A universal second-order filter circuit with voltage gain using only p
lus-type current conveyors (CCIIs) is presented. The circuit offers se
veral advantages, such as high input impedance, low filter sensitiviti
es to passive elements, use of grounded capacitors and independent con
trol of omega(0), Q and voltage gain with separate grounded resistors.
The use of only one type (plus-type or minus-type) of CCII simplifies
the configuration.