Cascadable Electronically Tunable Sito Current-mode Active-only Universal Filter

A novel current-mode active-only single-input and three-output (SITO) universal filter using three plustype second-generation current-controlled conveyors (CCCIIs), one operational transconductance amplifier (OTA) and two operational amplifiers (OAs) is presented. The circuit is fully programmable and implements simultaneously lowpass (LP), bandpass (BP),and highpass (HP) functions while Notch (BS) and allpass (AP) response can be synthesised by connecting the appropriate node currents without requiring additional components. The availability of currents at high impedances facilitates cascadibility feature. The filter performance factors natural frequency (ω0), bandwidth (ω0/Q), quality factor (Q) and gain (G) are electronically tuneable. The SPICE simulation results are included to confirm the workability of the proposed circuit.