Question

For the amplifier of the figure below, we can define two equivalent diagrams in weak signals:

(i) Diagram in Pi (with resistance rpi)

(ii) Diagram in Tee (with resistor re)

1) Determine the configuration of this type of amplifier

2) For each of these two diagrams, determine:

 the input resistance Ri,

 the output resistance Ro,

 Voltage gains Av and current Ai

We assume that the output resistance is infinite (No Early Effect)

Rc Cout Cin out Vin NPN

Answer 1

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as Re> whese, o edput Resistomce RoCRelL vel toge gain

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