A Geometric-mean Circuit for SRD Filters

Ebrahim Farshidi

Abstract


A current-mode square-root domain filter based on a new geometric-mean circuit is presented. The circuit is a tunable first-order low pass filter, working in low voltage, and featuring low nonlinearity. It employs MOSFETs that operate in both strong inverted saturation and triode regions. Simulation results by HSPICE confirm the validity of the proposed design technique and show high performance of the proposed circuit

Keywords


Current-mode, Geometric-mean, squarer/divider, Companding, Filter.

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References


] D. R. Frey, (1996) “Exponential state space filters: A generic current mode design strategy,†IEEE Trans. Circuits Syst. I, Vol. 43, pp. 34-42.

E. M. Drakakis, A. J. Payne, and C. Toumazou, (1999) “Log-domain state-space: A systematic transistor-level approach for log-domain filtering,†IEEE. Trans. Circuits Syst. II, Vol. 46, pp. 290-305.

E. Morsy and J. Wu, (2000) “Low voltage micropower log-domain filters,†Analog Integr. Circuits Signal Processing , Vol. 22, pp. 103-114.

C. A. D. L. C. Blas, A. J. Lopez-Martin and A. Carlosena, (2004) “1.5v tunable square-root domain filter,†Electron. Lett. , Vol. 40, No. 4, pp. 133-147.

A. J. Lopez-Martin and A. Carlosena, (2002) “A 1.5v CMOS companding filter,†Electron. Lett. , Vol. 38, No. 22, pp. 1299-1300.

J. Mulder, A. C. V. D. Woerd, W. A. Serdijn and A. H. M. V. Roermund, (1996) “Current-mode companding √x-domain integrator,†Electron. Lett. , Vol. 32, No.3, pp.198-199.

R. G. Carvajal, J. Ramirez-Angulo, A. J. Lopez-Martin, A. Torralba, A. G. Galan, A. Carlosena and F. M. Chavero, (2005) “The flipped voltage follower: A useful cell for low-voltage low power circuit design,†IEEE Trans. Circuits Syst. I: Regular Paper, Vol. 52, No. 7, pp. 1276-1291, 34-42.

C. A. D. L. C. Blas, A. J. Lopez-Martin and A. Carlosena, (2003) “1.5v MOS translinear loops with improved dynamic range and their application to current-mode signal processing,†IEEE. Trans. Circuits Syst. II, Analog Digit. Signal process, Vol. 50, No. 12, pp. 918-927.

C. Psychalinos and S. Vlassis, (2002) “A systematic design procedure for square-root -domain circuits based on the signal flow graph approach,†IEEE Trans. Circuits Syst. I, Fundam. Theory Appl., Vol. 49, No. 12, pp. 1702-1712.

M. Eskiyerli and Payne, (2000) “Square root domain filter design and performance,†Analog Integr. Circuits Signal Processing, Vol. 22, pp. 231-243.

E. Seevinck, (1990) “companding current-mode integrator: a new circuit principle for continuous-time monolithic filters, Electron. Letter†Vol. 26, pp. 2046-2047.

C. A. D. L. C. Blas, A. J. Lopez-Martin and A. Carlosena, (2004) “Low voltage CMOS nonlinear transconductors and their application to companding current-mode filters,†Analog Integr. Circuits Signal Processing, Vol. 38, pp. 137-147.

J. Mulder, W. A. Serdijn, A. C. V. D. Woerd, and A. H. M. Roermund, (2000) “Dynamic translinear circuits - an overview, (2002)†Analog Integr. Circuits Signal Processing, Vol. 22, pp. 111-126.

C. Psychalinos and S. Vlassis, (2001) “A high performance square-root domain integrator,â€Analog Integr. Circuits Signal Processing, Vol. 28, No. 3, pp. 97-101.

E. Farshidi and S. M. Sayedi, (2007) “A Square-Root Domain Filter Based on a New Geometric-mean Circuit,†15th Iranian Conference on Electrical Engineering ICEE2007, pp. 6-11.


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ISSN: 1694-2507 (Print)

ISSN: 1694-2108 (Online)