Simple common-emitter amp

230

04:02:27

Basic common-emitter amplifier with emitter degeneration to improve temperature stability and input impedance.
Bias is chosen to give 5V drop at 1ma quiescent current, input impedance is 100k at a beta of 100, output impedance is 5k, voltage gain around 4.5

published 12 years ago

mannie_

11 years ago

How do I combine ac nd dc... nd how do I find all the parameters...beta...quiescent current, nd others

Chryseus

11 years ago

The quiescent current is set by the collector resistor to 1mA for a quiescent voltage of 5V (5V/1mA), beta is simply assumed to be around 100 since the emitter degeneration can tolerate some variation, the input impedance is beta*Remitter and output impedance is simply the collector resistance, gain is Rcollector/Remitter.

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