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MASH 4-0 CTΔΣM with Fully Digital Quantization Noise Reduction Algorithm

  • Qiyuan Liu
  • Alexander Edward
  • Carlos Briseno-Vidrios
  • Jose Silva-Martinez
Chapter

Abstract

This chapter presents a fully digital quantization noise reduction algorithm (DQNRA) for a multistage noise-shaping (MASH) 4-0 continuous-time ΔΣ modulator (CTΔΣM). The presented algorithm is robust to process voltage and temperature (PVT) variations and overcomes the quantization noise leakage issues. A CTΔΣM employs a 7-bit quantizer, from which the four most significant bits are used in a fourth-order ΔΣM loop. The remaining three least significant bits are used for the DQNRA to improve the quantization noise cancelation. The presented MASH 4-0 CTΔΣM prototype was implemented in 130 nm CMOS technology. The modulator’s total power consumption is 20 mW and the 7-bit quantizer consumes only 6 mW operating at 500 MHz. For this prototype, the DQNRA algorithm improved the modulator’s signal-to-noise and distortion ratio (SNDR) from 69 to 75 dB within a 15 MHz bandwidth.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Qiyuan Liu
    • 1
  • Alexander Edward
    • 2
  • Carlos Briseno-Vidrios
    • 3
  • Jose Silva-Martinez
    • 4
  1. 1.Qualcomm IncorporatedTempeUSA
  2. 2.Intel CorporationHillsboroUSA
  3. 3.Silicon Laboratories IncorporatedAustinUSA
  4. 4.Department of Electrical and Computer EngineeringTexas A&M UniversityCollege StationUSA

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