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A J-K flip-flop with J = 1 and K = 1 has a 20 kHz clock input. The Q output is ________

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A J-K flip-flop with J = 1 and K = 1 has a 20 kHz clock input. The Q output is ________

(a) Constantly LOW

(b) Constantly HIGH

(c) A 20 kHz square wave

(d) A 10 kHz square wave

The question was posed to me in my homework.

This is a very interesting question from Flip Flops topic in chapter Flip-Flops of Digital Circuits

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Correct choice is (d) A 10 kHz square wave

To explain I would say: The flip flop is sensitive only to the positive or negative edge of the clock pulse. So, the flip-flop toggles whenever the clock is falling/rising at edge. This triggering of flip-flop during the transition state, is known as Edge-triggered flip-flop. 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.

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