大家好！
这是摘自一篇讲述Rail-to rail放大器**的部分句子：
The choice of ground reference depends on the type of signals processed and
the amplifier characteristics. For example, choosing the negative rail as the ground
reference may optimize the dynamic range of an op amp whose output is designed
to swing to 0V. On the other hand, the signal may require level shifting in order to
be compatible with the input of other devices (such as ADCs) that are not designed
to operate at 0V input.
下划线部分的句子该怎样理解呢？"level shifting"是电平位移吗？怎么理解呢？
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