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A 65-nm low-noise low-cost ∑Δ modulator for audio applications

Liang Guo, Liao Lu, Luo Hao, Liu Xiaopeng, Han Xiaoxia and Han Yan

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Abstract: This paper introduces a low-noise low-cost ΣΔ modulator for digital audio analog-to-digital conversion. By adopting a low-noise large-output swing operation amplifier, not only is the flicker noise greatly inhibited, but also the power consumption is reduced. Also the area cost is relatively small. The modulator was implemented in a SMIC standard 65-nm CMOS process. Measurement results show it can achieve 96 dB peak signal-to-noise plus distortion ratio (SNDR) and 105 dB dynamic range (DR) over the 22.05-kHz audio band and occupies 0.16 mm2. The power consumption of the proposed modulator is 4.9 mW from a 2.5 V power supply, which is suitable for high-performance, low-cost audio codec applications.

Key words: Σ Δ modulatorlow-noiselow-costanalog-to-digital converter

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    Received: 03 December 2014 Revised: 13 September 2011 Online: Published: 01 February 2012

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      Liang Guo, Liao Lu, Luo Hao, Liu Xiaopeng, Han Xiaoxia, Han Yan. A 65-nm low-noise low-cost ∑Δ modulator for audio applications[J]. Journal of Semiconductors, 2012, 33(2): 025005. doi: 10.1088/1674-4926/33/2/025005 Liang G, Liao L, Luo H, Liu X P, Han X X, Han Y. A 65-nm low-noise low-cost ∑Δ modulator for audio applications[J]. J. Semicond., 2012, 33(2): 025005. doi: 10.1088/1674-4926/33/2/025005.Export: BibTex EndNote
      Citation:
      Liang Guo, Liao Lu, Luo Hao, Liu Xiaopeng, Han Xiaoxia, Han Yan. A 65-nm low-noise low-cost ∑Δ modulator for audio applications[J]. Journal of Semiconductors, 2012, 33(2): 025005. doi: 10.1088/1674-4926/33/2/025005

      Liang G, Liao L, Luo H, Liu X P, Han X X, Han Y. A 65-nm low-noise low-cost ∑Δ modulator for audio applications[J]. J. Semicond., 2012, 33(2): 025005. doi: 10.1088/1674-4926/33/2/025005.
      Export: BibTex EndNote

      A 65-nm low-noise low-cost ∑Δ modulator for audio applications

      doi: 10.1088/1674-4926/33/2/025005
      • Received Date: 2014-12-03
      • Accepted Date: 2011-07-22
      • Revised Date: 2011-09-13
      • Published Date: 2012-01-20

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