Title :
A design framework for low power analog filter banks
Author :
Furth, Paul M. ; Andreou, Andreas G.
Author_Institution :
Dept. of Electr. & Comput. Eng., New Mexico State Univ., Las Cruces, NM, USA
fDate :
11/1/1995 12:00:00 AM
Abstract :
We detail the design of multiresolution analog filter banks, linear models of cochlear function, with power dissipation being a prime engineering constraint. We propose that a reasonable goodness criterion is the information rate through the system, per watt of power dissipated. Speech applications requiring filter banks with a wide frequency tuning range, from 20 Hz to 20 kHz, and low power consumption make the transconductance-C integrator in subthreshold CMOS the preferable integrator structure. As an example, the dynamic range of a lowpass filter is computed and subsequently used to design a filter bank that models faithfully cochlear micro-mechanics. The power consumption of the entire filter bank is computed from analytical expressions and is estimated as 355 nW, at 68 kb/s overall information rate at the output of the system
Keywords :
CMOS analogue integrated circuits; band-pass filters; continuous time filters; ear; low-pass filters; speech processing; 20 Hz to 20 kHz; 355 nW; 68 kbit/s; cochlear micro-mechanics; design; dynamic range; frequency tuning; information rate; linear model; lowpass filter; multiresolution low power analog filter banks; power consumption; speech processing; subthreshold CMOS; transconductance-C integrator; Design engineering; Energy consumption; Filter bank; Frequency; Information rates; Power dissipation; Power engineering and energy; Power system modeling; Speech; Tuning;
Journal_Title :
Circuits and Systems I: Fundamental Theory and Applications, IEEE Transactions on
