Environmental Engineering Reference
In-Depth Information
Moreover, the expression of is exactly as given by (6.35). Indeed
this equation was calculated assuming negligible compared to
However, in the opposite case of infinitely large we have to evaluate
under this hypothesis the voltage gain of the common Z in Fig. 6.17 and the
general result in (2.29) becomes
1
Thus, term
results to be
Now we are able to apply Blackman equations to obtain the closed-loop
input and output resistance expressions. The input resistance is reduced by
the specific loop gain in (6.39)
The output resistance although reduced by term (6.41) is also heavily
increased by the loop gain (6.35)
1
From the exact equation (2.28a)
assuming
we get
and
neglecting the input and output voltage loss in (2.29) we obtain
