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Function Implementation Using CMOS

In the follow...

Question

In the following circuit employing pass transistor logic, all NMOS transistors are identical with a threshold voltage of 1 V. Ignoring the body-effect, the output voltages at P, Q and R are

4 V, 4 V, 4 V

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5 V, 4 V, 3 V

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4 V, 3 V, 2 V

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5 V, 5 V, 5 V

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Solution

The correct option is A 4 V, 4 V, 4 V

As we know that for proper operation
$V_{D S} = V_{G S} - V_{T}$
$V_{D} - V_{S} = V_{G} - V_{S} - V_{T}$
$\Rightarrow$ $V_{D} = V_{G} - V_{T}$
At P
$\Rightarrow$ $V_{D} = V_{G} - V_{T}$
Given $V_{G}$ for all transistor =5 V and
$V_{T}$ for all transistors = 1 V
$∴$ $V_{D} a t P = V_{G} - V_{T} = 5 - 1 = 4 V$
$V_{D} a t Q = V_{G} - V_{T} = 5 - 1 = 4 V$
$V_{D} a t R = V_{G} - V_{T} = 5 - 1 = 4 V$
According to the given options the only condition satisfied for the voltages at P, Q and R is only option (c).

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