ENG  Vol.2 No.3 , March 2010
Tunable Bandwidth Third Order Switched-Capacitor with Multiple Feedbacks Filter for Different Center Frequencies
Abstract: This paper proposes third order tunable bandwidth active Switched-Capacitor filter. The circuit consists of only op-amps and switched capacitors. The circuit is designed for circuit merit factor Q = 10. The proposed circuit implements three filter functions low pass, band pass and high pass simultaneously in single circuit. The filter circuit can be used for both narrow as well as for wide bandwidth. For various values of cut-off frequencies the behaviour of circuit is studied. The circuit works properly only for higher central frequencies, when f0 > 10 kHz.
Cite this paper: nullG. Shinde and S. Bhagat, "Tunable Bandwidth Third Order Switched-Capacitor with Multiple Feedbacks Filter for Different Center Frequencies," Engineering, Vol. 2 No. 3, 2010, pp. 179-183. doi: 10.4236/eng.2010.23025.

[1]   G. N. Shinde and P. B. Patil, “Study of active-R second order filter using feedback of non-inverting terminal,” Bulletin of Pure and Applied Sciences, Vol. 21 D, No. 1, pp. 23-30, 2002.

[2]   G. N. Shinde and S. R. Bhagat, “Universal second order active switched-capacitor filter for different Q values,” Indian Journal of Physics, Vol. 82, No. 10, pp. 1329-1337, 2008.

[3]   S. Srinivasan, “Synthesis of transfer functions using the operational amplifier pole,” International Journal of Electronics, Vol. 40, No. 1, pp. 5-13, 1976.

[4]   M. Ghausi, “Analog active filters,” IEEE Transactions on Circuits and Systems, Vol. 31, pp. 13-31, 1984.

[5]   G. N. Shinde, P. B. Patil, A. B. Kadam and P. R. Mirkute, “Active-R biquadratic filter using positive feedforward signal,” BRI’S JAST, Vol. 5(I and II), pp. 7-15, 2002.

[6]   W. R. Grise, “Applications of switched capacitor circuits in active filters and instrumental amplifiers,” Vol. 3, No. 3, pp. 1523-1526, 1999.

[7]   U. Kumar, “Design and a nalytical study of strays-insensisitive switched capacitor filter,” Active and Passive Electronic Components., Vol. 19, pp. 13-24, 1996.

[8]   Z. X. Sun, “Active-R filter: A new biquadratic with four terminal,” International Journal of Electronics, Vol. 54, No. 4, pp. 523-530, 1993.

[9]   A. Kumar and S. K. Saha, “MOS switched capacitor sample data filters,” Vol. 55, No. 4, pp. 631-637, 1983.

[10]   M. A. Shah, M. R. Rathu and S. Z. Iqbal, “SITO electronically tunable high output impedance current mode universal filter,” Analog-Integrated Circuit and Signal Processing, Vol. 47, pp. 335-338, 2006.

[11]   G. J. Yu, C. Y. Huang, J. J. Chen and B. D. Liu, “Design of current mode square root domain bandpass filter with reduced voltage,” Analog-Integrated Circuit and Signal Processing, Vol. 44, pp. 239-250, 2005.

[12]   R. Senani and S. S. Gupta, “Low universal filter using only current followers as active elements,” International Journal of Electronics and Communication, Vol. 60, pp. 251-256, 2006.

[13]   J. G. Jiang and Y. N. Wang, “Design of a tunable frequency CMOS fully differential fourth order chebyshev filter,” Microelectronics Journal, Vol. 37, pp. 84-90, 2006.