Environmental Engineering Reference
In-Depth Information
feedback network formed by resistors and The sampled current is fed
back to a current-driven input port. Thus, the resultant driving point output
resistance is large, and the driving point input resistance is small. These
characteristics allow for a closed loop current gain, that is
relatively independent of source and load resistances as well as insensitive to
transistor parameters.
To analyse the circuit in Fig. 6.12, consider its small-signal model
illustrated in Fig. 6.13, where the model of the common X configuration
with a degenerative resistance (see Fig. 2.4) has been used for transistor T2,
and assume the transconductance
as critical parameter
P.
