JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS, vol.29, no.8, pp.2050132, 2020 (SCI-Expanded)
Active elements are fundamental circuits for a wide scope of scientific
and industrial processes. Many researchers have examined active devices
to implement filters, oscillators, rectifiers, and converters. This
paper presents the current differencing operational amplifier (CDOA) as
an active element, firstly implemented with CMOS transistors. The input
part of this circuit is a current differencing unit and the conventional
operational amplifier (Op-Amp) pursues it. A new realization of a notch
filter consists of CDOA is suggested. Voltage-mode band-pass filter and
current-mode notch filter are presented as a different filter
applications. Simulation results using TSMC 0.18-mu m CMOS process model
are used to verify the theoretical analyses. The sensitivity, noise,
total harmonic distortion (THD) and the Monte Carlo analysis have been
performed to demonstrate the effectiveness of the proposed active
element and notch filter.