A 3-V, 2%-mW multibit current-mode ΣΔ DAC with 100 dBdynamic range |
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Authors: | Hamasaki T. Shinohara Y. Terasawa H. Ochiai K. Hiraoka M. Kanayama H. |
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Affiliation: | Burr-Brown Ltd., Atsugi; |
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Abstract: | The area ratio of analog to digital for mixed-mode chip has been inversely proportional to the process design rule for a given dynamic range objective, in contradiction to the LSI trend. This paper presents a design approach to realize a high degree of size reduction with process design rules for analog circuitry and a signal processing architecture for digital circuitry. A five-level current-mode ΣΔ digital-to-analog converter (DAC) system reveals full scale total harmonic: distortion plus noise (THD+N) of -90 dB and dynamic-range of 100 dB at 3 V (low power of 22 mW). Analog-area down-scaling can be accomplished by this architecture to be 1.09 mm2, using 0.6-μm double-poly double-metal (DPDM) CMOS. For the digital filter, a pipeline instruction sequence with multiplierless architecture also gives small area of 1.98 mm2 |
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