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ECE 302 - Lab 4 - BJT's

# ECE 302 - Lab 4 - BJT's - Camry Simpson Laboratory Report 4...

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Camry Simpson Laboratory Report 4 BJT Amplifiers with Passive Loads 10/19/2010

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Introduction In this lab, we are working with BJT Amplifiers. We will be obtaining measurements such as gain, input/output impedance, etc. This will help in understanding the relative trade-offs between amplifiers. We will also discuss the trade-off issues among Voltage Gain, Input Resistance, and Output Resistance 3.0 Procedure 3.1. Common Emitter Amplifier 1. We constructed the following circuit using the following values: - V CC = 5V - R C = .975kΩ - R BTRIM1 = 96.5kΩ - R B1 = 295kΩ - R BTRIM2 = 3.89kΩ We started with a resistance of approximately 200kΩ for R B1 , but were advised to add a 100kΩ resistor since we could not obtain a collector voltage of 2.5V. So as you can see above, we had a final resistance of 295kΩ for R B1 . To verify that the transistor was in FORWARD ACTIVE, we recorded the values for V BE and V BC . We verified this with the measured values as follows: - V BE = .66V Since the Base-Emitter Voltage was a positive value and - V BC = -1.62V the Base-Collector Voltage was negative, this verified the assumption that we were in the Forward Active Region.
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ECE 302 - Lab 4 - BJT's - Camry Simpson Laboratory Report 4...

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