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A low phase noise microwave local oscillator generation device and method

A low-phase-noise generation device technology, applied in low-phase-noise microwave local oscillator generation devices and low-phase-noise microwave local-oscillator generation fields, can solve problems such as difficult broadband microwave signal phase noise indicators, and achieve the effect of improving phase noise indicators

Active Publication Date: 2018-04-24
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 further improving the wideband microwave signal F on the basis of this scheme O The phase noise specification of the

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  • A low phase noise microwave local oscillator generation device and method
  • A low phase noise microwave local oscillator generation device and method
  • A low phase noise microwave local oscillator generation device and method

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Embodiment Construction

[0066] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

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

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Abstract

The present invention proposes a low-phase-noise microwave local oscillator generation device. After the broadband microwave oscillator feedback signal passes through the broadband microwave signal conditioning circuit, it is first down-mixed with a local oscillator signal of a certain frequency in the high-purity down-conversion local oscillator group. frequency, convert the feedback signal of the broadband microwave oscillator from the higher frequency microwave frequency band to the lower frequency radio frequency band and then mix it with the low-noise radio frequency local oscillator. The reference signal is phase-detected, and the phase-detection output is added to the control terminal of the broadband microwave oscillator after passing through the loop integrator, so that the output is the required low-phase-noise microwave local oscillator. The invention breaks through the technical bottleneck that the near-carrier phase noise of the synthesized local oscillator signal is restricted by the phase noise of the sample oscillator in the traditional frequency synthesis adopting the sampling mixing method, and further improves the phase noise index of the microwave synthesized local oscillator signal.

Description

Technical field [0001] The present invention relates to the technical field of testing, in particular to a low phase noise microwave local oscillator generating device, and also to a low phase noise microwave local oscillator generating method. Background technique [0002] Microwave testing instruments have high requirements for the frequency resolution, phase noise and spurious of the local oscillator source. Therefore, in the frequency synthesis circuit of broadband microwave signals, the local oscillator circuit usually adopts a multi-loop phase-locked structure, such as figure 1 As shown, traditional solutions generally include low-noise reference source circuits, integer or fractional frequency division phase-locked loop circuits, low-noise sampling local oscillator circuits, sampling mixer circuits, sampling intermediate frequency conditioning circuits, phase detectors, loop integrators, and broadband Microwave oscillator, broadband microwave signal conditioning circuit and...

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Application Information

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Patent Type & Authority Patents(China)
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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