Phase compensation counteracts op-amp input capacitance. (bode plot analysis adds compensation capacitors to counteract poles and zeros caused by op amp input capacitance) (Tutorial)

EDN | January 6, 1994| | Copyright

Although op amps are mature devices, many designers often ignore the effects of input capacitance on frequency stability. A bode plot analysis lets you add compensation capacitors to counteract poles and zeros caused by an op amp's input capacitance.

An op amp's input capacitance can often be the bugaboo that prevents the frequency stability of a circuit. The reason is that input capacitance along with the resistive feedback network creates a pole in an inverting amplifier that introduces phase lag in the open-loop response. In noninverting op amps, the input ...

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