Common Collector Amplifier

Question 1

This is a Common Collector because the input is applied to the _____, the output is taken from the _____, and the _____ is common.

Answer 1

This is a Common Collector because the input is applied to the base, the output is taken from the emitter, and the collector is common.

Question 2

The amplifier’s output is controlled by what?

Answer 2

The input signal.

Question 3

What are the two basic circuits of the Common Collector Amplifier?

What is common about the collector?

Answer 3

Two basic circuits:

1. Input - Base to Collector
2. Output - Collector to Emitter

The collector is common to both circuits.

Question 4

Does change in one circuit affect the other? If so, how?

Answer 4

Yes

A changing input signal changes the bias voltage on the base of the transistor.

When the input signal increases, the bias voltage increases. An increase in bias voltage increases current flow in the emitter collector circuit.

When the input signal decreases, the bias voltage decreases. A decrease in bias voltage decreases current flow in the emitter collector circuit.

Question 5

The effects of a changing input signal are seen in a changing output signal. An increasing input signal produces an _____ output signal. A decreasing input signal produces a ______ output signal.

Answer 5

increasing

decreasing

Question 6

Class of operation is determined by the bias placed on the base of ___by _____.

Answer 6

Class of operation is determined by the bias placed on the base of Q1 by R1 and R2.

Question 7

The voltage gain is determined by the ______.

Answer 7

The voltage gain is determined by the base to emitter PN junction.