The present contribution proposes a new method for the accurate
calculation of Miller effect on the frequency response (pole
and zeros determination) and on the input and output impedances
of feedback amplifiers, based on the FDT. First, a brief
presentation of the FDT is given for the cases of forward and
reverse calculations, both for unilateral and bilateral basic amplifiers
(Section II). Then, based on a generic single stage feedback
amplifier, Miller effect on the frequency response is for the
first time evaluated using both Miller’s Theorem and FDT, concluding
that the FDT approach is more accurate (Section III).
Miller effect on input and output impedances of a feedback amplifier
is also considered for both circuits resulting after Miller’s
Theorem and FDT applications. It is shown, by analysis and
SPICE simulation, that the FDT approach provides a more accurate
input impedance calculation, while it is the only one of
the two approaches that can provide reverse calculations, e.g.,
output impedance calculation (Section IV). Section V summarizes
the conclusions.