NMOS Pass Transistor - tu-sofia.bg · 1 Transmission Gate Logic Circuits Adapted from CMOS Logic...

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Transmission GateLogic Circuits

Adapted from CMOS Logic Circuit Design by John P. Uyemura, 2002

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NMOS Pass Transistor

V max=V DD�V Tn

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PMOS Pass Transistor

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CMOS Transmission Gate (TG)

X

X

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TG 2:1 Multiplexor

f =P0.S�P

1. �S

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TG 4:1 Multiplexor

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XOR and XNOR Gates

f =A . �B��A . B f =A .B��A . �B

f =P0.S�P

1. �S

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Alternative XOR / XNOR Circuits

Operation of the Alternative TG XOR Circuit

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TG Adder - Equations

sn=an xor bn xor cn=�an xor b� . �cn��an xor bn� . cn

cn�1=an . bn�cn�an xor bn�=�an xor bn� . cn��an xor bn� . an

a xor b .a=�a.b��a .�b�a=a.b

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TG Adder

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TG-based Latch

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TG-based M/S Flip-Flop

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SN74HC74

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