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A DC voltage or current in a circuit to set the operation point of an active or non-linear component.
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When should I put a biasing resistor - op-amps
If you are using a JFET input op-amp the input bias is so low that for most purposes it can be ignored. … Even with bipolar types the bias current is low, on a LM324 it is 50nA max, so if the resistance at a pin was 10K the voltage developed would be 0.5mV. …