Charge-based CMOS FIR adaptive filter

Author

Stanacevic, Milutin ; Cauwenberghs, Gert

Author_Institution

Dept. of Electr. & Comput. Eng., Johns Hopkins Univ., Baltimore, MD, USA

Volume

3

fYear

2000

fDate

2000

Firstpage

1410

Abstract

A low-power, high-density CMOS design for an LMS adaptive FIR filter is presented. A combination of charge-based and subthreshold MOS circuits is used for filtering and adaptation. Accurate analog linear filtering is achieved through pulse-width modulation of input signal. A wide dynamic range is obtained by biasing the MOS switched current sources in the subthreshold regime, with the filter coefficients stored on the gates and adapted through a pilot version of the LMS rule. Simulation results with SpectreS verify the linearity and simplicity of the approach

Keywords

CMOS analogue integrated circuits; FIR filters; active filters; adaptive filters; analogue processing circuits; least mean squares methods; low-power electronics; pulse width modulation; switched current circuits; LMS adaptive FIR filter; MOS switched current sources; PWM; SpectreS simulations; analog linear filtering; analog realization; charge-based MOS circuits; filter coefficients; high-density CMOS design; low-power CMOS design; pulse-width modulation; subthreshold MOS circuits; wide dynamic range; Adaptive filters; Circuits; Dynamic range; Filtering; Finite impulse response filter; Least squares approximation; Maximum likelihood detection; Nonlinear filters; Pulse modulation; Space vector pulse width modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2000. Proceedings of the 43rd IEEE Midwest Symposium on

Conference_Location

Lansing, MI

Print_ISBN

0-7803-6475-9

Type

conf

DOI

10.1109/MWSCAS.2000.951477

Filename

951477