Finally, a low-pass filter introduces a further real pole that, together
with the power amplifier real pole, by a suitable open-loop
transfer function gain, can give a couple of complex conjugate
poles in the closed loop transfer function.
The transfer functions of the different sections of the active
filter are described in Table II.
Usually, the high-frequency pole of the CMT is quite higher
than the highest frequency pole of the power amplifier. This
occurs since the power amplifier bandwidth is limited to avoid
oscillations, whereas the CMT is realized with a suitable magnetic
material guaranteeing a high bandwidth. This hypothesis
will be experimentally verified, as explained in Section V.