Low power mixed analog-digital signal processing

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Low power mixed analog-digital signal processing
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.
Mattias Duppils, Christer Svensson
Added 01 Aug 2010
Updated 01 Aug 2010
Type Conference
Year 2000
Authors Mattias Duppils, Christer Svensson
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