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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TECHNICAL WORKSHOP MARATHON 2012

SIMULATION OF AMPLIFIERS USING NGSPICE

VISHNU V

2nd 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 GENERICNPN

Q1 C BE 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 AMPLIFIERFOR 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 TYPE

MODEL NAME

.MODEL MOS1 NMOS

M1 DGS 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 OF THE FOLLOWING AMPLIFIER USING NGSPICE


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


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