BJT Amplifiers - The Common-Emitter Amplifier
6 important questions on BJT Amplifiers - The Common-Emitter Amplifier
Determine the following ac values for the amplifier in Figure 6–53.
IE= 2,63 mA
(a) Rin(base) (b) Rin (c) Av (d) Ai (e) Ap ![]()
Assume that a 600 Ω, 12 mV rms voltage source is driving the amplifier in Figure 6–53. Determine the overall voltage gain by taking into account the attenuation in the base circuit, and find the total output voltage (ac and dc). What is the phase relationship of the collector signal voltage to the base signal voltage?![]()
The amplifier in Figure 6–54 has a variable gain control, using a 100 V potentiometer for RE with the wiper ac-grounded. As the potentiometer is adjusted, more or less of RE is bypassed to ground, thus varying the gain. The total RE remains constant to dc, keeping the bias fixed. Determine the maximum and minimum gains for this unloaded amplifier.![]()
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If a load resistance of 600 Ω is placed on the output of the amplifier in Figure 6–54, what are the maximum and minimum gains?![]()
Find the overall maximum voltage gain for the amplifier in Figure 6–54 with a 1.0 kΩ load if it is being driven by a 300 kV source.![]()
Modify the schematic to show how you would “swamp out” the temperature effects of r9 e in Figure 6–53 by making Re at least ten times larger than r9 e. Keep the same total RE. How does this affect the voltage gain?![]()
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