Patent ID: 8866551

Claim:
A circuit for use with an operational amplifier in an environment that experiences fluctuations in ambient energy levels, the operational amplifier including a first input terminal that accepts a first input signal, the first input terminal associated with a first input impedance, a second input terminal that accepts a second input signal, the second input terminal associated with a second input impedance, an output terminal that produces an output signal based on the first and the second input signals, and internal components that generate an input offset voltage and an input bias current, the circuit comprising: a compensation impedance stage electrically coupled to at least one of the first input terminal and the second input terminal, the compensation impedance stage having a compensation impedance that is selected proportional to a ratio of a change in the input offset voltage and a change in the input bias current, the compensation impedance compensates for environmentally-induced changes in both the input offset voltage and the input bias current.