Environmental Engineering Reference
In-Depth Information
equal small-signal parameters, this equivalent transconductance is about
equal to
(see (2.15b)), and
is
which is greater than unity.
To evaluate the return ratio we set to zero and replace the original
controlled current generator, with an independent current source,
i
, as
shown in Fig 9.7. Aside from the opposite flow direction of the independent
current generators, Fig. 9.5 and 9.6 are identical. Therefore, the return ratio
exactly equals the direct transmission term (i.e.,
