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Engineering Electronics II Lab 2: Common Source Amplifier Frequency Response, Lab Reports of Electrical and Electronics Engineering

University of Utah (The U)Electrical and Electronics Engineering

The procedures for lab 2 of engineering electronics ii, fall 2007, focusing on the common source amplifier frequency response using spice simulation. Students are required to create a .cir file, run dc, transient, and ac simulations, and analyze the results using matlab to plot the bode plot and find the high and low corner frequencies.

Typology: Lab Reports

Pre 2010

Uploaded on 08/30/2009

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ECE 3110: Engineering Electronics II Fall 2007
Laboratory 2: Common Source Amplifier Frequency Response
(Spice Component)
Due Week 6 (Sept. 24-28)
1 Introduction
The purpose of this assignment is to learn SPICE simulation techniques, but more impor-
tantly 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 expect in Lab 2. This will make your time
in lab more efficient and allow you to learn more.
2 Procedure
Create a .cir file for the circuit shown in Fig. 1. 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, and make it easier to help you if you have questions. Now run the following
simulations:
Figure 1: Common source amplifier schematic.
1
pf2

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ECE 3110: Engineering Electronics II Fall 2007

Laboratory 2: Common Source Amplifier Frequency Response

(Spice Component)

Due Week 6 (Sept. 24-28)

1 Introduction

The purpose of this assignment is to learn SPICE simulation techniques, but more impor- tantly 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 expect in Lab 2. This will make your time in lab more efficient and allow you to learn more.

2 Procedure

Create a .cir file for the circuit shown in Fig. 1. 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, and make it easier to help you if you have questions. Now run the following simulations:

Figure 1: Common source amplifier schematic.

ECE 3110: Engineering Electronics II Fall 2007

  1. 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 gate and drain of M 2, as well as the drain current of M 2.
  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 at the output. This number doesnt need to be reported, just keep it in mind for Lab 2. Using the same simulation, report the gain at this frequency.
  3. 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 this 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.

3 Lab Report

Include the following in your lab report:

  1. Your SPICE input file(s).
  2. Report the DC voltage of the gate and drain of M 2 and the DC drain current of M 2.
  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.