UACEE International Journal of Advances in Electronics Engineering Volume 2: Issue 3 ISSN 2278 - 215X (Online) 207 CCCDBA Based Voltage Mode TOW – THOMAS Biquadratic Filters Vishal Ramola 1 1 Assistant Professor, Department of Electronics and Communication Engineering Uttarakhand Technical University, Dehradun, Uttarakhand, India vishal_anu@hotmail.com R.K. Singh 3 3 Professor, Department of Electronics and Communication Engineering, Kumaon Engineering College, Dwarahat, Almora, Uttarakhand, India Saurabh Mishra 2 1 Assistant Professor, Department of Electronics and Communication Engineering Graphic Era University, Dehradun, Uttarakhand, India, saurabhmishra2004@gmail.com D.S. Chauhan 4 4 Vice chancellor, Uttarakhand Technical University, Dehradun, Uttarakhand, India Abstract - This article presents a voltage-mode universal bi-quadratic filter performing completely standard functions: low-pass, high-pass, band-pass, band-reject and all-pass functions, based-on Current Controlled Current Differencing Buffered Amplifiers (CCCDBAs) TOW-THOMAS mode equivalent. The features of the circuit are that: the quality factor and pole frequency can be tuned orthogonally via the input bias currents: the circuit description is very simple, consisting of merely few CCCDBAs and grounded capacitors. Without any external resistors and using only grounded elements, the proposed circuit is very comfortable to further develop into an integrated circuit. The PSPICE simulation results are depicted. The given results agree well with the theoretical anticipation. Key Words –All pass filter, Band pass filter, Current- controlled current differencing buffered amplifier (CCCDBA), High pass filter, Low pass filter, Notch filter, Voltage-mode TOW-THOMAS-equivalent BIQUAD, Voltage mode integrator. I. INTRODUCTION Since the proposed circuits are based on CCCDBAs, a brief review of CCCDBA is given here. In Ip CCCDBA Z Vz Ia Vw P N Vn Vp W Iz Figure1. Symbolic representation of current-controlled CDBA [7],[8] CCCDBA is a translinear based current-controlled current differencing buffered amplifier (CC- CDBA’s) whose parasitic input resistances can be varied electronically. Basically, the CCDBA is a four-terminal active element. For ideal operation, it’s current and voltage relations described by the matrix of equation-1 [11], [12],[13]. From the circuit operation, the current-voltage characteristics of CC-CDBA can be expressed by the following matrix.