Environmental Engineering Reference
In-Depth Information
The current gain is finite only for the bipolar technology, and it is given
by
If we assume an ideally unitary inner voltage gain, and a much higher
input resistance than the source resistance, the current gain can be
approximated as
2.7 FREQUENCY RESPONSE OF SINGLE TRANSISTOR
CONFIGURATIONS
To evaluate the frequency response of a circuit comprising the generic
active component, we have to consider the transistor high-frequency small-
signal model. This model is depicted in Fig. 2.10 and includes capacitors
and It generally applies to all transistor types although, as
discussed in Chapter 1, for each kind of device the capacitances have a
different physical meaning.
