GATE EE 2014 Set 3 — Question 59
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Analog & Digital Electronics → Digital Logic Circuits
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Question
Two monoshot multivibrators, one positive edge triggered () and another negative edge triggered (), are connected as shown in figure. The monoshots and when triggered produce pulses of width and respectively, where . The steady state output voltage of the circuit is
Correct answer
(C) [figure]
Solution
In the given circuit, is positive edge triggered and is negative edge triggered. is triggered by the output of the AND gate, which depends on the feedback from . When is low (steady state initially), is high, allowing to be triggered. Once is triggered, stays high for . The falling edge of (after ) triggers . then produces a pulse of width . During this interval , is high and is low, which inhibits from re-triggering. After expires, returns to low, goes high, and the cycle repeats. Since the output is taken from , it will be high for duration and low for duration . This corresponds to the waveform in option (C).
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