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Q1:

A sequential multiplexer is connected as shown in figure. Each time the multiplexer receives the clock, it switches to the next channel from 6 to 1. If the input signals are :
A = 10 cos 2p(4 x 103t)
B = 15 cos 2p(5 x 103t)
C = 20 cos 2p(6 x 103t)
D = 10 cos 2p(10 x 103t)
The minimum clock frequency should be __________ kHz.

A 8 kHz

B 50 kHz

C 20 kHz

D 10 kHz

ANS:C - 20 kHz

Minimum clock freq. = 2fm Where fm is highest freq. component = 2 x 10 kHz = 10 kHz.



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