Abstract
This paper describes self-tuned continuous-time filters. A self-tuned filter in the context of this paper, is one which is being tuned continuously while it is in the system. No switching is involved. Whereas the more common master-slave approach relies on matching of components, the self-tuning approach does not. Consequently, the self-tuning approach promises more precision. Experimental work includes an implementation in 3μm CMOS of a filter which operates up to 20 MHz and of a phase-locked loop which performs a self tune of the filter. Simulations and measurements which demonstrate the functionality of the approach are reported.
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References
R.L. Geiger and E. Sanchez-Sinencio, “Active filter design using operational transconductance amplifiers: a tutorial,”IEEE Circuits and Devices Magazine, pp. 20–32, March 1985.
K.A. Kozma, D.A. Johns, and A.S. Sedra, “An adaptive tuning circuit for integrated continuous-time filters,”Proc. ISCAS, pp. 1163–1166, 1990.
T. Kwan and K. Martin, “An adaptive analog continuous-time CMOS biquadratic filter,”IEEE J. Solid-State Circuits, vol. SC-26, pp. 859–867, 1991.
D.L. Hiser and R.L. Geiger, “Impact of OTA nonlinearities on the performance of continuous-time OTA-C bandpass filters,”Proc. ISCAS, pp. 1167–1170, 1990.
B. Nauta and E. Seevinck, “Automatic tuning of quality factors for VHF CMOS filters,”Proc. ISCAS, pp. 1147–1150, 1990.
C.S. Park and R. Schaumann, “Design of an eighth-order integrated CMOS continuous-time bandpass filter with digital/analog control of frequency and quality factor,”Proc. ISCAS, pp. 754–757, May 1987.
V. Gopinathan and Y. Tsividis, “A 5 V 7th order elliptic analog filter for digital video applications,”Proc. ISSCC, pp. 208–209, 1990.
H. Khorramabadi and P.R. Gray, “High-frequency CMOS continuous-time filters,”IEEE J. Solid-State Circuits, vol. SC-19, pp. 939–948, 1984.
C. Plett, M.A. Copeland, and R.A. Hadaway, “Continuous-time filters using open-loop tunable transconductance amplifiers,”Proc. ISCAS, pp. 1172–1176, May 1986.
Y. Tsividis, M. Banu, and J. Khoury, “Continuous-time MOSFET-C filters in VLSI,”IEEE Trans. Circuits Syst., vol. CAS-33, pp. 125–140, 1986.
C. Plett, “A study of continuous-time filters,” Ph.D. dissertation, Carleton University, June 1991.
Canadian Microelectronics Corporation, “Guide to the Integrated Circuit Implementation Services of the Canadian Microelectronics Corporation,” version 2:0, Jan. 1986.
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Plett, C., Copeland, M.A. Self-tuned continuous-time notch filters. Journal of VLSI Signal Processing 8, 227–240 (1994). https://doi.org/10.1007/BF02106448
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DOI: https://doi.org/10.1007/BF02106448