Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)
- 2004.07b
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- Pages.1222-1225
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- 2004
A Study on Sigma Delta ADC using Dynamic Element Matching
Dynamic Element Matching을 적용한 Sigma Delta ADC에 관한 연구
- Kim, Hwa-Young (Dept. of Electrical Engineering, Korea University) ;
- Ryu, Jang-Woo (Dept. of Electrical Engineering, Korea University) ;
- Lee, Young-Hee (Dept. of Electrical Engineering, Korea University) ;
- Sung, Man-Young (Dept. of Electrical Engineering, Korea University) ;
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Kim, Gyu-Tae
(Dept. of Electrical Engineering, Korea University)
- Published : 2004.07.05
Abstract
This paper presents multibit Sigma-Delta ADC using noise-shaped dynamic element matching(DEM). 5-bit flash ADC for multibit quantization in Sigma Delta modulator offers the following advantages such as lower quantization noise, more accurate white-noise level and more stability over single quantization. For the feedback paths consisting of DAC, the DAC element should have a high matching requirement in order to maintain the linearity performance which can be obtained by the modulator with a multibit quantizer. The DEM algorithm is implemented in such a way as to minimize additional delay within the feedback loop of the modulator Using this algorithm, distortion spectra from DAC linearity errors are shaped. Sigma Delta ADC achieves 82dB signal to noise ratio over 615H7z bandwidth, and 62mW power dissipation at a sampling frequency of 19.6MHz. This Sigma Delta ADC is designed to use 0.25um CMOS technology with 2.5V supply voltage and verified by HSPICE simulation.