Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)
- 2003.11c
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- Pages.950-953
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- 2003
Sigma-Delta A/D Converter for ADSL Modems
ADSL 모뎀용 시그마-델타 아날로그/디지털 변환기
- Published : 2003.11.21
Abstract
In this paper, sigma-delta A/D converter for ADSL modems using oversampling technique is designed. Conventionally, the oversampling A/D converter is consist of opamps, switched capacitors, quantizers, infernal D/A converters, and decimation filters. 3-bit flash A/D converter, 3-bit thermometer-based D/A converters, and sub-blocks are used for high speed operation. HSPICE simulator and CADENCE tool are used for verification and layout of the designed modulator. The internal A/D converter and D/A converters are operated at 130 MHz. In design of decimation filter Matlab is used for calculating coefficients and ModelSim and VHDL are used for design.