Abstract
This manuscript presents a novel digital frequency tuning technique for integrated active RC filters. Unlike the traditional tuning approach of varying the values of the capacitors or resistors, the proposed technique achieves the tuning by varying the currents that flow through the resistors or capacitors. In this manuscript, the current varying is achieved by using a digital-controlled MOSFET-only current division network. This new tuning technique features digital tuning, compact size, and wide tuning range as well as high linearity as demonstrated by transistor-level circuit simulations.
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A. Durham, J. Hughes, and W. Redman-White, “Circuit architectures for high linearity monolithic continuous-time filtering.” IEEE Trans. Circuits and Systems, pp. 651–657, Sept. 1992.
R. Shariatdoust, K. Nagaraj, J. Khoury, S. Daubert, and D. Fasen, “An integrating servo demodulator for hard disk drives.” In Proc. IEEE Custom Integrated Circuits Conference, 1993, pp. 10.6.1–10.6.5.
H. Khorramabadi, M.J. Tarsia, and N.S. Woo, “Baseband filters for IS-95 CDMA receiver applications featuring digital automatic frequency tuning.” In Digest of Technical Papers, IEEE Int. Solid-State Circuits Conference, 1996, pp. 172–173.
J.M. Khoury, “Continuous-time filters.” In The Circuits and Filters Handbook, W.K. Chen (Ed.), CRC Press and IEEE Press, 1999, pp. 58.1–58.32.
U.-K. Moon and B.-S. Song, “Design of a low-distortion 22-KHz fifth-order bessel filter.” IEEE J. Solid-State Circuits, vol. 28, no. 12, pp. 1254–1264, 1993.
K. Bult and G.J.G.M. Geelen, “An inherently linear and compact MOST-only current division technique.” IEEE J. Solid-State Circuits, vol. 27, no. 12, pp. 1730–1735, 1992.
C.M. Hammerschmied and Q. Huang, “Design and implementation of an untrimmed MOSFET-Only 10-bit a/d converter with −79 dB THD.” IEEE J. Solid-State Circuits, vol. 33, no. 8, pp. 1148–1157, 1998.
H.A. Alzaher, H.O. Elwan, and M. Ismail, “A CMOS highly linear channel-select filter for 3G multistandard integrated wireless receivers.” IEEE J. Solid-State Circuits, vol. 37, no. 1, pp. 27–37, 2002.
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Pun, Kp., Choy, Cs., Chan, Cf. et al. Current-Division-Based Digital Frequency Tuning for Active RC Filters. Analog Integr Circ Sig Process 45, 61–69 (2005). https://doi.org/10.1007/s10470-005-3424-x
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DOI: https://doi.org/10.1007/s10470-005-3424-x