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In Lab 2 we showed that the small signal output resistance of
an emitter follower circuit is given by
| |
(127) |
where RS' is the output or source resistance of the previous
stage of the circuit. In our circuit,
RS'=RC2, so the output resistance of the circuit is given
by
| |
(128) |
The input resistance of the circuit is identical to that of
the diff-amp in the previous section of this lab, which is given
by
| |
(129) |
With the small signal input and output resistances, as well
as the voltage gain ascertained, we can draw an equivalent
circuit for the amplifier.
Neil Goldsman
10/23/1998