Electronically Tunable Current / Voltage-Mode Universal Biquad Filter using CCCCTA

This paper presents an electronically tunable current/voltage mode universal biquad filter using current controlled current conveyor transconductance amplifiers (CCCCTAs). The proposed filter employs only two CCCCTAs and two grounded capacitors. The proposed filter can simultaneously realize low pass (LP), band pass (BP) and high pass (HP) responses. Realization of band reject (BR) and all pass (AP) responses are also feasible. The circuit can also be operated in mixed mode with either voltage or current input and current or/and voltage outputs, thus the configuration is versatile. The circuit enjoys an independent current control of pole frequency and bandwidth. Moreover, the LP and BP gain can be independently tuned by external biasing current of active elements without disturbing the pole frequency, quality factor and bandwidth. Both the active and passive sensitivities are no more than unity. The validity of proposed filter is verified through PSPICE simulations. The total power consumption is about 0.641mW at ±1.85V supply voltages.

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