Title :
Low power mixed analog-digital signal processing
Author :
Duppils, Mattias ; Svensson, Christer
Author_Institution :
Dept. of Phys., Linkoping Univ., Sweden
Abstract :
The power consumption of mixed-signal systems featured by an analog front-end, a digital back-end, and with signal processing tasks that can be computed with multiplications and accumulations, is analyzed. An implementation is proposed, composed of switched-capacitor mixed analog/digital multiply-accumulate units in the analog front-end, followed by an A/D converter. This implementation is shown to be superior in respect of power consumption compared to an equivalent implementation with a high-speed A/D converter in the front-end, to execute signal processing tasks that include decimation. The power savings are only due to relaxed requirement on A/D conversion rate, as a direct consequence of the decimation. In a case study of a narrowband FIR filter, realized with four multiply-accumulate units, and with a decimation factor of 100; power saving is 54 times. Implementation details are given, the power consumption, and the thermal noise are analyzed.
Keywords :
CMOS integrated circuits; FIR filters; analogue-digital conversion; integrated circuit noise; mixed analogue-digital integrated circuits; power consumption; switched capacitor networks; thermal noise; A/D conversion rate; CMOS; FIR filter; analog front-end; analog-digital signal processing; decimation factor; digital back-en; power consumption; power saving; power savings; signal processing; switched-capacitor mixed A/D multiply-accumulate units; thermal noise; Analog-digital conversion; CMOS analog integrated circuits; CMOS digital integrated circuits; CMOS process; CMOS technology; Digital signal processing; Energy consumption; Physics; Signal processing; Switching converters;
Conference_Titel :
Low Power Electronics and Design, 2000. ISLPED '00. Proceedings of the 2000 International Symposium on
Print_ISBN :
1-58113-190-9
DOI :
10.1109/LPE.2000.155254
