The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 2018
Filed:
Jun. 30, 2015
Csmc Technologies Fab1 Co., Ltd., Jiangsu, CN;
Huagang Wu, Jiangsu, CN;
CSMC TECHNOLOGIES FAB1 CO., LTD., Wuxi New District, Jiangsu, CN;
Abstract
A direct digital frequency synthesis method comprises the following steps: calculating, by a phase accumulation module, a first phase according to a frequency synthesis word (S); finding an amplitude value by a preset sinusoidal lookup table according to the first phase (S); finding a second phase by a preset phase lookup table according to the amplitude value (S); if the second phase is less than the first phase, adjusting and outputting the amplitude value (S); or else, outputting the original amplitude value (S); and performing, by a digital-to-analog converter, a digital-to-analog conversion according to the output amplitude value to obtain a sinusoidal wave (S); wherein, for a N-bit phase accumulation module and a D-bit digital-to-analog converter, the preset phase lookup table has 2-1 phase boundary value records corresponding to 0˜2-2 amplitudes, each phase boundary value is stored in N-2 bits. A direct digital frequency synthesizer applying the above method is also disclosed.