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SIMULATION OF AMPLIFIERS USING NGSPICE
VISHNU V
2nd Year M.Tech VLSI and Embedded Systems
Govt. Model Engineering College, Thrikkakara
TECHNICAL WORKSHOP MARATHON 2012
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ANALYSIS OF AMPLIFIERS USING NGSPICE
2
CONSIDER THE AMPLIFIER SHOWN IN FIGURE
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MODEL DESCRIPTION OF TRANSISTOR
.MODEL GENERIC NPN
Q1 C B E GENERIC
MODEL TYPEMODEL NAME
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WHAT IS THE NEED OF COUPLING CAPACITORS IN AN AMPLIFIER ???
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NEED OF COUPLING CAPACITORS
B
C
E
OUTPUT NODE
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NEED OF COUPLING CAPACITORS
B
C
E
OUTPUT NODE
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WHAT ARE THE WAVEFORMS AT BASE NODE AND COLLECTOR NODE ???
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NEED OF COUPLING CAPACITORS
WAVEFORM AT BASE NODE AND COLLECTOR NODE
OUTPUT(COLLECTOR)
INPUT(BASE)
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NEED OF COUPLING CAPACITORS
WAVEFORM AT BASE NODE AND OUTPUT NODE
OUTPUT
INPUT(BASE)
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AFTER ADDING INPUT COUPLING CAPACITOR
B
C
E
OUTPUT NODE
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INPUT VOLTAGE
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VOLTAGE AT BASE NODE
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VOLTAGE AT COLLECTOR NODE
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OUTPUT NODE VOLTAGE
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EFFECT OF BYPASS CAPACITOR
BYPASS CAPACITOR
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FREQUENCY RESPONSE PLOT WITH BYPASS CAPACITOR
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FREQUENCY RESPONSE PLOT WITHOUT BYPASS CAPACITOR
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ANALYSE BOTH FREQUENCY RESPONSE PLOTS AND MAKE CONCLUSIONS
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ANALYSIS OF BJT AMPLIFIERS
ANALYSE THE FOLLOWING CIRCUIT USING NGSPICE
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PLOT THE FREQUENCY RESPONSE PLOTS FOR THE CIRCUIT WITH AND WITHOUT Rce RESISTANCE
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DESIGN A COMMON EMITTER AMPLIFIER FOR THE GIVEN SPECIFICATIONS AND PLOT ITS TRANSIENT AND AC RESPONSE USING NGSPICE ??
(Use Circuit in ELECTRONIC CIRCUITS Lab)
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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)
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MOS AMPLIFIERS
DIFFERENT TYPES OF MOS AMPLIFIERS
COMMON SOURCE AMPLIFIER
COMMON GATE AMPLIFIER
COMMON DRAIN AMPLIFIER
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MODEL DESCRIPTION OF MOSFET
.MODEL MOS1 NMOS
M1 D G S B MOS1 W=22.0U L=0.6U
MODEL NAME MODEL TYPE
SCALING PARAMETERS
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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
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COMMON SOURCE AMPLIFIER
PLOT THE TRANSIENT RESPONSE AND FREQUENCY RESPONSE OF THE FOLLOWING AMPLIFIER USING NGSPICE
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OUTPUT WAVEFORMS – TRANSIENT RESPONSE
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FREQUENCY RESPONSE
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FREQUENCY RESPONSE WITHOUT BYPASS(CS) CAPACITOR
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DC ANALYSIS CONTROL LINE O/P CHARACTERISTICS OF MOSFET
DC VDS 0 5 0.2 VGS 1 4 1PLOT -vds#branch vs V(2)
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TRANSFER CHARACTERISTICS
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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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