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Extremely Low Power FIR Filter for a Smart Dust Sensor Module
Md. Moniruzzaman, Md. Murad Kabir Nipun, Sajib Roy
Pages - 178 - 183     |    Revised - 15-05-2012     |    Published - 20-06-2012
Volume - 6   Issue - 3    |    Publication Date - June 2012  Table of Contents
STSCL, PDP, CMOS, CSD Multiplier, FIR filter
Digital filters are common components in many applications today, also in for sensor systems, such as large-scale distributed smart dust sensors. For these applications the power consumption is very critical, it has to be extremely low. With the transistor technology scaling becoming more and more sensitive to e.g. gate leakage, it has become a necessity to find ways to minimize the flow of leakage in current CMOS logic. This paper studies sub-threshold source coupled logic (STSCL) in a 45-nm process. The STSCL can be used instead of traditional CMOS to meet the low power and energy consumption requirements. The STSCL style is in this paper used to design a digital filter, applicable for the audio interface of a smart dust sensor where the sample frequency will be 44.1 kHz. A finite-length impulse response (FIR) filter is used with transposed direct form structure and for the coefficient multiplication five-bit canonic signed digit [7] based serial/parallel multipliers were used. The power consumption is calculated along with the delay in order to present the power delay product (PDP) such that the performance of the sub-threshold logic can be compared with corresponding CMOS implementation. The simulated results shows a significant reduction in energy consumption (in terms of PDP) with the system running at a supply voltage as low as 0.2 V using STSCL.
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Mr. Md. Moniruzzaman
- Bangladesh
Mr. Md. Murad Kabir Nipun
- Bangladesh
Mr. Sajib Roy
World University of Bangladesh - Bangladesh