Environmental Engineering Reference
In-Depth Information
where
is given by
and in which is assumed in the approximation.
From (2.22), which expresses the current gain of a common Y
configuration, assuming the input and output loss negligible (or in other
words directly from (2.21)) we get (assuming
Thus the return ratio,
T,
with respect to the critical parameter
is
3)
Evaluate now the closed loop asymptotic gain,
by setting the
parameter
infinitely large. By inspection of Fig. 6.2, since the current of
the controlled current generator,
is still finite, the voltage
must
be zero and this holds only if current
is zero. The KCL at node Z
1
implies
