Modularized frequency synthesizing method based on direct digital and direct analogue combination

A digital frequency synthesis and frequency synthesis technology, applied in the direction of automatic power control, electrical components, etc., to achieve good versatility and scalability, improve performance, and achieve the effect of modularization

Inactive Publication Date: 2010-11-24
中国兵器工业第二〇六研究所
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] The problem to be solved by the present invention is to provide a solution for the defects of the frequency conversion time, frequency resolution, phase noise, spurious level, bandwidth, volume and cost that exist in th

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  • Modularized frequency synthesizing method based on direct digital and direct analogue combination
  • Modularized frequency synthesizing method based on direct digital and direct analogue combination
  • Modularized frequency synthesizing method based on direct digital and direct analogue combination

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Embodiment Construction

[0029] figure 1 A preferred embodiment of the invention is given. like figure 1 As shown, there are 5 intermediate frequency frequency standard signals output by the direct digital frequency synthesizer. In this embodiment, the output frequency band of the direct digital frequency synthesizer is selected in the P-band, and its frequency interval ΔF should be equal to the requirement of the user for the output frequency interval of the frequency synthesizer. In this embodiment, the frequency interval ΔF is 20MHz, so the bandwidth of the P-band intermediate frequency frequency standard signal output by the direct digital frequency synthesizer is exactly 80MHz, and the 5 select 1 (M selects 1) switch filter component is used to filter out 5 intermediate frequency frequency standard signals spurious level. The input reference clock F required by the direct digital frequency synthesizer DDS It is obtained by direct multiplication of a highly stable crystal oscillator with a fre...

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Abstract

The invention provides a modularized frequency synthesizing method based on direct digital and direct analogue combination, including the following steps: (1) direct digital frequency synthesizing method is adopted to generate M intermediate frequency marker signals with frequency interval of deltaF and bandwidth of (M-1)deltaF, namely F1, F1+deltaF, F1+2deltaF, ..., F1+(M-1)deltaF; (2) frequency shifting method is adopted to shift the frequencies of the M intermediate frequency marker signals generated in the step (1) to microwave frequency band, so as to generate M microwave local oscillation signals with frequency interval of deltaF and bandwidth of (M-1)deltaF, namely F2, F2+deltaF, F2+2deltaF, ..., F2+(M-1)deltaF; (3) indirect analogue frequency synthesizing method is adopted to generate N radio frequency marker signals with frequency interval of MdeltaF and bandwidth of (N-1)MdeltaF, namely F3, F3+MdeltaF, F3+2MdeltaF, ..., F3+(N-1)MdeltaF; (4) M microwave local oscillation signals generated in step (2) and N radio frequency marker signals generated in step (3) are subject to mixing, so as to obtain M*N frequency synthesis signals with frequency interval of deltaF and bandwidth of (MN-1)deltaF, namely F2+F3, F2+F3+deltaF, F2+F3+2deltaF, ..., F2+F3+(MN-1)deltaF, and the frequency synthesis signals are output. The invention realizes extremely rapid frequency conversion, extremely low phase noise and extremely low spurious level with low cost.

Description

technical field [0001] The invention belongs to the technical field of radar frequency synthesis, in particular to a modular frequency synthesis method based on the combination of direct digital frequency synthesis and direct analog. Applied in the design of radar frequency synthesizer, the performance of the frequency synthesizer can be greatly improved, and it is common to radar frequency synthesizers in various frequency bands, so that the hardware implementation circuit has good versatility and scalability. Background technique [0002] The frequency synthesizer is the heart of the modern electronic system and also the key component of the radar system, its quality directly affects the performance index of the radar system. [0003] Frequency synthesis is the combination of system components that generate one or more frequencies from one or several reference frequency sources. Frequency synthesis technology has a history of nearly 80 years. Early frequency synthesizers ...

Claims

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Application Information

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IPC IPC(8): H03L7/18
Inventor 张春荣余铁军庞建涛侯涛任亚欣饶睿楠
Owner 中国兵器工业第二〇六研究所
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