Direct digital frequency synthesizer

A digital frequency synthesis and direct technology, applied in the field of microelectronics, can solve the problems of low conversion and storage speed, restricting the speed of direct digital frequency synthesizer, etc., and achieve the effect of reducing clock speed requirements, efficient and fast chip design, and power consumption optimization.

Inactive Publication Date: 2014-06-25
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0008] In the process of realizing the present invention, the applicant found that the existing direct digital frequency synthesizer has the following technical defects: due to the use of a single ROM for data conversio

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[0030] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to specific embodiments and drawings. It should be noted that, in the drawings or description of the specification, similar or identical parts use the same drawing numbers. The implementations not shown or described in the drawings are those known to those of ordinary skill in the art. In addition, although this article may provide demonstrations of parameters including specific values, it should be understood that the parameters need not be exactly equal to the corresponding values, but can be approximated to the corresponding values ​​within acceptable error tolerances or design constraints. The directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only directions with reference to the drawings. Therefore, the directional term...

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Abstract

The invention provides a direct digital frequency synthesizer which comprises an accumulator used for accumulating input frequency control words FTW, a multi-channel phase-amplitude conversion module which comprises 2m data processing channels with equal-difference phases, a data selecting and outputting module and a digital to analog converter. In terms of the ith data processing channel, a bias phase FTW*i is added to an accumulation result of the frequency control words output by the accumulator, phase to amplitude conversion is performed on the result, and amplitude digital signals are output. The data selecting and outputting module is used for sequentially selecting the amplitude digital signals from the 2m data processing channels with the equal-difference phases and sending the amplitude digital signals into the follow-up digital to analog converter. The digital to analog converter is used for converting the amplitude digital signals output by the data selecting and outputting module into analog signals and outputting the analog signals. According to the direct digital frequency synthesizer, a manner of connecting the data processing channels in parallel is adopted, and phase-amplitude conversion of multiple channels is performed at the same time, so that the phase-amplitude conversion efficiency is improved, and conversion time is saved.

Description

technical field [0001] The invention relates to the technical field of microelectronics, in particular to a direct digital frequency synthesizer. Background technique [0002] Frequency synthesis technology is one of the key technologies for modern communication electronic systems to achieve high performance indicators. The function realization of many electronic devices directly depends on the performance of the frequency synthesizer used. For communication systems with constant frequency conversion, such as wireless LAN (Wireless LAN), The application of frequency synthesis technology in digital cellular systems and electronic countermeasure systems is particularly important, so people often compare frequency synthesizers to the "heart" of many electronic systems. [0003] figure 1 It is a structural schematic diagram of a direct digital frequency synthesizer in the prior art. Please refer to figure 1 , the direct digital frequency synthesizer includes: a phase accumula...

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Application Information

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IPC IPC(8): H03L7/24
Inventor 袁凌
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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