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Erschienen in:
2009 | OriginalPaper | Buchkapitel
Gilbert-Multiplier-Based Parallel 1-D and 2-D Analog FIR Filters for Medical Diagnostics
verfasst von : Rafał Długosz, Vincent Gaudet, Ryszard Wojtyna
Erschienen in: Computers in Medical Activity
Verlag: Springer Berlin Heidelberg
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A novel idea and CMOS implementation of power-efficient 1-D and 2-D finite-impulse-response (FIR) filters based on a current-mode Gilbert-vector-multiplier (GVM) have been proposed. MOS transistors included in the GVM multiplier work in a weak inversion resulting in an ultra low power consumption, with currents as low as several hundred nanoAmps to several microAmps. Due to the proposed multiplier, all output samples of the FIR filters can be calculated in parallel, making the filtration operation very fast. Moreover, the GVM enables a simple normalization of the output samples. As a consequence, not current values but current ratio values are significant here. As an example, a time-domain 1-D 3
rd
order filter has been presented which dissipates 8-
μ
W of power enabling a 2-MHz sampling frequency (
f
S
). Another example is a 2-D filter with the frame resolution of 6x1 pixels that dissipates 7-
μ
W at the data rate of 1 Mframe/s.