Title :
Adaptive Signal Identification using LMS Filter with an Analog Memory Cell
Author :
de la Cruz-Alejo, Jesus ; Gómez-Castañeda, Felipe ; Moreno-Cadenas, José A. ; Iglesias-Rojas, Juan C.
Author_Institution :
CINVESTAV-IPN, Mexico City
Abstract :
This paper presents the performance of optimal filtering; LMS with a nonvolatile analog memory cell fabricated through 1.2um CMOS process, for the adaptive identification signal problem, where transfer functions are unknown and changing. The memory stores the weight in the filter as charge on the floating gate of a transistor pMOS. The update is linear, using a pulse density modulation scheme by means of tunneling and injection mechanisms. The LMS algorithm is implemented digitally off chip, and it does not require the signal to be piecewise stationary, and requires no manual operation other than selection of the step-size.
Keywords :
CMOS analogue integrated circuits; CMOS memory circuits; adaptive filters; adaptive signal processing; least mean squares methods; transfer functions; CMOS; LMS filter; adaptive signal identification; analog memory cell; floating gate; injection mechanism; optimal filtering; pMOS transistor; pulse density modulation; size 1.2 mum; transfer function; tunneling mechanism; Adaptive filters; Analog memory; CMOS process; Filtering; Least squares approximation; Nonvolatile memory; Pulse modulation; Signal processing; Transfer functions; Tunneling; CMOS; LMS; floating gate;
Conference_Titel :
Electrical and Electronics Engineering, 2007. ICEEE 2007. 4th International Conference on
Conference_Location :
Mexico City
Print_ISBN :
978-1-4244-1166-5
Electronic_ISBN :
978-1-4244-1166-5
DOI :
10.1109/ICEEE.2007.4345041
