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Sigma delta analog to digital converters with adaptive quantization

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2 Author(s)
Ramesh, M.C. ; Dept. of Electr. Eng., Texas Tech. Univ., Lubbock, TX, USA ; Chao, K.S.

The signal to noise ratio (SNR) of conventional sigma delta analog to digital converter (ΣΔADC) reduces with input signal strength. The existing concept of adaptive quantization is applied to the design of ΣΔADCs to improve SNR in situations involving nonstationary signals with a high dynamic range. An adaptive algorithm that is suited particularly well to analog to digital converters and that can be implemented using little additional circuitry is proposed. Simulation results indicate that SNR can be made nearly independent of the signal strength, as expected

Published in:

Circuits and Systems, 1997. Proceedings of the 40th Midwest Symposium on  (Volume:1 )

Date of Conference:

3-6 Aug 1997

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