Operational amplifiers (op-amps) are typically operated with negative feedback in analog applications. While negative feedback generally has positive effects on circuit characteristics, the unavoidable phase shift in the feedback path can lead to instability. However, these instabilities can be avoided through appropriate measures.

Op-Amp Stability and Frequency Effects

Stability issues in analog circuits are becoming less prominent due to the increasing prevalence of digital electronics. While digital circuits inherently have only two output states, analog circuits are based on linearity between input and output signals. This linearity in analog circuits is achieved through the use of negative feedback. However, the negative feedback of an operational amplifier works less effectively as the frequency of the signal increases, since capacitive loads within the feedback loop and in the op-amp itself introduce destabilizing phase delays due to their low-pass behavior. In the best...