CE amplifier - How to limit bandwidth?

sherrellbc · Apr 17, 2013

When using the CE BJT amplifier configuration, when a shunt capacitor is placed across the collector resistor, how does this act as a bandwidth limiting cap?

Circuit schematic of a common-emitter BJT amplifier with a 2N2222 transistor, 9 V V_bias supply, R1 5.22kΩ, R2 3kΩ, R3 3.62kΩ, R4 20kΩ, R6 3kΩ, R10 50Ω, C1 and C6 1μF, C3 100μF, C5 4nF across the collector resistor, and Vin 50mVpk 2kHz 0°.

AlephZero · Apr 17, 2013

Two questions to help you answer the question yourself:

What happens to the amplifier gain when you change the collector impedance?
What happens to the impedance of C5 at high frequencies?

sherrellbc · Apr 17, 2013

I see. Thank you very much for that. I did not think about the affect on RC and the associated gain.

CE amplifier - How to limit bandwidth?

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