Digitally Controlled Current Mode Universal Filter

A new electronically tunable biquad filter structure employing three current controlled conveyors and two grounded capacitors is presented. The proposed filter offers the following advantageous features: low input impedance and high output impedance-a desirable property of current mode filters, realization of low pass, band pass, high pass, notch, low pass notch, high pass notch and all pass signals from the same configuration using switches, no matching constraint, low sensitivity performance and use of grounded capacitors ideal for integration. The validity of the proposed filter is verified through PSPICE simulations.