AN2653 Datasheet, PDF (1/22 Pages) STMicroelectronics – Operational amplifier stability compensation methods

AN2653
Application note
Operational amplifier stability compensation methods
for capacitive loading applied to TS507
Introduction
Who has never experienced oscillations issues when using an operational amplifier? Op-
amps are often used in a simple voltage follower configuration. However, this is not the best
configuration in terms of capacitive loading and potential risk of oscillations.
Capacitive loads have a big impact on the stability of operational amplifier-based
applications. Several compensation methods exist to stabilize a standard op-amp. This
application note describes the most common ones, which can be used in most cases.
The general theory of each compensation method is explained, and based on this, specific
data is provided for the TS507. The TS507 is a high precision rail-to-rail amplifier, with very
low input offset voltage, and a 1.9 MHz gain bandwidth product, which is available in
SOT23-5 and SO-8 packages.
This document simplifies the task of designing an application that includes the TS507. It
spares you the time-consuming effort of trying numerous combinations on bench, and it is
also much more accurate than using Spice models which are not designed to study system
stability, even though they can give a general trend.
November 2007
Rev 1
1/22
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