Finding Input/Output Impedance of a CE Amplifier: Practical Methods

Thread starter phabos
Start date Jul 2, 2011
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Amplifier Impedance Practical

AI Thread Summary

To find the input and output impedance of a common emitter (CE) amplifier, begin by determining the small-signal hybrid-pi model parameters for the transistor. Next, write the Kirchhoff's Voltage Law (KVL) loop equations for both the input and output circuits, incorporating the biasing and hybrid-pi model. After establishing the equations, manipulate them algebraically to derive the input and output driving-point impedances. Practical methods include using voltage divider techniques to measure these impedances effectively. This approach ensures accurate impedance characterization for CE amplifiers.

Jul 2, 2011

phabos

how can i find input and output impedance of a ce amplifier- (voltage divider )..suggest practical methods?

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Jul 3, 2011

jsgruszynski

The basic steps are:

Determine the small-signal hybrid-pi model parameters for the transistor
Write the KVL loop equations for the input and the output (bias circuits and hybrid-pi)
Manipulate algebraically to the input and output driving-point impedances

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