Jason 14

# Jason 14 - Randall Robert (9771) Lab 3 Experiment 14...

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Randall Robert (9771) Lab – 3 Experiment – 14 10-12-04 Design of an AC Variable-Gain Amplifier

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Objective: To design and study the performance of a typical single-stage amplifier, with particular attention to obtaining a stable DC operating point and a desired AC gain. Procedure: Follow the lab manual for proper procedure Part 1: Choose values of the supply voltages and resistors for the figure below so that the collector potential is approximately half the positive supply voltage.
· What values did you choose? V ee =-10V; V cc =+10V; R c =4.7k; R b =10k; R e =10k; I c =(-I e )=(V e -V ee )/Re=0.93mA · What is the dc voltage at the base, and how is it determined? It was -57.84mV wich is approximately zero. This is due to the base being grounded through a resistor. There is very little current flowing from base to emitter V b =-I b R b -Choose a capacitor with a negligible impedance at 10kHz, so that with a 10kHz input signal very little ac signal is present on it, no matter how the potentiometer is adjusted. ·What value did you choose?

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## Jason 14 - Randall Robert (9771) Lab 3 Experiment 14...

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