An electronically tunable active-C current-mode universal filter employing CCCII and OTA

A new electronically tunable universal current-mode (CM) filter structure employing two CCCIIs, two OTAs and only grounded capacitors are presented. It's compatible with VLSI technology since no resistance is employed in the circuit. This versatile filter can simultaneously realize five basic transfer functions from the same configuration. It still maintains the following advantage: High-order filter structure can be easily derived from the proposed filter structure. The parameter ω
0
can be tuned by changing component manually without effect to the Q. The simulation results have been carried out by Pspice.