In the following circuit,what are P and Q? | vedclass

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(A) The circuit consists of two cross-coupled $NOR$ gates forming an $SR$ latch.For a $NOR$ gate,the output $Y = \overline{A+B}$.Let the top gate be G

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$P=0, Q=1$

Vedclass · Answer

(A) The circuit consists of two cross-coupled $NOR$ gates forming an $SR$ latch.For a $NOR$ gate,the output $Y = \overline{A+B}$.Let the top gate be Gate $1$ and the bottom gate be Gate $2$.The inputs to Gate $1$ are $1$ and $Q$. Thus,$P = \overline{1+Q} = 0$.The inputs to Gate $2$ are $0$ and $P$. Thus,$Q = \overline{0+P}$.Substituting $P=0$ into the equation for $Q$,we get $Q = \overline{0+0} = \overline{0} = 1$.Therefore,$P=0$ and $Q=1$.

In the following circuit,what are $P$ and $Q$?

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