A novel square-root domain realization of first order all-pass filter

In this paper, a new square-root domain, first order, all-pass filter based on the MOSFET square law is presented. The proposed filter is designed by using nonlinear mapping on the state variables of a state space description of the transfer function. To the best knowledge of the authors, the filter is the first square-root domain first order all-pass structure designed by using state space synthesis method in the literature. The center frequency of the all-pass filter is not only attainable at megahertz frequencies but also tunable by an external bias current. The proposed filter operated 2.5 V supply voltage is constructed by current mirrors, geometric mean circuits, a linear transconductor circuit, and a capacitor. SPICE simulations are given to approve the theoretical analysis.

Anahtar Kelimeler:

Square-root domain circuits, all-pass filter, state-space synthesis.

A novel square-root domain realization of first order all-pass filter

Keywords:

Square-root domain circuits, all-pass filter, state-space synthesis.,

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Y. P. Tsividis V. Gopinathan, L. T´oth, “Companding in signal processing”, Electronics Letters, Vol. 26, pp. 1331– , 1990.
R. W. Adams, “Filtering in the log-domain”, Presented at 63rdAES Conference, May 1979.
E. Seevinck, “Companding current-mode integrator: A new circuit principle for continuous-time monolithic Şlters”, Electronics Letters, Vol. 26, No. 24, pp. 2046–2047, 1990.
D. R. Frey, “State space synthesis of log domain Şlters”, IEEE International Symposium on Circuits and Systems , pp. 481–484, 1997.
D. R. Frey, “Log-domain Şltering: an approach to current mode Şltering”, IEE Proc.-G, Circuits Devices and Systems , Vol. 140, No. 6, pp. 406–416, 1993.
D. R. Frey, “Exponential state-space Şlters: A generic current-mode design strategy”, IEEE Trans. on Circuits and Systems-I: Fundamental Theory and Application, Vol. 43, pp. 34–42, 1996.
C. Toumazou, J. Ngarmnil, T.S Lande, “Micropower log-domain Şlter for electronic cochlea”, Electronics Letters, Vol. 30, No. 22, pp. 1839–1841, 1994.
M. H. Eskiyerli, A. J. Payne, C. Toumazou , “State space synthesis of integrators based on the MOSFET square law”, Electronics Letters, Vol. 32, No. 6, pp. 505–506. 1996.
R. Schaumann, M. E. V Valkenburg. Design of analog Şlters.Oxford: Oxford University Press; 2001.
S. Ozoguz, T. M. Abdelrahman, A. S. Elwakil, “Novel Approximate Square-Root Domain All-pass Filter with Application to Multiphase Oscillators”, Analog Integrated Circuits and Signal Processing, Vol. 46, No. 3, pp. 297– , 2006
A. Kırcay, & U. Cam, A novel Şrst-order log-domain all-pass Şlter, Int. Journal of Electronics and Communications (AEUE), Vol. 60, No. 6, pp. 471–474, 2006.
K. Bult, A. Wallinga, “A class of analog CMOS circuits based on the square-law characteristic of an MOS transistor in saturation”, IEEE Journal of solid-state circuits, Vol. 22, No. 3, pp. 357–365, 1987.
G. Yu, C. Huang, B. Liu, J. Chen, “Design of Square-Root Domain Filters”, Analog Integrated Circuits and Signal Processing, Vol. 43, pp. 49–59, 2005.