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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
  • Description
  • Claims
  • Application Information

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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 conversion, the conversion and storage speed of a single ROM is often much lower than that of the phase accumulator and data The speed of the analog-to-analog converter severely limits the speed of the direct digital synthesizer

Method used

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be noted that, in the drawings or descriptions of the specification, similar or identical parts all use the same figure numbers. Implementations not shown or described in the accompanying drawings are forms known to those of ordinary skill in the art. Additionally, while illustrations of parameters including particular values ​​may be provided herein, it should be understood that the parameters need not be exactly equal to the corresponding values, but rather may approximate the corresponding values ​​within acceptable error margins or design constraints. The directional terms mentioned in the embodiments, such as "upper", "lower", "front", "rear", "left", "right", etc., are only referring to the directions of the...

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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...

Claims

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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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