Real-world applications must deal with an ever increasing amount of radio frequency interference (RFI). Of particular concern are situations in which signal transmission lines are long and signal strength is low. This is the classic application for an in-amp, since its inherent common-mode rejection allows the device to extract weak differential signals riding on strong common-mode noise and interference. One potential problem that is frequently overlooked, however, is that of radio frequency rectification inside the in-amp. When strong RF interference is present, it may become rectified by the internal junctions of the IC and then appear as a dc output offset error.
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