# PSpice Textual Description

Here are some example of circuits simulation based on PSPICE SIMULATION TOOL

1:Simulation of Output characteristics of NPN BJT in common configuration.

PSPICE coding:

*output characteristics of NPN BJT in CE configuration

IB 0 1 DC 1mA

VCE 2 0 DC 12V

Q1 2 1 0 Q2N2222A

.MODEL Q2N2222A NPN (IS=2.105E-16 BF=173 VA=83.3V CJE=29.6PF CJC=19.4PF TF=489.88PS TR=4.9NS)

.DC VCE 0V 10V 0.02V IB 0A 1mA 200U

.PROBE

.OP

.END

GRAPHICAL ANALYZER:

CONCLUSION:

* From above graph we concluded that in the saturation region  the change in base current IB does not produced any change in collecter current.

*In the cutoff region small amount of collecter current flows when IB=0. Basicaly  this is leakage current.

*In active region for small values of base current IB the effect of collecter voltage VCE over collecter current IC is small and for large value of base current its effect increases.

2: Study of transient and frequency response of PNP BJT AMPLIFIER in CE  configuration.

PSPICE CODING:

*study of frequency n transient response of CE configuration PNP BJT amplifier

.TRAN/OP 50US 2MS

*.AC DEC 10 1HZ 10KHZ

.OP

VIN 1 0 AC 10MV SIN(0MV 10MV 1KHZ)

VCC 0 7 DC 15V

RS 1 2 500

R1 7 3 47K

R2 3 0 5K

RC 7 4 10K

RE 5 0 2K

RL 6 0 20K

C1 2 3 10UF

C2 4 6 10UF

CE 5 0 10UF

Q1 4 3 5 0 QM

.MODEL QM PNP(IS=2E-16 BF=50 BR=1 RB=5)

.PLOT TRAN V(4) V(6) V(1

.PLOT AC VM(6) VP(6)

.PROBE

.END

GRAPHICAL ANALYZER FOR TRANSIENT RESPONSE:

GRAPHICAL ANALYZER FOR FREQENCY RESPONSE:

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