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EE 3110: Common-Emitter Amplifier Characteristics at University of Utah - Prof. R. R. Harr, Assignments of Electrical and Electronics Engineering

University of Utah (The U)Electrical and Electronics Engineering
Prof. R. R. Harrison

An assignment for students in the electrical and computer engineering department at the university of utah, focusing on spice simulation techniques for a common-emitter bipolar voltage amplifier. The assignment aims to prepare students for lab 2 by simulating the circuit's dc operating point, finding the highest input voltage without distortion, observing the frequency response, and creating a matlab bode plot.

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Uploaded on 08/30/2009

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UNIVERSITY OF UTAH
ELECTRICAL AND COMPUTER ENGINEERING DEPARTMENT
EE 3110 SPICE ASSIGNMENT #1
COMMON-EMITTER AMPLIFIER CHARACTERISTICS
Assignment
The purpose of this assignment is to learn SPICE simulation techniques, but more
importantly to prepare you for Lab 2. The values from this assignment will be compared
to the measurements in Lab 2. You should complete the simulations before attempting
the lab measurements. This will help you know what to look for and expect in Lab 2.
Hopefully this will make your time in lab more efficient and allow you to learn more.
Create a .cir file for the following circuit. The model for the transistor is available on the
class website. Number your nodes as indicated to maintain consistency with the rest of
the class. This will make it easier to help you if you have questions.
Fig. 1. Single stage common-emitter bipolar voltage amplifier.
1. Set VCC = +10 Volts and simulate the DC operating point. The DC node
voltages and transistor currents will be output to the .out file if you specify .OP in
your input file. Report the node voltages of the base, collector, and emitter.
2. Apply a transient sinusoidal source at 10kHz to the input. Run a transient
simulation and find the highest input voltage that doesn’t give visible distortion
1
pf2

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UNIVERSITY OF UTAH

ELECTRICAL AND COMPUTER ENGINEERING DEPARTMENT

EE 3110 SPICE ASSIGNMENT

COMMON-EMITTER AMPLIFIER CHARACTERISTICS

Assignment

The purpose of this assignment is to learn SPICE simulation techniques, but more importantly to prepare you for Lab 2. The values from this assignment will be compared to the measurements in Lab 2. You should complete the simulations before attempting the lab measurements. This will help you know what to look for and expect in Lab 2. Hopefully this will make your time in lab more efficient and allow you to learn more.

Create a .cir file for the following circuit. The model for the transistor is available on the class website. Number your nodes as indicated to maintain consistency with the rest of the class. This will make it easier to help you if you have questions.

Fig. 1. Single stage common-emitter bipolar voltage amplifier.

  1. Set VCC = +10 Volts and simulate the DC operating point. The DC node voltages and transistor currents will be output to the .out file if you specify .OP in your input file. Report the node voltages of the base, collector, and emitter.
  2. Apply a transient sinusoidal source at 10kHz to the input. Run a transient simulation and find the highest input voltage that doesn’t give visible distortion

on the output. This should be really small, probably around 15mV or so. This number doesn’t need to be reported, just keep it in mind for Lab 2. Using the same simulation, report the gain at this frequency.

  1. Next, apply a 1 Volt AC source to the circuit and run an AC simulation to observe the frequency response (transfer function). Verify that the simulation works by plotting the output. Does the phase make sense for an inverting amplifier?

Once the simulation is working, set up your input file so that the AC data points get printed to your .out file. Using the data copied from your .out file (you may want to play around with the number of points per decade to make the number of points more manageable), create a MATLAB m-file to plot the data as a bode plot (magnitude in dB and phase in degrees). If you wish, you can simply edit out the text header and footer in the .out file, leaving only the data in columns. This file may be loaded into MATLAB directly as an array. The reason for using MATLAB is so that the SPICE simulation can be plotted with the measurements from Lab 2. Using either the SPICE plot or the MATLAB plot, find and report the high and low corner frequencies in Hz.

What to turn in

  1. Your SPICE input file(s).
  2. Report the DC voltage of the base, collector, and emitter.
  3. Report the gain from the transient simulation.
  4. Your MATLAB Bode plot, with appropriate labels and units. Make sure your phase starts at 0 degrees and decreases. Add or subtract 180 degrees to the phase data if it doesn’t. Report your midband gain, and both 3-dB corner frequencies.