Low phase spurious frequency synthesis method

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...

AI Technical Summary

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 frequency synthesizer is very difficult, and in many cases it is even impossible to meet the requirements

[0009] On the whole, because the frequency configuration relationship of the previous frequency synthesis schemes is always fixed, it is difficult to do a good job in the spurious index, and it is difficult to solve the output spurious suppression technology, which has become a bottleneck in the development of the frequency synthesizer. In order to further improve the frequency synthesis Detector spurs pose a challenge

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