Low phase spurious frequency synthesis method

A technology of frequency synthesis and frequency synthesizer, applied in automatic control of power, electrical components, etc., can solve the problem of spurious index, spurious index does not meet the requirements, frequency synthesizer-related and uncorrelated interference cannot be fully expected, etc. , to achieve the effect of reducing the difficulty of design, reducing the difficulty of design and debugging, and reducing the difficulty of debugging

Inactive Publication Date: 2007-10-31
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

For the determined frequency configuration scheme, another important indicator of the signal spectrum purity—spurs, although the configuration algorithm has been considered and measures are taken to achieve the design goal, however, due to the impossibility of related and unrelated interference received by the frequency synthesizer It is fully expected that once there is interference that cannot be eliminated by the algorithm, the spurious index may not meet the requirements; at this time, the debugging of the frequ

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[0034] The following takes a triple-adjusted frequency synthesis scheme as an example to illustrate the implementation of the present invention.

[0035] The present invention is a new triple-adjusted frequency synthesis method based on multiple adjustments and flexible configuration developed on the basis of the triple-adjusted frequency synthesis scheme completed by the inventor. The given embodiment is also based on an embodiment of the original technical solution.

[0036] The implementation example of the original technical solution is an 8mm frequency agile frequency synthesizer developed by the inventor. Its main technical indicators are: frequency range 35GHz±200MHz, frequency step 2MHz, phase noise L (1KHz) dB ≤-87dBc / Hz, spurious Φ s (f)≤-55dBc, the frequency conversion time of the whole frequency band≤15μS. This scheme designs the phase-locked loop in the X frequency band, and then passes 4 times the frequency to the 8MM frequency band; combines the DDS and PLL schemes ...

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Abstract

The invention discloses a low phase stray frequency synthesizing method and application. The frequency distribution relationship of the synthesizing scheme is definite in current technique for definite output frequency; the invention changes that situation, uses character that any output frequency may multiple distribution relationships in frequency synthesizing scheme of multiple adjustments, on precondition of ensure to obtain the output frequency, by detecting output signal (by phase noise automatic detecting system), choosing best distribution relationship of frequency purity especially stray index, and storing it into RAM/ROM. When using the frequency synthesizer, corresponding frequency relationship is read out from the RAM/ROM in checking table mode to achieve purpose of designing high distinguishability, low stray low phase noise agility frequency changing microwave millimeter wave frequency synthesizer, so the performance of the microwave millimeter wave frequency synthesizer is increased, specially the debugging difficulty of stray index of frequency synthesizer is decreased greatly.

Description

technical field [0001] The invention belongs to the technical field of frequency synthesis, in particular to a simple and practical method for generating frequency synthesis signals. Background technique [0002] Frequency synthesis technology refers to the technology that realizes the linear operation of one or more reference signal sources with high frequency stability and accuracy through the frequency domain to generate a large number of discrete frequencies with the same stability and accuracy, and realizes the circuit of frequency synthesis called a frequency synthesizer. The main technical indicators of a frequency synthesizer usually include: output frequency range, minimum frequency step (also known as frequency interval), spectral purity (including phase noise and phase spurs), frequency switching time (also known as frequency conversion time, frequency hopping time ). Due to the high technical difficulty and the increasingly high requirements for it, frequency s...

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Application Information

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IPC IPC(8): H03L7/197
Inventor 蔡竟业杨远望徐锐敏延波谢小强
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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