Reduced-sample-rate sigma–delta modulation using recursive deconvolution

✍ Scribed by Birru, Dagnachew

• Book ID: 101224880
• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 399 KB
• Volume: 25
• Category: Article
• ISSN: 0098-9886
• DOI: 10.1002/(sici)1097-007x(199709/10)25:5<419::aid-cta982>3.0.co;2-1

✦ Synopsis

A reduced-sample-rate sigma-delta modulation method using a recursive deconvolution technique for application in digitalto-analogue conversion is proposed and analysed. The method allows the sigma-delta modulators to operate at a sampling rate which is lower than the output bitstream rate by an integer factor. With the proposed in-loop mapping algorithm to map an m-bit sample to qb-bit samples, the total system inherits the advantages of a multilevel quantization conventional modulator in the digital part with regard to suppression of tones, improved stability and low power, while its output remains single-bit. The e ectiveness of the technique is illustrated using simulations for second-and third-order modulators.