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 ...