Analog Electronics - GATE practice papers - Electronics & Communication for Q. 517

Q.  What will  be the value of largest MOD ripple counter that can be implemented in order to operate upto 16 MHz  using J-K flipflops with tnd = 10 ns?
(Marks : 02)
- Published on 19 Oct 15

a. 8
b. 10
c. 32
d. 64

ANSWER: 64
 
According to the given data,

tnd = 10 ns & f = 16 MHz
Assume that 'n' number of flipflops are connected . Hence, the frequency can be expressed as,
f = 1 / n. td
16 x 106 = 1 / (n x 10 x 10 -9 )

n = 1 / 16 x 106 x 10 x 10-9
= 1 / 16 x 10-2
n = 6.25 ≈ 6
Thus, number of flipflops = 6
Number of MOD ripple counters = 2n = (2) 6 = 64

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