Question

9.38 Consider the circuit of Fig. 9.20 with Cc replaced a short circuit. Draw the magnitude Bode plot of the gain over the low- to midband-frequency range if 100. Figure 9.20 BJT circuit containing high- and low-frequency capacitors. VCC +12 V out 01 CL= 14 pF L F Source Amplifier Load (oscilloscope input)

Answer 1

Construct the circuit in PSPICE and enter the corresponding values of each component as shown in figure. STS ci Provide the simulation settings as shown in Figure. Simulation Settings - bias Configuration Files Options Data Colection Probe Window General Analysis Analysis type AC Sweep/Nose AC Sweep Type Linear Logarithmic Decade Options General Settings Monte Carlo Worst Case Parametric Sweep Temperature (Sweep) Seve Blas Point Load Bas Point Start Frequency: 1 End Frequency: 100 Total Points: 100 Noise Analysis Enabled Output Voltage: IN Source: Interval: Output File Options OK Cancel Rooly

After simulating the PSPICE circuit, left click on the trace option then click add trace and type 20*log10(V(R2:2)/(V(R1:1)) command in trace expression box to obtain the bode magnitude plot. Add Traces Simulation Output Variables Functions or Macros Analog Operators and Functions Frequency (C1:1) ( 3) Analog Digital Voltages Currents Power Noise (VH) Allas Names KOL: ABS ARCTANC) ATAN) AVGE) AVGX) COS() [R2:1) (R3) (R3:1) Sub circuit Nodes DO ENVMAX) ENVMINE) NRA) 4:1) EXPE) GO) IMGED Irvi) [VI:) [2) [V2:+) IBQI) 11) Ful List 86 variables listed LOGO LOG100) MAX) MC) Trace Expression: 20-log10[VR 2.27VR1:17 OK Cancel Help Hence, the plot has been obtained.