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The circuit in Fig.6.1 is a current mirror. The circuit works as a
current source where the magnitude of the current is determined
by Rp. By choosing Rp, you can determine the current
through Q1 by KVL. Since VBE1=VBE2, the current
through Q2 is the same as the current through Q1. The
current through Q1 is the current source current.
(see class notes and text).
- 1.
- Verify that the current through R2 is always approximately 1mA,
for the 100, 1k,
and 5k loads.
- 2.
- Design a current mirror which acts as a constant
source providing 2mA. Keep the supply voltage at 10.7V.
- 3.
- Try to determine a method to measure the output resistance of the
current source.
- 4.
- Design and build a differential amp with single ended gain of approximately
100.
Start by designing a current mirror that provides 2mA.
Then choose appropriate values for RC to give the required gain.
(Review lab 5 for ideas)
Figure 6.1:
Current Mirror
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Next: Experiment: Active Loads
Up: Lab 6: Design and
Previous: Lab 6: Design and
Neil Goldsman
10/23/1998