Capacitive feedback to boost amplifier slew rate

摘要

An integrated circuit voltage follower buffer amplifier is provided with a feedback capacitor that is coupled to produce positive feedback current that acts to enhance slew rate. In an op amp a polarity sensitive slew rate enhancement acts to correct slew rate asymmetry. Circuits are shown for avoiding assymetry or boosting slew rate of both polarities. In all cases, the positive feedback current is made proportional to the rate of change of the output voltage.