## Chapter 6

## Q. 6.2

## Step-by-Step

## Verified Solution

Using Nyquist’s sampling theorem (Equation 1), we have

f_{s} ≥ 2f_{a} (1)

therefore, f_{s} ≥ 8 kHz

If a 5-kHz audio frequency entered the sample-and-hold circuit, the output spectrum shown in Figure 7 is produced. It can be seen that the 5-kHz signal produces an alias frequency of 3 kHz that has been introduced into the original audio spectrum.