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NMOS Pass Transistor - tu-sofia.bg · 1 Transmission Gate Logic Circuits Adapted from CMOS Logic Circuit Design by John P. Uyemura, 2002 2 NMOS Pass Transistor Vmax=VDD VTn

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Page 1: NMOS Pass Transistor - tu-sofia.bg · 1 Transmission Gate Logic Circuits Adapted from CMOS Logic Circuit Design by John P. Uyemura, 2002 2 NMOS Pass Transistor Vmax=VDD VTn

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

Page 2: NMOS Pass Transistor - tu-sofia.bg · 1 Transmission Gate Logic Circuits Adapted from CMOS Logic Circuit Design by John P. Uyemura, 2002 2 NMOS Pass Transistor Vmax=VDD VTn

3

PMOS Pass Transistor

4

CMOS Transmission Gate (TG)

X

X

Page 3: NMOS Pass Transistor - tu-sofia.bg · 1 Transmission Gate Logic Circuits Adapted from CMOS Logic Circuit Design by John P. Uyemura, 2002 2 NMOS Pass Transistor Vmax=VDD VTn

5

TG 2:1 Multiplexor

f =P0.S�P

1. �S

6

TG 4:1 Multiplexor

Click to add text

Page 4: NMOS Pass Transistor - tu-sofia.bg · 1 Transmission Gate Logic Circuits Adapted from CMOS Logic Circuit Design by John P. Uyemura, 2002 2 NMOS Pass Transistor Vmax=VDD VTn

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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

Page 5: NMOS Pass Transistor - tu-sofia.bg · 1 Transmission Gate Logic Circuits Adapted from CMOS Logic Circuit Design by John P. Uyemura, 2002 2 NMOS Pass Transistor Vmax=VDD VTn

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

Page 6: NMOS Pass Transistor - tu-sofia.bg · 1 Transmission Gate Logic Circuits Adapted from CMOS Logic Circuit Design by John P. Uyemura, 2002 2 NMOS Pass Transistor Vmax=VDD VTn

11

TG-based Latch

12

TG-based M/S Flip-Flop

Page 7: NMOS Pass Transistor - tu-sofia.bg · 1 Transmission Gate Logic Circuits Adapted from CMOS Logic Circuit Design by John P. Uyemura, 2002 2 NMOS Pass Transistor Vmax=VDD VTn

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14

SN74HC74

Lecture 14 Comppy glementary Pass Transistor Logic

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