Title: TUNABLE CURRENT-MODE TOW-THOMAS BIQUAD BASED ON CDTAs

Year of Publication: 2013
Page Numbers: 366-370
Authors: Muhammed Abdulbaki Ibrahim
Conference Name: The Third International Conference on Digital Information Processing and Communications (ICDIPC2013)
- United Arab Emirates

Abstract:


A new current-mode Tow-Thomas biquad filter based on employing current differencing transconductance amplifiers (CDTAs) is introduced. The filter circuit uses two grounded capacitors and realizes a lowpass (LP) and a bandpass (BP) responses, simultaneously. The proposed circuit is electronically tunable by adjusting the biasing current of the CDTAs. The circuit requires no component matching conditions for realizing the transfer functions listed above. Additionally, the circuit parameters Q and ω0 can be tuned orthogonally by adjusting the bias currents of the CDTAs and grounded capacitors. It is clear from sensitivity analysis that the proposed biquad circuit has very low sensitivities with respect to the circuit components.