A Digitally Programmable CMOS Universal Biquad Filter Using Current-Mode Integrators

摘要

In this paper, we propose a universal biquad filter that canrealize all types of 2nd-order functions, such as Low-pass Filter(LPF), High-Pass Filters (HPF), Band-Pass Fil- Ters (BPF),Band-Elimination Filters (BEF), and All-Pass Filters (APF). Also, thefilter types can be programmable digitally with built-in switches.The proposed circuit can be realized by using a CMOS technology thatis suitable for a mixed digital-analog LSI. In addition, the circuitcan operate in high frequencies with A low power supply voltagebecause it is based on a current-mode Circuit. Finally, the proposedcircuit is simulated by PSpice to Confirm its characteristics.