Description

Operational amplifiers (op amps) are often used to drive devices that have significant input capacitance such as analog-to-digital converters, cables, MOSFETs, filter networks, etc. The effect of the capacitance is extra phase shift in the loop gain of the amplifier. This phase shift erodes the phase margin of the amplifier and may lead to instability. At high frequency, even a very small capacitance is detrimental.

This paper reports a simple method for restoring amplifier stability while driving capacitive loads with the THS4001.