A low-noise high-resolution tunable multi-loop frequency synthesis device and method

Abstract

The present invention proposes a low-noise, high-resolution, tunable multi-ring frequency synthesis device, including: a reference unit, a fractional ring unit, a fundamental wave ring unit, and a frequency division and multiplication channel unit; One channel is provided to the fractional ring unit, and the other channel is provided to the fundamental wave ring unit after frequency division by 4; the fractional ring unit receives the tuning data, and its output signal is sampled and mixed with the VCO output signal, and the intermediate frequency signal output by the sampler is combined with the fundamental wave ring unit. The reference signal of the unit is phase-detected, and the obtained error voltage is preset to the VCO through the fundamental wave loop unit until the intermediate frequency signal output by the sampler is equal to the reference signal of the fundamental wave loop unit, and the loop enters the locked state; The frequency channel unit is used to perform frequency division processing on the radio frequency signal output by the fundamental wave ring unit, so as to realize the expansion of the signal frequency range. The invention realizes a multi-ring frequency synthesis structure, and can realize high-resolution, low-noise and tunable signal generation.

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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