The power amplifier can reproduce the CM voltage to be applied
to the primary of CMT with the required current, as shown
in Fig. 8. Moreover, the vertical scales of the two waveforms are different; the voltage applied to the primary of the CMT is
increased by the turn ratio of the same CMT before being subtracted
from the VCM generated by the inverter. In Figs. 9 and
10, photos of the experimental arrangement and of the active
filter prototype are shown, respectively. It is worth noting that to
set up the proposed circuit a power OA with a high bandwidth
and high slew rate is needed. There are some suitable components
on the market however it is often necessary to lessen the
rated bandwidth to avoid oscillations as suggested by the OA manufacturers.