
352
(Iß/'V
r
B
curve). Inserting a relatively large linear R makes the total
resistance nearly linear and therefore the input current, and
therefore also the output current, nearly proportional to the input
signal voltage. But of course most of the signal is lost in R.
Fig. 19.24 One way of linearising a transistor is by
means of a relatively high resistance R in series with
the input
If instead negative voltage feedback were used the result would be
just the same; the voltage drop due to I
B
flowing through R would be
replaced by a voltage drop due to h
(E
I
B
flowing through part of R
L
.
But whereas the series-resistance method linearises only th ...