Topics
Points of Emphasis
Prerequisites
Lab Activities
Given the appropriate circuit diagrams, the students build and operate a square
wave and a sine wave oscillator.
For the square wave oscillator, they are asked to:
1. measure the period of the square wave and compare it to the time constant
of the RC input circuit;
2. sketch the gate-to-source voltage vs time curves for the two transistors
used and explain their respective shapes;
3. sketch the gate-to-source voltage vs time graph for the first transistor
and the drain-to-source voltage vs time graph for the second transistor and
explain their respective shapes;
4. sketch the gate-to-source voltage vs time graph for the first transistor
and the drain-to-source voltage vs time graph for the first transistor and
explain their shape;
5. vary the value of the capacitors used and see what affect this has on the
square wave generated; and
6. explain how the square wave generator works.
For the sine wave generator, they are asked to:
1. measure the period of the sine wave produced and compare it to the resonant
period of the LC circuit in the oscillator; and
2. measure the single stage gain and the two stage gain and compare the values
to the expected values;
3. measure the attenuation from the resistances in the attenuator and compare
that value to the expected value;
4. measure the loop gain and compare it to the expected value; and
5. explain how the sine wave generator works.
Quantitative results tend to be within 10% of the expected values.
Course Level
Introductory: P4, P14, P16
Student Handouts
Equipment
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Number of set-ups available: 10
Per lab station:
1 HP 54600A oscilloscope
1 oscillator
2 10:1 probes
1 frequency counter
2 BNC -> banana adaptor (female)
2 banana leads
2 alligator clips
1 60 in 1 electronics kits (student supplied)
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Notes
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