CHAPTER 9

Power Supplies and PSRR

 

 

‘… my power is made perfect…’

2 Corinthians 12:9

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 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. I am here dealing only with the main supply for the actual power amplifier rails. Many amplifiers now have some ...

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