Environmental Engineering Reference
In-Depth Information
Now we set parameter infinitely large to calculate the closed-loop
asymptotic gain. Returning to Fig. 9.5, this means that voltage
must be
zero, as this condition holds only if the output current is zero. Thus
and, as expected in a current mirror, the closed loop transfer function
(current gain) is very close to one
The driving point input and output resistances,
and
are
calculated using the results in Chapter 2. They are given by
Finally we evaluate
and
to find the
input and output resistances
with the input and output resistances equal to
In conclusion, for a bipolar Wilson current mirror we get
