示全部楼层 |返回版面

看看霍华德的那本<<高速数字设计>>

包你大有长进
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HWM 发表于 2007-10-18 08:43:00 |显示全部楼层 |返回版面

其实在视频电路中也很常见(不过那是串75欧)。

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computer00 发表于 2007-10-18 09:34:00 |显示全部楼层 |返回版面

75欧姆是阻抗匹配用的。

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lp1468 发表于 2010-5-3 15:38:33 |显示全部楼层 |返回版面
14# computer00

你好~他问的问题也是我正好想问的,对于低频的匹配不用考虑传输线的特性阻抗,那我们只要考虑负载和输出端阻抗的匹配就可以了,那么在不知情的情况下,我看到很多的设计都加了22ohm的串联电阻,很是不解,就连一些单片机的串口都加了22ohm的串联电阻,会不会是这样22ohm只一个经验值,然后做好电路在根据实际情况调整呢?希望给我详细的说说~谢谢了
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大道至简 发表于 2010-5-4 14:52:46 |显示全部楼层 |返回版面
这个问题在我的《感悟设计》里面有很好的解释
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tjzyh 发表于 2010-5-4 15:32:23 |显示全部楼层 |返回版面
猜测:这个主要消除高频振荡用的,提高数据传输的可靠性,数据线上串联了一个小的阻尼电阻,我想主要是考虑要与PCB走线上的电感和元件管教电容相匹配。关于这方面的知识可以参看rlc串联电路分析。这个电阻就和MOSFET驱动电路栅极所加的电阻功能一样的。
个人理解。供参考。
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tjzyh 发表于 2010-5-4 15:42:58 |显示全部楼层 |返回版面
这个电阻的取值和PCB上的走线电感和分布电容有关,λ等于电阻乘以根号下电感l处以电容,电感的取值一般在十几个nH 电容越几十到几百个PF。取1>λ>0.7 比较合适。也可以通过测试波形(方波)调整此电阻值。
该电阻值跟驱动电路的内阻是串联在一起的,如果驱动电阻内阻比较大,其实该电阻也可以去掉的。
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buqibushe 发表于 2010-5-10 08:57:59 |显示全部楼层 |返回版面
根据原厂的说法:GPIo数据线串的是阻抗匹配的,一般不会超过50OHM,LAYOUT时靠近MCU,而液晶屏数据线上是用来减少EMI的
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mt4062 发表于 2010-5-12 21:11:45 |显示全部楼层 |返回版面
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) ) [152201] => Array ( [pid] => 152201 [fid] => 6 [tid] => 24314 [first] => 0 [author] => computer00 [authorid] => 157621 [subject] => 通常在几十欧这样子。 [dateline] => 2007-10-17 15:36:00 [message] => [useip] => 218.192.169.86 [invisible] => 0 [anonymous] => 0 [usesig] => 0 [htmlon] => 1 [bbcodeoff] => 0 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 157621 [username] => computer00 [groupid] => 3 [adminid] => 3 [regdate] => 2003-8-15 [credits] => 105883 [email] => computer-lov@tom.com [memberstatus] => 0 [lastactivity] => 1406128551 [authorinvisible] => 0 [extcredits1] => 3889 [extcredits2] => 0 [extcredits3] => 3635 [extcredits4] => 0 [extcredits5] => 101994 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 427 [posts] => 13898 [threads] => 216 [digestposts] => 35 [doings] => 0 [blogs] => 223 [albums] => 1 [sharings] => 0 [attachsize] => 113692 [views] => 2539 [oltime] => 581 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 30 [ccount] => 25 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 0 [site] => http://computer00.21ic.org [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => Array ( [0] => Array ( [name] => 永恒之光奖章 [image] => medal_10.gif [description] => 等级类勋章 [medalid] => 21 ) [1] => Array ( [name] => 技术导师奖章 [image] => medal_30.gif [description] => 人才类勋章 [medalid] => 41 ) [2] => Array ( [name] => 七世轮回 [image] => medal_25.gif [description] => 时间类勋章 [medalid] => 36 ) [3] => Array ( [name] => 坚毅之洋流 [image] => medal_18.gif [description] => 发帖类勋章 [medalid] => 29 ) ) [signature] => [customstatus] => 初入江湖 [thismonth] => 1005 [total] => 34830 [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 5 [dbdateline] => 1192606560 [usernameenc] => computer00 [readaccess] => 100 [authortitle] => 版主 [stars] => 9 [upgradecredit] => [taobaoas] => [lastdate] => 2014-7-23 [authoras] => computer00 [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
积分
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16小时45分
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105883
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本月在线
16小时45分
) ) [152202] => Array ( [pid] => 152202 [fid] => 6 [tid] => 24314 [first] => 0 [author] => quben [authorid] => 414904 [subject] => 关于阻抗匹配的小知识 [dateline] => 2007-10-17 16:01:00 [message] => 阻抗匹配是指负载阻抗与激励源内部阻抗互相适配,得到最大功率输出的一种工作状态。对于不同特性的电路,匹配条件是不一样的。 

在纯电阻电路中,当负载电阻等于激励源内阻时,则输出功率为最大,这种工作状态称为匹配,否则称为失配。   

当激励源内阻抗和负载阻抗含有电抗成份时,为使负载得到最大功率,负载阻抗与内阻必须满足共扼关系,即电阻成份相等,电抗成份只数值相等而符号相反。这种匹配条件称为共扼匹配。   

从能量的传输角度看,为使在传输系统中无反射产生,就要求负载阻抗等于传输线或四端网络的特性阻抗,即电阻成份和电抗成份分别相等,而不是共扼相等。这种匹配条件称为无反射匹配或对象匹配。 [useip] => 121.51.58.44 [invisible] => 0 [anonymous] => 0 [usesig] => 0 [htmlon] => 1 [bbcodeoff] => 0 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 414904 [username] => quben [groupid] => 15 [adminid] => 0 [regdate] => 2005-6-17 [credits] => 1273 [email] => zhaofree2005@163.com [memberstatus] => 0 [lastactivity] => 1394934610 [authorinvisible] => 0 [extcredits1] => 113 [extcredits2] => 0 [extcredits3] => 447 [extcredits4] => 0 [extcredits5] => 1160 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 0 [posts] => 271 [threads] => 56 [digestposts] => 0 [doings] => 0 [blogs] => 0 [albums] => 0 [sharings] => 0 [attachsize] => 0 [views] => 0 [oltime] => 17 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 12 [ccount] => 0 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 0 [site] => [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => [signature] => [customstatus] => [thismonth] => 0 [total] => 1045 [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 6 [dbdateline] => 1192608060 [usernameenc] => quben [readaccess] => 90 [authortitle] => 助理工程师 [stars] => 6 [upgradecredit] => 727 [taobaoas] => [lastdate] => 2014-3-16 [authoras] => quben [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
积分
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1273
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) ) [152203] => Array ( [pid] => 152203 [fid] => 6 [tid] => 24314 [first] => 0 [author] => computer00 [authorid] => 157621 [subject] => 另一份参考: [dateline] => 2007-10-17 16:13:00 [message] => http://computer00.21ic.org/user1/2198/archives/2006/11025.html

http://computer00.21ic.org/user1/2198/archives/2006/11024.html [useip] => 218.192.169.86 [invisible] => 0 [anonymous] => 0 [usesig] => 0 [htmlon] => 1 [bbcodeoff] => 0 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 157621 [username] => computer00 [groupid] => 3 [adminid] => 3 [regdate] => 2003-8-15 [credits] => 105883 [email] => computer-lov@tom.com [memberstatus] => 0 [lastactivity] => 1406128551 [authorinvisible] => 0 [extcredits1] => 3889 [extcredits2] => 0 [extcredits3] => 3635 [extcredits4] => 0 [extcredits5] => 101994 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 427 [posts] => 13898 [threads] => 216 [digestposts] => 35 [doings] => 0 [blogs] => 223 [albums] => 1 [sharings] => 0 [attachsize] => 113692 [views] => 2539 [oltime] => 581 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 30 [ccount] => 25 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 0 [site] => http://computer00.21ic.org [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => Array ( [0] => Array ( [name] => 永恒之光奖章 [image] => medal_10.gif [description] => 等级类勋章 [medalid] => 21 ) [1] => Array ( [name] => 技术导师奖章 [image] => medal_30.gif [description] => 人才类勋章 [medalid] => 41 ) [2] => Array ( [name] => 七世轮回 [image] => medal_25.gif [description] => 时间类勋章 [medalid] => 36 ) [3] => Array ( [name] => 坚毅之洋流 [image] => medal_18.gif [description] => 发帖类勋章 [medalid] => 29 ) ) [signature] => [customstatus] => 初入江湖 [thismonth] => 1005 [total] => 34830 [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 7 [dbdateline] => 1192608780 [usernameenc] => computer00 [readaccess] => 100 [authortitle] => 版主 [stars] => 9 [upgradecredit] => [taobaoas] => [lastdate] => 2014-7-23 [authoras] => computer00 [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
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本月在线
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) ) [152204] => Array ( [pid] => 152204 [fid] => 6 [tid] => 24314 [first] => 0 [author] => qguangdong [authorid] => 471081 [subject] => * [dateline] => 2007-10-17 16:20:00 [message] => 学习了 感谢 computer00 [useip] => 58.246.17.2 [invisible] => 0 [anonymous] => 0 [usesig] => 0 [htmlon] => 1 [bbcodeoff] => 0 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 471081 [username] => qguangdong [groupid] => 34 [adminid] => 0 [regdate] => 2006-8-17 [credits] => 2490 [email] => qguangdong83@yahoo.com [memberstatus] => 0 [lastactivity] => 1355898547 [authorinvisible] => 0 [extcredits1] => 9 [extcredits2] => 0 [extcredits3] => 213 [extcredits4] => 0 [extcredits5] => 2481 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 1 [posts] => 112 [threads] => 15 [digestposts] => 0 [doings] => 0 [blogs] => 0 [albums] => 0 [sharings] => 0 [attachsize] => 0 [views] => 1 [oltime] => 0 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 0 [ccount] => 0 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 1 [site] => [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => [signature] => [customstatus] => [thismonth] => 0 [total] => 75 [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 8 [dbdateline] => 1192609200 [usernameenc] => qguangdong [readaccess] => 90 [authortitle] => 初级工程师 [stars] => 6 [upgradecredit] => 510 [taobaoas] => [lastdate] => 2012-12-19 [authoras] => qguangdong [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
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本月在线
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) ) [152205] => Array ( [pid] => 152205 [fid] => 6 [tid] => 24314 [first] => 0 [author] => dstonion [authorid] => 502086 [subject] => 感谢热心网友,学习先~ [dateline] => 2007-10-17 18:14:00 [message] => [useip] => 222.156.254.83 [invisible] => 0 [anonymous] => 0 [usesig] => 0 [htmlon] => 1 [bbcodeoff] => 0 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 502086 [username] => dstonion [groupid] => 10 [adminid] => 0 [regdate] => 2007-5-9 [credits] => 13 [email] => jiang.steven@iac.com.tw [memberstatus] => 0 [lastactivity] => 1178678640 [authorinvisible] => 0 [extcredits1] => 0 [extcredits2] => 0 [extcredits3] => 200 [extcredits4] => 0 [extcredits5] => 13 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 0 [posts] => 4 [threads] => 1 [digestposts] => 0 [doings] => 0 [blogs] => 0 [albums] => 0 [sharings] => 0 [attachsize] => 0 [views] => 0 [oltime] => 0 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 0 [ccount] => 0 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 1 [site] => [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => [signature] => [customstatus] => [thismonth] => [total] => [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 9 [dbdateline] => 1192616040 [usernameenc] => dstonion [readaccess] => 10 [authortitle] => 实习生 [stars] => 1 [upgradecredit] => 37 [taobaoas] => [lastdate] => 2007-5-9 [authoras] => dstonion [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
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本月在线
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) ) [152206] => Array ( [pid] => 152206 [fid] => 6 [tid] => 24314 [first] => 0 [author] => quben [authorid] => 414904 [subject] => 圈圈的好家当,还好我又来看了一下 [dateline] => 2007-10-17 18:27:00 [message] => [useip] => 121.51.58.44 [invisible] => 0 [anonymous] => 0 [usesig] => 0 [htmlon] => 1 [bbcodeoff] => 0 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 414904 [username] => quben [groupid] => 15 [adminid] => 0 [regdate] => 2005-6-17 [credits] => 1273 [email] => zhaofree2005@163.com [memberstatus] => 0 [lastactivity] => 1394934610 [authorinvisible] => 0 [extcredits1] => 113 [extcredits2] => 0 [extcredits3] => 447 [extcredits4] => 0 [extcredits5] => 1160 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 0 [posts] => 271 [threads] => 56 [digestposts] => 0 [doings] => 0 [blogs] => 0 [albums] => 0 [sharings] => 0 [attachsize] => 0 [views] => 0 [oltime] => 17 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 12 [ccount] => 0 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 0 [site] => [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => [signature] => [customstatus] => [thismonth] => 0 [total] => 1045 [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 10 [dbdateline] => 1192616820 [usernameenc] => quben [readaccess] => 90 [authortitle] => 助理工程师 [stars] => 6 [upgradecredit] => 727 [taobaoas] => [lastdate] => 2014-3-16 [authoras] => quben [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
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1273
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271
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) ) [152207] => Array ( [pid] => 152207 [fid] => 6 [tid] => 24314 [first] => 0 [author] => wishcom [authorid] => 520485 [subject] => 受教了 [dateline] => 2007-10-17 22:11:00 [message] => [useip] => 222.68.155.191 [invisible] => 0 [anonymous] => 0 [usesig] => 0 [htmlon] => 1 [bbcodeoff] => 0 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 520485 [username] => wishcom [groupid] => 13 [adminid] => 0 [regdate] => 2007-10-15 [credits] => 458 [email] => wishcom@163.com [memberstatus] => 0 [lastactivity] => 1375279044 [authorinvisible] => 0 [extcredits1] => 3 [extcredits2] => 0 [extcredits3] => 209 [extcredits4] => 0 [extcredits5] => 455 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 0 [posts] => 142 [threads] => 4 [digestposts] => 1 [doings] => 0 [blogs] => 0 [albums] => 0 [sharings] => 0 [attachsize] => 0 [views] => 1 [oltime] => 2 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 0 [ccount] => 0 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 1 [site] => [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => [signature] => [customstatus] => [thismonth] => 0 [total] => 115 [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 11 [dbdateline] => 1192630260 [usernameenc] => wishcom [readaccess] => 50 [authortitle] => 资深技术员 [stars] => 4 [upgradecredit] => 42 [taobaoas] => [lastdate] => 2013-7-31 [authoras] => wishcom [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
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) ) [152210] => Array ( [pid] => 152210 [fid] => 6 [tid] => 24314 [first] => 0 [author] => computer00 [authorid] => 157621 [subject] => 75欧姆是阻抗匹配用的。 [dateline] => 2007-10-18 09:34:00 [message] => [useip] => 218.192.169.86 [invisible] => 0 [anonymous] => 0 [usesig] => 0 [htmlon] => 1 [bbcodeoff] => 0 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 157621 [username] => computer00 [groupid] => 3 [adminid] => 3 [regdate] => 2003-8-15 [credits] => 105883 [email] => computer-lov@tom.com [memberstatus] => 0 [lastactivity] => 1406128551 [authorinvisible] => 0 [extcredits1] => 3889 [extcredits2] => 0 [extcredits3] => 3635 [extcredits4] => 0 [extcredits5] => 101994 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 427 [posts] => 13898 [threads] => 216 [digestposts] => 35 [doings] => 0 [blogs] => 223 [albums] => 1 [sharings] => 0 [attachsize] => 113692 [views] => 2539 [oltime] => 581 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 30 [ccount] => 25 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 0 [site] => http://computer00.21ic.org [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => Array ( [0] => Array ( [name] => 永恒之光奖章 [image] => medal_10.gif [description] => 等级类勋章 [medalid] => 21 ) [1] => Array ( [name] => 技术导师奖章 [image] => medal_30.gif [description] => 人才类勋章 [medalid] => 41 ) [2] => Array ( [name] => 七世轮回 [image] => medal_25.gif [description] => 时间类勋章 [medalid] => 36 ) [3] => Array ( [name] => 坚毅之洋流 [image] => medal_18.gif [description] => 发帖类勋章 [medalid] => 29 ) ) [signature] => [customstatus] => 初入江湖 [thismonth] => 1005 [total] => 34830 [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 14 [dbdateline] => 1192671240 [usernameenc] => computer00 [readaccess] => 100 [authortitle] => 版主 [stars] => 9 [upgradecredit] => [taobaoas] => [lastdate] => 2014-7-23 [authoras] => computer00 [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
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) ) [1136072] => Array ( [pid] => 1136072 [fid] => 6 [tid] => 24314 [first] => 0 [author] => lp1468 [authorid] => 625760 [subject] => [dateline] => 2010-5-3 15:38:33 [message] => 14# computer00

你好~他问的问题也是我正好想问的,对于低频的匹配不用考虑传输线的特性阻抗,那我们只要考虑负载和输出端阻抗的匹配就可以了,那么在不知情的情况下,我看到很多的设计都加了22ohm的串联电阻,很是不解,就连一些单片机的串口都加了22ohm的串联电阻,会不会是这样22ohm只一个经验值,然后做好电路在根据实际情况调整呢?希望给我详细的说说~谢谢了 [useip] => 218.5.3.199 [invisible] => 0 [anonymous] => 0 [usesig] => 0 [htmlon] => 0 [bbcodeoff] => 0 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 625760 [username] => lp1468 [groupid] => 14 [adminid] => 0 [regdate] => 2010-4-22 [credits] => 830 [email] => lipeng1468@126.com [memberstatus] => 0 [lastactivity] => 1370868640 [authorinvisible] => 0 [extcredits1] => 830 [extcredits2] => 0 [extcredits3] => 132 [extcredits4] => 0 [extcredits5] => 0 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 2 [posts] => 276 [threads] => 0 [digestposts] => 0 [doings] => 0 [blogs] => 0 [albums] => 0 [sharings] => 0 [attachsize] => 0 [views] => 1 [oltime] => 114 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 54 [ccount] => 30 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 0 [site] => [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => [signature] => [customstatus] => [thismonth] => 0 [total] => 6855 [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 15 [dbdateline] => 1272872313 [usernameenc] => lp1468 [readaccess] => 70 [authortitle] => 高级技术员 [stars] => 5 [upgradecredit] => 170 [taobaoas] => [lastdate] => 2013-6-10 [authoras] => lp1468 [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
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) ) [1136812] => Array ( [pid] => 1136812 [fid] => 6 [tid] => 24314 [first] => 0 [author] => 大道至简 [authorid] => 554431 [subject] => [dateline] => 2010-5-4 14:52:46 [message] => 这个问题在我的《感悟设计》里面有很好的解释 [useip] => 211.143.199.11 [invisible] => 0 [anonymous] => 0 [usesig] => 1 [htmlon] => 0 [bbcodeoff] => -1 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 554431 [username] => 大道至简 [groupid] => 3 [adminid] => 3 [regdate] => 2008-9-9 [credits] => 32201 [email] => easy_simply@qq.com [memberstatus] => 0 [lastactivity] => 1406077547 [authorinvisible] => 0 [extcredits1] => 27032 [extcredits2] => 0 [extcredits3] => 1530 [extcredits4] => 0 [extcredits5] => 5169 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 18 [posts] => 8916 [threads] => 7482 [digestposts] => 2 [doings] => 0 [blogs] => 0 [albums] => 1 [sharings] => 0 [attachsize] => 0 [views] => 182 [oltime] => 324 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 158 [ccount] => 142 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 0 [site] => [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => Array ( [0] => Array ( [name] => 缘定三生 [image] => medal_24.gif [description] => 时间类勋章 [medalid] => 35 ) [1] => Array ( [name] => 荣誉元老奖章 [image] => medal_8.gif [description] => 等级类勋章 [medalid] => 19 ) [2] => Array ( [name] => 技术奇才奖章 [image] => medal_29.gif [description] => 人才类勋章 [medalid] => 40 ) [3] => Array ( [name] => 坚毅之洋流 [image] => medal_18.gif [description] => 发帖类勋章 [medalid] => 29 ) ) [signature] => 看大道至简所著的《感悟设计》,感悟设计的至简大道 [customstatus] => [thismonth] => 135 [total] => 19430 [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 16 [dbdateline] => 1272955966 [usernameenc] => %E5%A4%A7%E9%81%93%E8%87%B3%E7%AE%80 [readaccess] => 100 [authortitle] => 版主 [stars] => 9 [upgradecredit] => [taobaoas] => [lastdate] => 2014-7-23 [authoras] => 大道至简 [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
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) ) [1136877] => Array ( [pid] => 1136877 [fid] => 6 [tid] => 24314 [first] => 0 [author] => tjzyh [authorid] => 608410 [subject] => [dateline] => 2010-5-4 15:32:23 [message] => 猜测:这个主要消除高频振荡用的,提高数据传输的可靠性,数据线上串联了一个小的阻尼电阻,我想主要是考虑要与PCB走线上的电感和元件管教电容相匹配。关于这方面的知识可以参看rlc串联电路分析。这个电阻就和MOSFET驱动电路栅极所加的电阻功能一样的。
个人理解。供参考。 [useip] => 221.239.95.227 [invisible] => 0 [anonymous] => 0 [usesig] => 0 [htmlon] => 0 [bbcodeoff] => -1 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 608410 [username] => tjzyh [groupid] => 14 [adminid] => 0 [regdate] => 2010-2-8 [credits] => 858 [email] => piaobb521@163.com [memberstatus] => 0 [lastactivity] => 1404956738 [authorinvisible] => 0 [extcredits1] => 858 [extcredits2] => 0 [extcredits3] => 1855 [extcredits4] => 0 [extcredits5] => 0 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 2 [posts] => 284 [threads] => 9 [digestposts] => 0 [doings] => 0 [blogs] => 0 [albums] => 2 [sharings] => 0 [attachsize] => 0 [views] => 10 [oltime] => 424 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 8 [ccount] => 5 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 0 [site] => [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => Array ( [0] => Array ( [name] => 技术奇才奖章 [image] => medal_29.gif [description] => 人才类勋章 [medalid] => 40 ) [1] => Array ( [name] => 希望之星奖章 [image] => medal_1.gif [description] => 等级类勋章 [medalid] => 12 ) [2] => Array ( [name] => 甘甜之泉水 [image] => medal_13.gif [description] => 发帖类勋章 [medalid] => 24 ) [3] => Array ( [name] => 缘定三生 [image] => medal_24.gif [description] => 时间类勋章 [medalid] => 35 ) ) [signature] => [customstatus] => [thismonth] => 60 [total] => 25990 [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 17 [dbdateline] => 1272958343 [usernameenc] => tjzyh [readaccess] => 70 [authortitle] => 高级技术员 [stars] => 5 [upgradecredit] => 142 [taobaoas] => [lastdate] => 2014-7-10 [authoras] => tjzyh [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
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) ) [1136890] => Array ( [pid] => 1136890 [fid] => 6 [tid] => 24314 [first] => 0 [author] => tjzyh [authorid] => 608410 [subject] => [dateline] => 2010-5-4 15:42:58 [message] => 这个电阻的取值和PCB上的走线电感和分布电容有关,λ等于电阻乘以根号下电感l处以电容,电感的取值一般在十几个nH 电容越几十到几百个PF。取1>λ>0.7 比较合适。也可以通过测试波形(方波)调整此电阻值。
该电阻值跟驱动电路的内阻是串联在一起的,如果驱动电阻内阻比较大,其实该电阻也可以去掉的。 [useip] => 221.239.95.227 [invisible] => 0 [anonymous] => 0 [usesig] => 0 [htmlon] => 0 [bbcodeoff] => -1 [smileyoff] => -1 [parseurloff] => 0 [attachment] => 0 [rate] => 0 [ratetimes] => 0 [status] => 0 [tags] => 0 [comment] => 0 [replycredit] => 0 [uid] => 608410 [username] => tjzyh [groupid] => 14 [adminid] => 0 [regdate] => 2010-2-8 [credits] => 858 [email] => piaobb521@163.com [memberstatus] => 0 [lastactivity] => 1404956738 [authorinvisible] => 0 [extcredits1] => 858 [extcredits2] => 0 [extcredits3] => 1855 [extcredits4] => 0 [extcredits5] => 0 [extcredits6] => 0 [extcredits7] => 0 [extcredits8] => 0 [friends] => 2 [posts] => 284 [threads] => 9 [digestposts] => 0 [doings] => 0 [blogs] => 0 [albums] => 2 [sharings] => 0 [attachsize] => 0 [views] => 10 [oltime] => 424 [todayattachs] => 0 [todayattachsize] => 0 [tcount] => 8 [ccount] => 5 [follower] => 0 [following] => 0 [newfollower] => 0 [gender] => 0 [site] => [icq] => [qq] => [yahoo] => [msn] => [taobao] => [alipay] => [medals] => Array ( [0] => Array ( [name] => 技术奇才奖章 [image] => medal_29.gif [description] => 人才类勋章 [medalid] => 40 ) [1] => Array ( [name] => 希望之星奖章 [image] => medal_1.gif [description] => 等级类勋章 [medalid] => 12 ) [2] => Array ( [name] => 甘甜之泉水 [image] => medal_13.gif [description] => 发帖类勋章 [medalid] => 24 ) [3] => Array ( [name] => 缘定三生 [image] => medal_24.gif [description] => 时间类勋章 [medalid] => 35 ) ) [signature] => [customstatus] => [thismonth] => 60 [total] => 25990 [privacy] => Array ( [profile] => Array ( [is_techxchange] => 0 [product] => 3 [realname] => 3 [gender] => 3 [birthday] => 3 [birthcity] => 3 [residecity] => 3 [qq] => 3 [yahoo] => 3 [msn] => 3 [taobao] => 3 [address] => 3 [zipcode] => 3 [telephone] => 3 [mobile] => 3 [graduateschool] => 3 [education] => 3 [company] => 3 [position] => 3 [revenue] => 3 [occupation] => 3 [interest_now] => 3 [use_now] => 3 [idcardtype] => 3 [idcard] => 3 [site] => 0 [bio] => 0 [interest] => 0 ) ) [verify1] => 0 [verify2] => 0 [verify3] => 0 [verify4] => 0 [verify5] => 0 [verify6] => 0 [verify7] => 0 [newpostanchor] => [lastpostanchor] => [number] => 18 [dbdateline] => 1272958978 [usernameenc] => tjzyh [readaccess] => 70 [authortitle] => 高级技术员 [stars] => 5 [upgradecredit] => 142 [taobaoas] => [lastdate] => 2014-7-10 [authoras] => tjzyh [avatar] => [groupicon] => [banned] => 0 [warned] => 0 [attachments] => Array ( ) [attachlist] => [imagelist] => [allowcomment] => 1 [custominfo] => Array ( [left] =>
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