Simulation of Amplifier Circuits using NGSPICE

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TECHNICAL WORKSHOP MARATHON 2012

SIMULATION OF AMPLIFIERS USING NGSPICE

VISHNU V

2 nd

Year M.Tech VLSI and Embedded Systems

Govt. Model Engineering College, Thrikkakara

ANALYSIS OF AMPLIFIERS USING NGSPICE

CONSIDER THE AMPLIFIER SHOWN IN FIGURE

2

MODEL DESCRIPTION OF TRANSISTOR

MODEL NAME MODEL TYPE

.MODEL GENERIC NPN

Q1 C B E GENERIC

WHAT IS THE NEED OF

COUPLING CAPACITORS IN AN

AMPLIFIER ???

NEED OF COUPLING CAPACITORS

C

OUTPUT NODE

B

E

NEED OF COUPLING CAPACITORS

C

OUTPUT NODE

B

E

WHAT ARE THE WAVEFORMS AT

BASE NODE AND COLLECTOR

NODE ???

NEED OF COUPLING CAPACITORS

WAVEFORM AT BASE NODE AND COLLECTOR NODE

OUTPUT

(COLLECTOR)

INPUT

(BASE)

NEED OF COUPLING CAPACITORS

WAVEFORM AT BASE NODE AND OUTPUT NODE

INPUT

(BASE)

OUTPUT

AFTER ADDING INPUT COUPLING CAPACITOR

C

OUTPUT NODE

B

E

INPUT VOLTAGE

VOLTAGE AT BASE NODE

VOLTAGE AT COLLECTOR NODE

OUTPUT NODE VOLTAGE

EFFECT OF BYPASS CAPACITOR

BYPASS

CAPACITOR

FREQUENCY RESPONSE PLOT WITH BYPASS CAPACITOR

FREQUENCY RESPONSE PLOT WITHOUT BYPASS CAPACITOR

ANALYSE BOTH FREQUENCY

RESPONSE PLOTS AND

MAKE CONCLUSIONS

ANALYSIS OF BJT AMPLIFIERS

ANALYSE THE FOLLOWING CIRCUIT USING NGSPICE

PLOT THE FREQUENCY RESPONSE

PLOTS FOR THE CIRCUIT WITH AND

WITHOUT

Rce

RESISTANCE

DESIGN A COMMON EMITTER AMPLIFIER FOR

THE GIVEN SPECIFICATIONS AND PLOT ITS

TRANSIENT AND AC RESPONSE USING

NGSPICE ??

(Use Circuit in ELECTRONIC CIRCUITS Lab)

DESIGN

COMMON BASE AMPLIFIER

AND

COMMON COLLECTOR AMPLIFIER

FOR

THE GIVEN CONFIGURATIONS AND PLOT

ITS TRANSIENT AND AC RESPONSE

USING NGSPICE AND COMPARE THE

OUTPUTS

(Use Circuit in ELECTRONIC CIRCUITS

Lab)

MOS AMPLIFIERS

DIFFERENT TYPES OF MOS AMPLIFIERS

COMMON SOURCE AMPLIFIER

COMMON GATE AMPLIFIER

COMMON DRAIN AMPLIFIER

MODEL DESCRIPTION OF MOSFET

MODEL NAME

MODEL TYPE

.MODEL MOS1 NMOS

M1 D G S B MOS1 W=22.0U L=0.6U

SCALING PARAMETERS

MODEL DESCRIPTION OF MOSFET CONSIDERING ALL THE

PARAMETERS

.MODEL MOS1 NMOS VTO=0.7 GAMMA=0.5

LAMBDA=0.1 PHI=0.8 CGBO=0.38E-9 CGDO=0.4E-9

CGSO=0.4E-9 CJ=0.57E-3 CJSW=0.12E-9 TOX=9.5E-9

UO=460 LD=0.08E-6 JS=10E-9 MJ=0.5 MJSW=0.4

PB = 0.9

COMMON SOURCE AMPLIFIER

PLOT THE

TRANSIENT RESPONSE

AND

FREQUENCY RESPONSE

FOLLOWING AMPLIFIER USING NGSPICE

OF THE

OUTPUT WAVEFORMS – TRANSIENT RESPONSE

FREQUENCY RESPONSE

FREQUENCY RESPONSE WITHOUT BYPASS(CS) CAPACITOR

DC ANALYSIS CONTROL LINE O/P CHARACTERISTICS OF MOSFET

DC VDS 0 5 0.2 VGS 1 4 1

PLOT -vds#branch vs V(2)

TRANSFER CHARACTERISTICS

LAB

SESSION

EXPERIMENTS

LOW PASS AND HIGH PASS FREQUENCY RESPONSE

DC ANALYSIS OF CE, CB and CC CONFIGURATIONS

PLOT TRANSIENT AND FREQUENCY RESPONE OF

CE, CB and CC AMPLIFIERS

CS, CG and CD AMPLIFIERS

EXPERIMENTS IN ELECTRONIC CIRCUITS LAB RECORD

33

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