Environmental Engineering Reference
In-Depth Information
Stability and related frequency compensation issues of CFOAs have been
treated in [MT96], but the approach adopted is not simple from a design
point of view and leads to unnecessary conditions being placed on the
feedback network. Moreover, this analysis neglects a fundamental
contribution that arises when the CFOA load is capacitive, which is an usual
circumstance.
In order to apply the compensation procedures described in Chapters 4
and 5, we need to evaluate the return ratio. After substituting the CFOA
small signal model in the circuit in Fig. 9.13 we choose the voltage gain of
buffer as the critical parameter. Setting the input source to zero and
representing the critical controlled voltage source
with v' we get the
equivalent circuit in Fig. 9.15.
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