VLSI Practical
Practical
no:4
Aim
:- Plot the transient characteristics of CMOS NOR gate.
Tools
:- Tanner T-spice
Circuit
Diagram:-
Figure is shows circuit
diagram of CMOS NOR gate
Coding: -
.model nMOS1 nMOS Vth=0.7v Kn=110u gamma=0.4 lambda=0.04 phi=0.7
.model nMOS2 nMOS Vth=0.7v Kn=110u gamma=0.4 lambda=0.04 phi=0.7
.model pMOS1 pMOS Vth=0.7v Kn=50u gamma=0.57 lambda=0.05 phi=0.8
.model pMOS2 pMOS Vth=0.7v Kn=50u gamma=0.57 lambda=0.05 phi=0.8
Waveforms:-
M1 4 1 5 5 pMOS1 W=3u L=1u
M2 3 2 4 5 pMOS2 W=3u L=1u
M3 3 1 0 0 nMOS1 W=1u L=1u
M4 3 2 0 0 nMOS2 W=1u L=1u
Vdd 5 0 5v
vin1 1 0 dc 0 pulse(0 5 0 1n 1n 10n 20n)round=0 ac=0 0
vin2 2 0 dc 0 pulse(0 5 0 1n 1n 30n 40n)round=0 ac=0 0
.tran 10n 100n
.print tran v(1),v(2),v(3)
. end
Observations:-
Device and node counts:-
MOSFETs - 4 MOSFET geometries - 4
BJTs - 0 JFETs - 0
MESFETs - 0 Diodes - 0
Capacitors - 0 Resistors - 0
Inductors - 0 Mutual inductors - 0
Transmission lines - 0 Coupled transmission lines - 0
Voltage sources - 3 Current sources - 0
VCVS - 0 VCCS - 0
CCVS - 0 CCCS - 0
V-control switch - 0 I-control switch - 0
Macro devices - 0 Functional model instances - 0
Subcircuits - 0 Subcircuit instances - 0
Independent nodes - 2 Boundary nodes - 4
Total nodes - 6
Time:-
Parsing
0.00 seconds
Setup
0.00 seconds
DC operating point
0.00 seconds
Transient Analysis 0.00 seconds
--------------------------------------------------
Total
0.00 seconds
Input waveform of CMOS NOR
circuit which is apply at terminal V(1)
Input waveform of CMOS NOR
circuit which is apply at terminal V(2)
Output waveform
of CMOS NOR circuit which is taken from terminal V(3)
Conclusion:
-
