Analog Devices, Inc.
SLEW RATE IMPROVEMENT IN MULTISTAGE DIFFERENTIAL AMPLIFIERS FOR FAST TRANSIENT RESPONSE LINEAR REGULATOR APPLICATIONS

Abstract:

An electronic circuit comprises an error amplifier and an overshoot and undershoot detection circuit. The error amplifier has an output stage including a differential input to single ended output amplifier that includes a frequency compensation resistor. A switch circuit is connected across the frequency compensation resistor that shunts the frequency compensation resistor when activated. The overshoot and undershoot detection circuit compares differential input nodes of the output amplifier to a baseline voltage signal and activates the switch circuit when detecting an overshoot condition or an undershoot condition using the baseline voltage signal.