NEW HIGH INPUT IMPEDANCE VOLTAGE-MODE LOWPASS, BANDPASS AND HIGHPASS FILTER USING CURRENT FEEDBACK AMPLIFIERS

摘要

A new high input impedance filter employing three current feedback amplifiers (CFAs) and six passive elements, three of them are grounded, is presented. The proposed circuit offers the following advantages: simultaneous realization of lowpass (LP), bandpass (BP) and highpass (HP) filtering functions, employs two grounded capacitors, exhibits high input and low output impedances which permits easy cascade connection, low passive sensitivity figures and orthogonal control of resonance frequency (豞o) and bandwidth (ω_o/Q). PSPICE simulation results are given to verify the theoretical calculations.