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1.5-V square-root domain second-order filter with on-chip tuning
De La Cruz-Blas, C.A.; Lopez-Martin, A.J.; Carlosena, A.;
Circuits and Systems I: Regular Papers, IEEE Transactions on
Volume 52,
Issue 10,
Oct. 2005
Page(s):1996
-
2006
Abstract:
A novel square-root domain (SRD) second order filter with automatic tuning control is described. The tuning system is based on a master-slave configuration, where the master is a SRD current-mode magnitude locked loop. The control circuitry allows tuning of the cut-off frequency as well as the quality factor and gain of the filter. The basic building blocks of the complete system are implemented employing a design strategy based on the inherent nonlinear characteristic of Class-AB linear transconductors. A proper biasing scheme in such transconductors leads to operation with very low supply voltages (as low as VGS+2VDSsat). Simulation and numerical results together with measurements from a fabricated prototype in a 0.8-μm CMOS technology are included in order to validate the design technique proposed.
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