Title:
DIRECT DIGITAL SYNTHESIZING METHOD AND DIRECT DIGITAL SYNTHESIZER
Document Type and Number:
WIPO Patent Application WO/2016/008362
Kind Code:
A1
Abstract:
A direct digital synthesizing method, comprising the following steps: a phase accumulation module calculates based on a frequency synthesizing word and obtains a first phase (S101); searching a preset sine lookup table for an amplitude value according to the first phase (S102); searching a preset phase lookup table for a second phase according to the amplitude value (S103); if the second phase is less than the first phase, then adjusting the amplitude value for output (S105); otherwise, outputting the original amplitude value (S106); a digital-analog converter performs digital-analog conversion on the outputted amplitude value to obtain a sine wave output (S107). For an N-bit phase accumulation module and a D-bit digital-analog converter, the preset phase lookup table contains 2D-1-1 phase boundary value records corresponding to 0-2D-1-2 amplitudes, each phase boundary value being stored in N-2 bits. Also disclosed is a direct digital synthesizer (10) employing the above method.
Inventors:
WU HUAGANG (CN)
Application Number:
PCT/CN2015/082902
Publication Date:
January 21, 2016
Filing Date:
June 30, 2015
Export Citation:
Assignee:
CSMC TECHNOLOGIES FAB1 CO LTD (CN)
International Classes:
H03L7/24
Foreign References:
| CN102324933A | 2012-01-18 | |||
| CN101149630A | 2008-03-26 | |||
| CN102082571A | 2011-06-01 | |||
| US20070164793A1 | 2007-07-19 |
Attorney, Agent or Firm:
ADVANCE CHINA IP LAW OFFICE (CN)
广州华进联合专利商标代理有限公司 (CN)
广州华进联合专利商标代理有限公司 (CN)
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