Design of Biquad Universal Filter Using Operational Transconductance Amplifier

Abstract

This paper presents concept of universal filter using operational trans-conductance amplifier (OTA). The 0.18μm CMOS process is used for design and simulation. This OTA has basing current of 50μA with supply voltage ±1.25v. The design and simulation of this OTA is done using tanner tool 0.12μm technology file. This paper presents an electronically tunable voltage mode universal biquadratic filter with Three input and single output using two single ended OTA and two capacitors. The proposed filter provides low-pass, High-pass, Band-pass and Band-stop by appropriately connecting the input terminals. The natural frequency and the quality factor can be set orthogonally by adjusting the circuit components. Also, the natural frequency can be electronically tuned via the bias currents of OTAs.