Environmental Engineering Reference
In-Depth Information
which leads to
The closed-loop transconductance is given combining (6.57), (6.60) and
(6.62) in (3.7), and since the loop gain is generally very large, the closed
loop transconductance is quite equal to the asymptotic one
The assumption of ideal voltage and current buffer for Tl and T3,
respectively, in the evaluation of the return ratio, means that we are
neglecting the load effect of resistance and Hence, the return ratios
calculate nullifying the source or the load resistance are almost equal to the
value given by relationship (6.60)
Besides, we have to evaluate the other two specific return ratios and
To do this, return to Fig. 6.24. To calculate assume again
that transistor T3 is an ideal voltage buffer. Thus voltage which is equal
to appears unchanged at terminal X3, and the voltage at node Y2
can be found by considering two voltage partitions in X1 and Y2
respectively
Thus
is
