Introduction

In the pass transisitor logic the input to the gate acts as the controlling input and depending on the value of control variable ,the input at the source end of transistor appears at the drain end or in other words the control variable controls a pass transistor network to which pass variables are applied.

PASS TRANSISTOR LOGIC THROUGH NMOS

As we already know NMOS permits flow of current from source to drain when the input to the gate is 1 therefore when control variable is equal to 1 the input at the source end appears on the drain.

PASS TRANSISTOR LOGIC THROUGH PMOS

As we already know PMOS permits flow of current from source to drain when the input to the gate is 0 therefore when control variable is equal to 0 the input at the source end appears on the drain.