Title :
Charge-based CMOS FIR adaptive filter
Author :
Stanacevic, Milutin ; Cauwenberghs, Gert
Author_Institution :
Dept. of Electr. & Comput. Eng., Johns Hopkins Univ., Baltimore, MD, USA
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;
Conference_Titel :
Circuits and Systems, 2000. Proceedings of the 43rd IEEE Midwest Symposium on
Conference_Location :
Lansing, MI
Print_ISBN :
0-7803-6475-9
DOI :
10.1109/MWSCAS.2000.951477
