Title :
Continuous-time LMS adaptive recursive filters
Author :
Johns, David A. ; Snelgrove, W. Martin ; Sedra, Adel S.
Author_Institution :
Dept. of Electr. Eng., Toronto Univ., Ont., Canada
fDate :
7/1/1991 12:00:00 AM
Abstract :
An approach for implementing continuous-time adaptive recursive filters is presented. The resulting filters should be capable of operating on much higher signal frequencies than their digital counterparts since no sampling is required. With respect to implementation problems, the effects of DC offsets are investigated and formulas derived so that these effects can be estimated and reduced. It is shown that the DC offset performance is strongly affected by the choice of structure for the adaptive filter. Experimental results from a discrete prototype are given where accurate adaption is observed and DC offset effects are compared to theoretical predictions
Keywords :
adaptive filters; filtering and prediction theory; least squares approximations; DC offsets; LMS; continuous-time adaptive recursive filters; discrete prototype; signal frequencies; Adaptive filters; Analog circuits; Analog computers; Digital filters; Hardware; Laser sintering; Least squares approximation; Prototypes; Sampling methods; Signal processing;
Journal_Title :
Circuits and Systems, IEEE Transactions on