A Current Mode Universal Filter and a Single
Resistance Controlled Oscillator Employing only
Grounded Passive Elements: Applications of VDCC
This research article explores the possible applica-
tions of voltage differencing current conveyor (VDCC), as a current
mode universal filter and a sinusoidal oscillator. Without the need
for an additional active/passive element, a very simple hardware
modification makes it a dual-mode quadrature oscillator from the
filter configuration. Both the proposed circuit requires only two
VDCC and all grounded passive elements, hence a preferable
choice for integration. The filter has some desirable features such
as availability of all five explicit outputs, independent tunability of
filter parameters. Availability of explicit quadrature current out-
puts, independence in start and frequency of oscillations, makes it
a better oscillator design. Apart from prevalent CMOS simulation
results, VDCC is also realized and experimentally tested using the
off-the-shelf integrated circuit. All the pen and paper analysis such
as non-ideal, sensitivity and parasitic analysis supports the design.