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直流耦合仪表和差分放大器
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2009-06-06
王毅山
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The need to glean AC signals from DC in the presence of
common-mode noise frequently occurs in signal conditioning
applications. AC coupling to an instrumentation amplifier
(IA) or difference amplifier can be used to accurately
extract the AC signal while rejecting DC and common-mode
noise.
Adding capacitors and resistors to AC couple the inputs of
an instrumentation amplifier or difference amplifier seems
like an obvious approach for AC coupling, but it has problems.
The DC restoration circuits shown in this bulletin have
the same transfer function but without the foibles.
common-mode noise frequently occurs in signal conditioning
applications. AC coupling to an instrumentation amplifier
(IA) or difference amplifier can be used to accurately
extract the AC signal while rejecting DC and common-mode
noise.
Adding capacitors and resistors to AC couple the inputs of
an instrumentation amplifier or difference amplifier seems
like an obvious approach for AC coupling, but it has problems.
The DC restoration circuits shown in this bulletin have
the same transfer function but without the foibles.
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