In practice it is often very difficult to build an amplifier at very low frequencies
Chapter 8, Problem 8.49(choose chapter or problem)
In practice it is often very difficult to build an amplifier at very low frequencies. Consequently~ low-frequency amplifiers typically exploit the principles of amplitude modulation to shift the signal into a higher-frequency band. Such an amplifier is referred to as a chopper amplifier and is illustrated in the block-diagram form in Figure P8.49. (a) Determine in terms ofT the highest allowable frequency present in x(t), if y(t) is to be proportional to x(t) (i.e., if the overall system is to be equivalent to an amplifier). (b) With x(t) bandlimited as specified in part (a), determine the gain of the overall system in Figure P8.49 in terms of A and T.
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