本帖最后由 叶春勇 于 2020-6-28 11:00 编辑
我搜出了：
R1=1800.0 R2=240.0 Rg=1200.0 Rf=3000.0 k=3.125 b=1.25
R1=1800.0 R2=240.0 Rg=2000.0 Rf=4700.0 k=3.125 b=1.2499999999999998
R1=2700.0 R2=360.0 Rg=2.4 Rf=680.0 k=3.1246875459491252 b=1.2498162034994855
R1=2700.0 R2=360.0 Rg=200.0 Rf=1100.0 k=3.125 b=1.25
R1=2700.0 R2=360.0 Rg=75000.0 Rf=160000.0 k=3.124336144954702 b=1.2496094970321774
R1=5100.0 R2=680.0 Rg=12.0 Rf=1300.0 k=3.1241830065359477 b=1.2495194156093812
R1=5100.0 R2=680.0 Rg=1800.0 Rf=5100.0 k=3.125 b=1.25
R1=18000.0 R2=2400.0 Rg=12000.0 Rf=30000.0 k=3.125 b=1.25
R1=18000.0 R2=2400.0 Rg=20000.0 Rf=47000.0 k=3.125 b=1.2500000000000002
R1=27000.0 R2=3600.0 Rg=24.0 Rf=6800.0 k=3.124687545949125 b=1.2498162034994853
R1=27000.0 R2=3600.0 Rg=2000.0 Rf=11000.0 k=3.125 b=1.2500000000000002
R1=51000.0 R2=6800.0 Rg=120.0 Rf=13000.0 k=3.1241830065359477 b=1.249519415609381
R1=51000.0 R2=6800.0 Rg=18000.0 Rf=51000.0 k=3.125 b=1.25
R1=120000.0 R2=16000.0 Rg=1.0 Rf=30000.0 k=3.124849489827804 b=1.2499114646045906
R1=120000.0 R2=16000.0 Rg=1.1 Rf=30000.0 k=3.1248344399832177 b=1.2499026117548342
R1=120000.0 R2=16000.0 Rg=1.2 Rf=30000.0 k=3.1248193903518198 b=1.2498937590304824
R1=120000.0 R2=16000.0 Rg=1.3 Rf=30000.0 k=3.1248043409336055 b=1.249884906431533
R1=120000.0 R2=16000.0 Rg=1.5 Rf=30000.0 k=3.1247742427367093 b=1.249867201609829
R1=120000.0 R2=16000.0 Rg=1.6 Rf=30000.0 k=3.124759193958018 b=1.2498583493870694
R1=120000.0 R2=16000.0 Rg=1.8 Rf=30000.0 k=3.1247290970401274 b=1.249840645317722
R1=120000.0 R2=16000.0 Rg=2.0 Rf=30000.0 k=3.124699000974862 b=1.2498229417499187
R1=120000.0 R2=16000.0 Rg=2.2 Rf=30000.0 k=3.124668905762185 b=1.2498052386836385
R1=120000.0 R2=16000.0 Rg=2.4 Rf=30000.0 k=3.124638811402062 b=1.24978753611886
R1=120000.0 R2=16000.0 Rg=2.7 Rf=30000.0 k=3.124593671460333 b=1.2497609832119607
R1=120000.0 R2=16000.0 Rg=3.0 Rf=30000.0 k=3.124548533436645 b=1.2497344314333205
R1=120000.0 R2=16000.0 Rg=3.3 Rf=30000.0 k=3.124503397330874 b=1.2497078807828672
R1=120000.0 R2=16000.0 Rg=3.6 Rf=30000.0 k=3.1244582631428983 b=1.2496813312605286
R1=120000.0 R2=16000.0 Rg=3.9 Rf=30000.0 k=3.124413130872597 b=1.2496547828662332
R1=120000.0 R2=16000.0 Rg=4.3 Rf=30000.0 k=3.1243529574950295 b=1.2496193867617822
R1=120000.0 R2=16000.0 Rg=4.7 Rf=30000.0 k=3.1242927875261524 b=1.2495839926624428
R1=120000.0 R2=16000.0 Rg=5.1 Rf=30000.0 k=3.124232620965676 b=1.2495486005680447
R1=120000.0 R2=16000.0 Rg=5.6 Rf=30000.0 k=3.124157417557702 b=1.2495043632692366
R1=120000.0 R2=16000.0 Rg=6.2 Rf=30000.0 k=3.124067180496565 b=1.2494512826450384
R1=180000.0 R2=24000.0 Rg=120000.0 Rf=300000.0 k=3.125 b=1.25
R1=180000.0 R2=24000.0 Rg=200000.0 Rf=470000.0 k=3.125 b=1.2499999999999998
R1=270000.0 R2=36000.0 Rg=240.0 Rf=68000.0 k=3.1246875459491252 b=1.2498162034994853
R1=270000.0 R2=36000.0 Rg=20000.0 Rf=110000.00000000001 k=3.1250000000000004 b=1.2500000000000004
R1=509999.99999999994 R2=68000.0 Rg=1200.0 Rf=130000.0 k=3.1241830065359486 b=1.2495194156093812
R1=509999.99999999994 R2=68000.0 Rg=180000.0 Rf=509999.99999999994 k=3.125 b=1.2499999999999998
你认为哪些解更好呢？@king5555 @tianxj01
我想了下
1、属于E6更好
2、Rg省略更好
3、对vref输出电阻不敏感越好
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@yurimuki ：双电源下，先通过精密电阻200欧，转换成0-4V ，再加一级BUFF 输出，如果要完成全硬件电路校正，则需要加一级调零及满度校正再输出给MCU,如果全软件校正，则进行软件校正。校零及FULL CAL.
@zyj9490 ：我是将0-20mA转换成0-4V输出，想请问下双电源的话怎么处理
4-20MA 信号是近直流的信号，非交流信号。仿真条件不符合标准。