Transimpedance Type Fully Integrated Biquadratic Filters Using Operational Transresistance Amplifiers

Operational transresistance amplifier (OTRA) is an inherently suitable active building block for transimpedance type signal processing because of its current input/voltage output nature. It is due to the fact that both input and output terminals of OTRA are characterized by low impedance. In this paper, we present an OTRA based transimpedance type biquadratic filter configuration. It realizes all five different filtering functions, namely low-pass, high-pass, band-pass, notch and all-pass. The configuration can be made fully integrated based on MOS-C realization by making use of current differencing and internally grounded inputs of OTRA.