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Analogue circuit design for RF immunity
Why bother with immunity design for analogue?
The biggest problem for most analogue ICs is their susceptibility to demodulating and intermodulating radio frequency noises that are outside their linear frequency range of operation. Unfortunately there are no data sheet specifications which can act as a predictor of this problem. As a general rule, bipolar opamps are approximately 20dB less immune than BiFET types .
Some opamps are now available ‘hardened’ against RF noise, such as the LMV831 series, but even their circuits might still need to employ the good EMC design techniques described below. This article assumes the use of more traditional, ‘normal’ opamps.
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