Low-phase noise microwave local oscillation generating device and method

A technology of low phase noise and generating device, applied in the field of low phase noise microwave local oscillator generation and low phase noise microwave local oscillator generating device, can solve the problems of difficult phase noise index of broadband microwave signals, etc., and achieve the effect of improving phase noise index

Active Publication Date: 2016-01-13
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

Therefore, subject to the F S Sampling the influence of the phase noise of the sample oscillator signal, and fur

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  • Low-phase noise microwave local oscillation generating device and method
  • Low-phase noise microwave local oscillation generating device and method
  • Low-phase noise microwave local oscillation generating device and method

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[0066] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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.

[0067] The near-carrier phase noise of the wideband low-noise frequency synthesis method currently used is limited by the phase noise of the sampled oscillator signal and the harmonic sampling times in the loop. Since the phase noise index of the sampled oscillator signal has been difficult to improve, if the deterioration of the phase noise index in the harmonic sampling link cannot be reduced, the phase noise index of the final synthesized broadband microwave...

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Abstract

The invention provides a low-phase noise microwave local oscillation generating device. After a broadband microwave oscillator feedback signal passes by a broadband microwave signal conditioning circuit, down mixing is carried out on the broadband microwave oscillator feedback signal and a local oscillation signal of a certain frequency of a high-purity down-conversion local oscillation group to convert the broadband microwave oscillator feedback signal from a microwave frequency band with higher frequency into a radio frequency band with lower frequency, and then the broadband microwave oscillator feedback signal is mixed with low-noise radio frequency local oscillation, phase discrimination is carried out on a mixed output middle frequency signal and a reference signal from a fractional frequency-division phase-locked loop, and a phase discrimination output is added to a control end of a broadband microwave oscillator after passing by a loop integrator, so that necessary low-phase noise microwave local oscillation is output. The low-phase noise microwave local oscillation generating device provided by the invention overcomes the technical bottleneck that in a sampling mixing method adopted in traditional frequency synthesis, near carrier phase nose for synthesizing the local oscillation signal is constrained by sampling local oscillation phase noise, and a phase noise index of the microwave synthesis local oscillation signal is further improved.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to a low-phase-noise microwave local oscillator generation device, and also to a low-phase-noise microwave local oscillator generation method. Background technique [0002] Microwave test instruments have high requirements on the frequency resolution, phase noise and spurious indicators of the local oscillator source. Therefore, in the broadband microwave signal frequency synthesis circuit, the local oscillator circuit usually adopts a multi-loop phase-locked structure, such as figure 1 As shown, the traditional scheme generally includes a low-noise reference source circuit, an integer or fractional frequency division phase-locked loop circuit, a low-noise sampling oscillator circuit, a sampling mixing circuit, a sampling intermediate frequency conditioning circuit, a phase detector, a loop integrator, a broadband Microwave oscillators, broadband microwave signal conditioning circui...

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Application Information

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IPC IPC(8): H03L7/099
Inventor 杨东营许建华杜会文闫亚力
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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