Description
Although modern integrated circuit operational amplifiers ease linear circuit
design, IC processing limits amplifier output power. Many applications, however,
require substantially greater output voltage swing or current (or both) than IC
amplifiers can deliver. In these situations an output “booster,” or post
amplifier, is required to achieve the needed voltage or current gain. Normally,
this stage is placed within the feedback loop of the operational amplifier so
that the low drift and stable gain characteristics of the amplifier are
retained.
Because the booster is a gain stage with its own inherent AC characteristics,
the issues of phase shift, oscillation, and frequency response cannot be ignored
if the booster and amplifier are to work well together. The design of booster
stages which achieve power gain while maintaining good dynamic performance is a
difficult challenge. The circuitry for boosters will change with the
application’s requirements,which can be very diverse.
This application note explains the following designs with diagrams and
definitions.
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