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LTSpice Experiments with Codes

Experiment 7: Bipolar Transistor Amplifier

*BIPOLAR TRANSISTOR AMPLIFIER
VIN 10 AC10MV SIN(O 10MV 1KHZ)
VCCO 7 DC 15V
RS 12 500
R173 47K
R2 305K
RC 74 10K
RE502K
RL6020K
C123 1UF
C2 4 6 1UF
CE S0 10UF
Q1 4350 QM
.MODEL QM PNP(IS=2E-16 BF=50 BR=1 RB=5 RC=1 RE=0 TF=0.2NS TR=SNS CJE=0.4PF VJE=0.8ME=0.4 CIC=0.5PF VJC=0.8 CCS=1PF VA=100)
.PLOT TRAN V(4) V(6) V(1)
.PLOT AC VM(6) VP(6)
*.OPTIONS NOPAGE NOECHO
TRAN 50US 2MS
.AC DEC10 1HZ 10KHZ
.OP
.PROBE
.END

Experiment 8: Two-Stage Bipolar Transistor Amplifier

*Two-stage BJT amplifier
VCC 10 0 DC 15V
VIN 1 0 AC 1MV
RS 12 2
R1 200K
R2 50K
RC1 10 4
RE1 3.6K
RE2 3.6K
RL 20K
C1 1UF
C2 1UF
CE1 10UF
CE2 25UF
Q1 4 3 5 QM
Q2 7 6 8 QM
.MODEL QM NPN(IS=2E-16 BF=50 BR=1 RB=5 RC=1 RE=0 CJE=0.4PF VJE=0.8 ME=0.4 CJC=0.5PF VJC=0.8 CCS=1PF VA=100)
.AC DEC 10 10HZ 10MHZ
.PLOT AC VM(9) VP(9)
.PROBE
.END

Experiment 9: Diode Clamper Circuit

*diode clamper circuit
Vin 10 sin(0 10 1khz)
C1 12 1uf lc= -15v
R1 20 1Meg
Vdc 30 DC 5v
D1 3 2 Diode
.MODEL Diode D
.tran 20us 2ms UIC
*.op
.plot tran V(2) V(1)
.end

Experiment 10: Darlington Pair

*DARLINGTON PAIR
.OPTIONS NOPAGE NOECHO
VCC 20DC 12V
VIN 10 DC 5V
Q1 2 13 QM
Q2 234 QM
RB 2 1 47K
RE 40 4.7K
.MODEL QM NPN(BF=100 BR=1 RB=5 RC=1 RE=0 VJE=0.8 VA=100)
.TF V(4) VIN
.END

Additional Experiments:

1. Diode Characteristics:

*Diode characteristics
VD 10 DC OV
D1 12 DIN914
VX 20 DC OV
.MODEL D1N914 D (IS=3.93E-9 RS=1 BV=100V IBV=5E-6 CJO=1.7PF TT=2NS)
.DC VD 0 1V 0.05V
.PLOT DC I(VX)
.PROBE
.END

2. Zener Voltage Regulator:

*ZENER VOLTAGE REGULATOR
VIN 10 DC 10V
R1 12 500
D1 2 3 DNAME
D2 0 3 DNAME
RL 2 0 1K
.MODEL DNAME D (IS=0.5UA RS=1 BV=5.20 IBV=0.5UA)
TEMP 50
.DC VIN -15 15V 0.5V
.PRINT DC V(2)
.PROBE
.OP
.END

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