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A new low-power sigma-delta modulator with the reduced number of op-amps for speech band applications

Safarian, A. Q ; Sharif University of Technology | 2003

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  1. Type of Document: Article
  2. Publisher: 2003
  3. Abstract:
  4. An area and power-efficient second order sigma-delta modulator is presented. At system level, we propose a new single-loop single-stage modulator that uses only one class-AB op-amp to realize a second order noise shaping for speech band applications. The modulator shows 86 dB DR in 4 kHz speech bandwidth. It consumes 125 μw from a 2.5 V supply
  5. Keywords:
  6. Delta-sigma modulation ; Frequency ; Signal to noise ratio ; Noise reduction ; Quantization ; Capacitors ; Filters ; Operational amplifiers ; Speech ; Noise shaping
  7. Source: Proceedings of the 2003 IEEE International Symposium on Circuits and Systems, Bangkok, 25 May 2003 through 28 May 2003 ; Volume 1 , 2003 , Pages I1033-I1036 ; 02714310 (ISSN)
  8. URL: https://ieeexplore.ieee.org/document/1205743