8

Power supplies and PSRR

Power supply technologies

There are three principal ways to power an amplifier:

1  a simple unregulated power supply consisting of transformer, rectifiers, and reservoir capacitors;

2  a linear regulated power supply;

3  a switch-mode power supply.

It is immediately obvious that the first and simplest option will be the most cost-effective, but at a first glance it seems likely to compromise noise and ripple performance, and possibly interchannel crosstalk. It is therefore worthwhile to examine the pros and cons of each technology in a little more detail.

Simple unregulated power supplies

Advantages

images  Simple, reliable, ...

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