A Novel Voltage-Mode Universal Filter Using OTAs and CFA

摘要

This paper presents a novel circuit configuration for realizing voltage-mode three input and one-output type universal filter based on and employing a single current feedback amplifier (CFA), two operational transconduc-tance amplifiers (OTAs) and as many capacitors. The employments of OTAs provide electronic tuning capability to pertinent filter characteristics, which is highly desirable in IC design. The circuit offers the following features: realization of all standard filtering functions from the same configuration, no use of resistors, no imposition of component matching conditions, orthogonal control of natural frequency and bandwidth, low active and passive sensitivities, minimum active and passive components and cascadibility. PSPICE simulation results are included.