Counters - Technical MCQs

Q1:

A 4-bit binary up counter has an input clock frequency of 20 kHz. The frequency of the most significant bit is ________.

A 1.25 kHz

B 2.50 kHz

C 160 kHz

D 320 kHz

ANS:A - 1.25 kHz

As it is a 4 bit up counter, requires 4 Flip Flops.

Each Flip Flop divides the input frequency by 2. ie. f/2, f/4, f/8, f/16.
So Output frequency = input frequency/16,
Output frequency = 20 KHz/16,
Output frequency = 1.25 KHz.