labreport 7 (july 7)

labreport 7 (july 7) - EE 3221 Electronics II Laboratory...

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EE 3221 Electronics II Laboratory Suhas Patel Evan Trapani (Partner) 437-93-4360 July 7, 2004 Lab 7 (Experiment 20) Current Mirrors and Active Loads
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EE 3221 Suhas Patel July 7, 2004 Objective: To build discrete versions of analog circuits ordinarily founding integrated circuits. 1.) Figure 1 Plot the output voltage as a function of the positive supply voltage. Is the slope of this graph exactly 45 degrees? Yes, it is. At what supply voltage does the graph abruptly change? Why? 4.2 V, because the transistor is no longer operating in the constant current region.
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2.) Figure 2 Observe the output voltage with a scope, and vary the current in the bottom resistor by changing the negative supply. As the negative supply is varied between -6 and -5V, the output voltage is stable between 0 and 5V. For all other negative supply voltages, the output is unstable and drops below 0V. Can you balance the output between 0 and 5V? Yes, the output is between 0 and 5V for negative supply voltages between -6 and -5V.
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