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Frequency synthesis control system and design method

A frequency synthesis and control system technology, applied in the automatic control of power, electrical components, etc., can solve the problems of high cost and large volume of phase-locked loop products

Inactive Publication Date: 2020-04-17
HOHAI UNIV
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Problems solved by technology

Solved the problem of large volume and high cost of phase-locked loop products, and realized the design of a phase-locked frequency synthesis system with wide frequency band, low cost, small volume and storage function

Method used

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  • Frequency synthesis control system and design method
  • Frequency synthesis control system and design method

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Embodiment Construction

[0086] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0087] A frequency synthesis control system based on STM32, the structure is as follows figure 1 As shown, it includes a microcontroller, a frequency synthesis module, a power attenuator, a button module, a liquid crystal display module, a storage management module, and a storage medium; the PC0 port of the microcontroller is connected to the DATA port of the frequency synthesis module, and the microcontroller The PC port of the PC is connected to the IO port of the power attenuator,...

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Abstract

The invention discloses a frequency synthesis control system and a design method, which are used in the field of spectrum measurement of solar radio. For the first time, a mode of combining STM32 as amicrocontroller with ADF4351 for frequency synthesis is proposed, and the method comprises the following steps: adopting a three-order loop filter, so that a phase-locked loop frequency synthesizer with high stability, low phase noise and low spurious is improved; configuring all registers of the frequency synthesizer according to the ADF4351 and a calculation formula of the output frequency of the phase discriminator; finally, normalizing the power value of the synthesized output frequency signal, storing the signal, and designing the frequency output of the high-precision frequency synthesizer. According to the invention, the broadband, high-precision, low-spurious and stable frequency output is provided for the first time through a microcontroller, and meanwhile frequency synthesis output containing floating point types is considered. Compared with an existing frequency synthesizer, the frequency synthesizer has the advantages that the output frequency range is 35.375 MHZ to 4.4 GHZ, and the requirements of more scenes can be met.

Description

technical field [0001] The invention belongs to the technical field of radio frequency phase-locked frequency synthesis, and in particular relates to a frequency synthesis control system and design method. Background technique [0002] Frequency synthesis technology first appeared in the 1930s. According to the order in which frequency synthesizers appeared, they can be divided into the following methods: direct analog frequency synthesis, indirect frequency synthesis and direct digital synthesis. The main methods used in the research of frequency synthesizer are direct digital frequency synthesizer and phase-locked loop frequency synthesis technology. Phase-locked loop frequency synthesizers are divided into integer synthesizers and fractional synthesizers, among which the frequency resolution of integer synthesizers is not high, while fractional synthesizers have higher precision, phase noise and shorter frequency conversion time compared with the former The advantages. ...

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Application Information

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IPC IPC(8): H03L7/099
CPCH03L7/099
Inventor 金玲玲殷兴辉王新君孙威沈飞
Owner HOHAI UNIV
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