TECHNICAL WORKSHOP MARATHON 2012
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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.

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SIMULATION OF AMPLIFIERS USING NGSPICE

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Simulation of amplifiers using ngspice

TECHNICAL WORKSHOP MARATHON 2012

SIMULATION OF AMPLIFIERS USING NGSPICE

VISHNU V

2nd Year M.Tech VLSI and Embedded Systems

Govt. Model Engineering College, Thrikkakara


Simulation of amplifiers using ngspice

ANALYSIS OF AMPLIFIERS USING NGSPICE

CONSIDER THE AMPLIFIER SHOWN IN FIGURE

2


Simulation of amplifiers using ngspice

MODEL DESCRIPTION OF TRANSISTOR

MODEL NAME

MODEL TYPE

.MODEL GENERICNPN

Q1 C BE GENERIC


Simulation of amplifiers using ngspice

WHAT IS THE NEED OF COUPLING CAPACITORS IN AN AMPLIFIER ???


Simulation of amplifiers using ngspice

NEED OF COUPLING CAPACITORS

C

OUTPUT NODE

B

E


Simulation of amplifiers using ngspice

NEED OF COUPLING CAPACITORS

C

OUTPUT NODE

B

E


Simulation of amplifiers using ngspice

WHAT ARE THE WAVEFORMS AT BASE NODE AND COLLECTOR NODE ???


Simulation of amplifiers using ngspice

NEED OF COUPLING CAPACITORS

WAVEFORM AT BASE NODE AND COLLECTOR NODE

OUTPUT

(COLLECTOR)

INPUT

(BASE)


Simulation of amplifiers using ngspice

NEED OF COUPLING CAPACITORS

WAVEFORM AT BASE NODE AND OUTPUT NODE

INPUT

(BASE)

OUTPUT


Simulation of amplifiers using ngspice

AFTER ADDING INPUT COUPLING CAPACITOR

C

OUTPUT NODE

B

E


Simulation of amplifiers using ngspice

INPUT VOLTAGE


Simulation of amplifiers using ngspice

VOLTAGE AT BASE NODE


Simulation of amplifiers using ngspice

VOLTAGE AT COLLECTOR NODE


Simulation of amplifiers using ngspice

OUTPUT NODE VOLTAGE


Simulation of amplifiers using ngspice

EFFECT OF BYPASS CAPACITOR

BYPASS CAPACITOR


Simulation of amplifiers using ngspice

FREQUENCY RESPONSE PLOT WITH BYPASS CAPACITOR


Simulation of amplifiers using ngspice

FREQUENCY RESPONSE PLOT WITHOUT BYPASS CAPACITOR


Simulation of amplifiers using ngspice

ANALYSE BOTH FREQUENCY RESPONSE PLOTS AND MAKE CONCLUSIONS


Simulation of amplifiers using ngspice

ANALYSIS OF BJT AMPLIFIERS

ANALYSE THE FOLLOWING CIRCUIT USING NGSPICE


Simulation of amplifiers using ngspice

PLOT THE FREQUENCY RESPONSE PLOTS FOR THE CIRCUIT WITH AND WITHOUT Rce RESISTANCE


Simulation of amplifiers using ngspice

DESIGN A COMMON EMITTER AMPLIFIER FOR THE GIVEN SPECIFICATIONS AND PLOT ITS TRANSIENT AND AC RESPONSE USING NGSPICE ??

(Use Circuit in ELECTRONIC CIRCUITS Lab)


Simulation of amplifiers using ngspice

DESIGN COMMON BASE AMPLIFIER AND COMMON COLLECTOR AMPLIFIERFOR THE GIVEN CONFIGURATIONS AND PLOT ITS TRANSIENT AND AC RESPONSE USING NGSPICE AND COMPARE THE OUTPUTS

(Use Circuit in ELECTRONIC CIRCUITS Lab)


Simulation of amplifiers using ngspice

MOS AMPLIFIERS

DIFFERENT TYPES OF MOS AMPLIFIERS

COMMON SOURCE AMPLIFIER

COMMON GATE AMPLIFIER

COMMON DRAIN AMPLIFIER


Simulation of amplifiers using ngspice

MODEL DESCRIPTION OF MOSFET

MODEL TYPE

MODEL NAME

.MODEL MOS1 NMOS

M1 DGS B MOS1 W=22.0U L=0.6U

SCALING PARAMETERS


Simulation of amplifiers using ngspice

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


Simulation of amplifiers using ngspice

COMMON SOURCE AMPLIFIER

PLOT THE TRANSIENT RESPONSE AND FREQUENCY RESPONSE OF THE FOLLOWING AMPLIFIER USING NGSPICE


Simulation of amplifiers using ngspice

OUTPUT WAVEFORMS – TRANSIENT RESPONSE


Simulation of amplifiers using ngspice

FREQUENCY RESPONSE


Simulation of amplifiers using ngspice

FREQUENCY RESPONSE WITHOUT BYPASS(CS) CAPACITOR


Simulation of amplifiers using ngspice

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)


Simulation of amplifiers using ngspice

TRANSFER CHARACTERISTICS


Simulation of amplifiers using ngspice

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


Simulation of amplifiers using ngspice

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