Digital Electronics - Flip-Flops - Discussion
Discussion Forum : Flip-Flops - General Questions (Q.No. 27)
27.
A J-K flip-flop with J = 1 and K = 1 has a 20 kHz clock input. The Q output is ________.
Discussion:
25 comments Page 1 of 3.
Prince said:
1 decade ago
J K flip flop o/p toggles if input is 1,1
Samiksha said:
1 decade ago
How the output will be changed from 20kHz to 10kHz, please explain ?
Jay said:
1 decade ago
@samiksha: because the flip flop is sensitive only to the positive or negative edge of the clock pulse....so the flip-flop toggles whenever the clock's falling/rising edge...thus the output curve has a time period twice that of the clock....frequency is inversely related to time period...and hence frequency gets halved.....got it??
Nitin said:
1 decade ago
Thanks jay.
Yumnam Tamphasana said:
1 decade ago
Good job Jay.
Venkat said:
1 decade ago
Thanks jay, good explanation.
Satyapriya said:
1 decade ago
As one flip flop is used so there is 2 states available.so 20/2=10hz frequency avail; able at the output. Am i right or wrong please someone replay.
Tulasiram said:
1 decade ago
What will be the output for j=1, k=0; j=0, k=1?
Neetu said:
1 decade ago
@Tulasiram:
j= 0,k=0------->previous o/p.
j= 0,k=1--------->0.
j=1 ,k=0---------->1.
j= 1,k=1---------->toggle.
j= 0,k=0------->previous o/p.
j= 0,k=1--------->0.
j=1 ,k=0---------->1.
j= 1,k=1---------->toggle.
Stuaan said:
1 decade ago
@Satyapriya is rightly said when the j-k flip flop has two internal flip flop one is master and another one is slave so the output frequency can be achieve half frequency of the input.
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