Combinational circuits 1.1

Ask

DE.3) The output frequency of a frequency division circuit that contains 12 flip-flops with an input clock frequency of 20.48 MHz is

(a) 10.24 kHz

(b) 5 kHz

(c) 30.24 kHz

(d) 15 kHz

Answer is (b)

Concept

Output frequency = $\frac{input frequency}{(2^{n})}$ where n is the number of flip flops.

Thus fout$f_{out} = \frac{20.48MHz}{2^{12}}$

             = 20.48MHz/4096

             = 5 KHz