A stereo audio chip using approximate processing for decimation and interpolation filters
- 1 January 2000
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Journal of Solid-State Circuits
- Vol. 35 (1) , 45-55
- https://doi.org/10.1109/4.818919
Abstract
A stereo audio chip uses approximate processing techniques in the digital decimation and interpolation filters to reduce its active power dissipation. One pair of analog-to-digital (A/D) converters and one pair of digital-to-analog (D/A) converters have been integrated in a die area of 10.22 mm/sup 2/ in a 0.5 /spl mu/m CMOS technology. The total power dissipation of these converters without power management is 200 mW when operated from a 5-V power supply. When the signal is fully active, power reductions of 36% for decimation and 17% for interpolation over fixed-order filters are demonstrated. When the signal is 40 dB below overload, power reductions of 67% for decimation and 44% for interpolation over fixed-order filters are observed. The power reductions are 83.1% for A/D converters, and 82.7% for D/A converters, when the signal is silent for a period of time.Keywords
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