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Signal processing method for improving the dynamic range of A/D and D/A converters

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4 Author(s)
Claasen, T. ; Philips Research Laboratories, Eindhoven, Netherlands ; Mecklenbrauker, W. ; Peek, J.B.H. ; van Hurck, N.

A method is described for improving the dynamic range of A/D and D/A converters. In the case of A/D conversion it consists of an analog preprocessing, an A/D converter of B' bits operating at a high sampling rate f's, followed by a digital postprocessing. This system effectively operates as an A/D converter with B > B' bits with low sampling rate fs. A relation between the required oversampling factor N = f's/fsand the improvement in dynamic range (R = B- B') is derived which indicates that for moderate values of R (3 to 5 bits) the oversampling factor must range from 6-15, which is quite acceptable. The method is also applicable to D/A conversion, but then the pre-processing has to be digital and file postprocessing analog.

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Acoustics, Speech and Signal Processing, IEEE Transactions on  (Volume:28 ,  Issue: 5 )