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Switched Capacitor Biquad Filter Using CDTA
epartment of Electronics and Communications Engineering, Shri Ramswaroop Memorial Group of Professional Colleges (SRMGPC), Lucknow, India
epartment of Electronics and Communications Engineering, Shri Ramswaroop Memorial Group of Professional Colleges (SRMGPC), Lucknow, India
Department of Physics and Electronics, R.M.L. University, Faizabad, India
Department of Electrical and Electronic Engineering, Kamla Nehru Institute of Technology (KNIT), Sultanpur, India
- 1 epartment of Electronics and Communications Engineering, Shri Ramswaroop Memorial Group of Professional Colleges (SRMGPC), Lucknow, India
- 2 epartment of Electronics and Communications Engineering, Shri Ramswaroop Memorial Group of Professional Colleges (SRMGPC), Lucknow, India
- 3 Department of Physics and Electronics, R.M.L. University, Faizabad, India
- 4 Department of Electrical and Electronic Engineering, Kamla Nehru Institute of Technology (KNIT), Sultanpur, India
Circuits and Systems·Volume 04 (2013)·Pages 438–442·Published 30 September 2013·DOI10.4236/cs.2013.46057
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Abstract
A switched capacitor biquad filter usin g current differ encing transconductance amplifier (CDTA) is presented in this paper. The proposed circui t employs only one CDTA, two virtually grounded capacitors and one switc hed capacitor. It is a resistorless circuit, so it is beneficial to IC implementation in terms of space consideration. The proposed circuit is a second order single input multiple output (SIMO) current-mode filter. This filter can simultaneously realize all basic filter functions high pass, low pass and band pass responses without any component-matching conditions. All the active and passive sensitivities are low. The natural angular frequency ( ω 0 ) and quality factor ( Q ) of proposed filter can be electronically controlled. Owing to current mode operation it consumes less power. PSPICE simulation results are used to verify the theoretical analysis.
KeywordsCurrent Differencing Transconductance Amplifier (CDTA)Biquad FilterCurrent-Mode Circuit
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