ECE Undergraduate Laboratory
ECE 371 - Electronic Circuits Design
Introduction to single stage and multistage transistor-based amplifiers.
Introduction to single stage common-emitter and common-source transistor-based amplifiers.
Simulate both the common-emitter and common-source amplifiers. Make sure that the Q-point is close to the middle of the load line for maximum swing. Use a finite gain like 10 or so and estimate the input and output impedance from the simulation. The load can be chosen to be much greater than the output resistance of the amplifier. Also estimate the input signal range.
Lecture Notes, Course textbook.
Build this common-emitter amplifier with the required swing and gain. Measure all appropriate characteristics mentioned in the prelab and compare to the calculated and simulated results. Discuss any variation. Use a resistor RI = 1kΩ between the source and the amplifier, measure the voltage across it to have access to the input current for the purpose of the input resistance measurement, and the resistance box for the output resistance. Note that you must be cautious if you use the scope for amplitude measurement, and a DMM for RMS measurement.
Build this common-source amplifier with the required swing and gain. Measure all appropriate characteristics mentioned in the prelab and compare to the calculated and simulated results. Discuss any variation. Use a resistor RI = 1kΩ between the source and the amplifier, measure the voltage across it to have access to the input current for the purpose of the input resistance measurement, and the resistance box for the output resistance. Note that you must be cautious if you use the scope for amplitude measurement, and a DMM for RMS measurement.
Introduction to single stage emitter follower and source follower transistor-based amplifiers.
Simulate both the emitter follower and source follower amplifiers. Make sure that the Q-point is close to the middle of the load line for maximum swing. Use a finite gain between 0.5 and 1 and estimate the input and output impedances from the simulation. The load can be chosen to be much greater than the output resistance of the amplifier. Also estimate the input signal range.
Lecture Notes, Course textbook.
Build the circuit that you simulated, measure the required characteristics (the most important one being the output resistance), and compare with the calculated and simulated values.
Perform the same steps as in the previous section, and in addition, compare the characteristics of the source follower with the characteristics of the emitter follower.
Design a 3-stage amplifier where the most important characteristic is a voltage gain of 1000. Verify by using a 1mVp-sinusoidal input signal. The output should be a 1Vp sinewave, and as clean as possible.
Present all schematics and measurements. Describe briefly how the circuits you tested work. Do the measured frequencies and waveform agree with expectations? Include all observations on the circuits performance and if possible give explanations.
Note that there are 3 parts. Each part should have its own priority in terms of calculations, simulation, and implementation. Provide all the necessary steps in how you achieved your designs, observations, comments, discussion. A final conclusion for the three parts will be necessary.