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Journal of Electrical and Computer Engineering
Volume 2011, Article ID 897631, 5 pages
Research Article

Single CDTA-Based Current Mode All-Pass Filter and Its Applications

1Department of Electronics and Communications Engineering, Delhi Technological University, Delhi 110042, India
2Department of Electronics Engineering, Indian School of Mines, Jharkhand 826004, India

Received 31 March 2011; Revised 20 July 2011; Accepted 4 August 2011

Academic Editor: Raj Senani

Copyright © 2011 Neeta Pandey and Sajal K. Paul. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a single current difference transconductance amplifier (CDTA) based all-pass current mode filter. The proposed configuration makes use of a grounded capacitor which makes it suitable for IC implementation. Its input impedance is low and output impedance is high, hence suitable for cascading. The circuit does not use any matching constraint. The nonideality analysis of the circuit is also given. Two applications, namely, a quadrature oscillator and a high Q band pass filter are developed with the proposed circuit. The functionality of the circuit is verified with SPICE simulation using 0.35 m TSMC CMOS technology parameters.