Chapter 15Sampling Theory and Sampling Mixers

After showing a whole host of equations from the last two chapters, I will try a graphical approach to the subject of sampling. However, some equations will have to be shown.

The objectives of this chapter will be the following:

1. To show what sampling is in terms of multiplying a signal

2. To show how sampling can be used for mixing, such as generating an intermediate-frequency (IF) signal

3. To investigate switch-mode mixers

Sampling Signals as a Form of Muliplication or Mixing

A typical sampling circuit is a switch that is turned on for a short duration that momentarily passes an input signal to the output terminal of the switch (Figure 15-1A). In Figure 15-1A, an input signal such as a direct-current ...

Get Build Your Own Transistor Radios now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.