Title:
DELTA-SIGMA MODULATOR, ELECTRONIC APPARATUS AND METHOD FOR CONTROLLING DELTA-SIGMA MODULATOR
Document Type and Number:
WIPO Patent Application WO/2018/109992
Kind Code:
A1
Abstract:
The present invention effectively suppresses idle tones in a delta-sigma modulator that generates a feedback signal using a digital-to-analog converter. A filter integrates a difference between an input analog signal and a feedback signal and outputs a resultant signal as an integral signal. A preceding-stage quantizer quantizes the integral signal into a digital signal and outputs the digital signal as a preceding-stage output signal. An adder adds a prescribed dithering signal to the preceding-stage output signal and outputs a resultant signal as a subsequent-stage input signal. A subsequent-stage quantizer quantizes the subsequent-stage input signal into a digital signal having a smaller number of bits than the preceding-stage output signal and outputs the digital signal as a subsequent-stage output signal. The digital-to-analog converter converts the subsequent-stage output signal into an analog signal and outputs the analog signal to the filter as a feedback signal.
Inventors:
NAKAMOTO EIICHI (JP)
Application Number:
PCT/JP2017/031532
Publication Date:
June 21, 2018
Filing Date:
September 01, 2017
Export Citation:
Assignee:
SONY SEMICONDUCTOR SOLUTIONS CORP (JP)
International Classes:
H03M3/02
Foreign References:
| US20050128111A1 | 2005-06-16 | |||
| JPS6484920A | 1989-03-30 |
Other References:
VICTOR RODOLFO GONZALEZ-DIAZ ET AL.: "Efficient Dithering in MASH Sigma-Delta Modulators for Fractional Frequency Synthesizers", IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS-I:REGULAR PAPERS, vol. 57, no. 9, September 2010 (2010-09-01), pages 2394 - 2403, XP011306863
SHUAI ZHOU ET AL.: "A Spur-Reduction Delta-Sigma Modulator with Efficient Dithering for Franctional Frequency Synthesizer, Advanced Information Management", COMMUNICATES, ELECTRONIC AND AUTOMATION CONTROL CONFERENCE (IMCEC), 5 October 2016 (2016-10-05), pages 1473 - 1476, XP055510259
SHUAI ZHOU ET AL.: "A Spur-Reduction Delta-Sigma Modulator with Efficient Dithering for Franctional Frequency Synthesizer, Advanced Information Management", COMMUNICATES, ELECTRONIC AND AUTOMATION CONTROL CONFERENCE (IMCEC), 5 October 2016 (2016-10-05), pages 1473 - 1476, XP055510259
Attorney, Agent or Firm:
MARUSHIMA, Toshikazu (JP)
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