Transmission gate
7
description
introduction
Transcript of Transmission gate
1
Transmission GateLogic Circuits
Adapted from CMOS Logic Circuit Design by John P. Uyemura, 2002
2
NMOS Pass Transistor
V max=V DD�V Tn
3
PMOS Pass Transistor
4
CMOS Transmission Gate (TG)
X
X
5
TG 2:1 Multiplexor
f =P0.S�P
1. �S
6
TG 4:1 Multiplexor
Click to add text
7
XOR and XNOR Gates
f =A . �B��A . B f =A .B��A . �B
f =P0.S�P
1. �S
8
Alternative XOR / XNOR Circuits
Operation of the Alternative TG XOR Circuit
9
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
10
TG Adder
11
TG-based Latch
12
TG-based M/S Flip-Flop
13
14
SN74HC74
