Low-noise high-definition tunable multi-loop frequency synthesizing device and method

Abstract

The invention provides a low-noise high-definition tunable multi-loop frequency synthesizing device, which comprises a reference unit, a decimal loop unit, a fundamental wave loop unit and a frequency division / frequency multiplication channel unit, and is characterized in that the reference unit outputs benchmark reference signals, one path of power division is provided for the decimal loop unit, and another path is provided for the fundamental wave loop unit through 4 frequency division; the decimal loop unit receives tuning data, sample and frequency mixing are performed on output signals of the decimal loop unit and output signals of a VCO (Voltage Controlled Oscillator), phase discrimination is performed on intermediate frequency signals outputted by a sampler and reference signals of the fundamental wave loop unit, acquired error voltage performs presetting on the VCO through the fundamental wave loop unit until the intermediate frequency signals outputted by the sampler are equal to the reference signals of the fundamental wave loop unit, and a loop circuit gets into a locked state; and the frequency division / frequency multiplication channel unit is used for performing frequency division processing on radio frequency signals outputted by the fundamental wave loop unit so as to realize expansion of the signal frequency range. The device provided by the invention realizes a multi-loop frequency synthesizing structure, and can realize generation of tunable signals with high resolution and low noises.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to a multi-ring frequency synthesis device, and also to a multi-ring frequency synthesis method. Background technique [0002] As an important part of signal generation, frequency synthesizer is the source of signal generation. The frequency synthesizer is the basis for realizing the frequency conversion of broadband microwave and millimeter wave signals, which directly determines the phase noise index of the whole machine, and has a great impact on the frequency readout accuracy, residual frequency modulation, spurious and intermodulation distortion, dynamic range, etc. of the whole machine. A key indicator also has an important impact. [0003] The ways of frequency synthesis can be mainly divided into direct frequency synthesis, indirect frequency synthesis and hybrid frequency synthesis. [0004] Direct frequency synthesis uses a high-stability, high-purity reference frequency...

AI Technical Summary

Problems solved by technology

[0007] Hybrid frequency synthesis is also a kind of frequency synthesizer. Among them, DDS and PLL frequency synthesizer are the most widely used. The basic principle is to use the output of DDS as the reference input of PLL to solve the contradiction between frequency resolution and frequency agility, but Its spur treatment is a major problem. If it is not handled properly, there will be leakage spurs, pulse spurs, reference spurs, etc.

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