Local oscillator circuit and local oscillation signal generation method

A local oscillator circuit and output signal technology, applied in the microwave field, can solve the problems of low phase noise and achieve high reliability, good phase noise index, and easy debugging

Inactive Publication Date: 2013-09-18
CHINA ELECTRONIS TECH INSTR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention proposes a local oscillator circuit and a local oscillator signal generation method, which solves the problem that the prior art cannot realize the second local oscillator with low phase noise and simple circuit

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  • Local oscillator circuit and local oscillation signal generation method

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Embodiment Construction

[0027] 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 creative efforts fall within the protection scope of the present invention.

[0028] In the implementation method of the second local oscillator in the existing microwave signal analyzer, the shortcoming of the frequency doubling method is that the far-end phase noise is relatively poor, and it often cannot meet the requirements in a high-performance signal analyzer; although the microwave phase-locking method overcomes the The disadvantage of the remote phase noise difference, but a microwave phase-locked loop is added, the circuit is compli...

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Abstract

The invention discloses a local oscillator circuit and a local oscillation signal generation method. A second low-phase noise local oscillator circuit is implemented by utilizing low-phase noise frequency doubling and microwave-band extremely-narrow band filtering. The local oscillator circuit is simple and easy to debug, only has a through path, and does not have a feedback circuit; an output signal is generated in real time, and capturing and locking time is not required; and the local oscillator circuit is high in reliability and good in phase noise index.

Description

technical field [0001] The invention relates to the microwave field, in particular to a microwave signal analyzer. Background technique [0002] In modern microwave signal analyzers, a superheterodyne structure with multi-stage frequency conversion is usually used, so multiple different types of local oscillator signals need to be provided inside the analyzer. The second local oscillator is a microwave point-frequency signal source with high stability and low phase noise, and it is also one of the decisive factors for the phase noise index of the whole machine. In previous signal analyzers, there are generally two implementation methods for the second local oscillator scheme, which are frequency doubling method and microwave phase-locking method. [0003] The frequency doubling method is to use a crystal oscillator with low phase noise to directly multiply the frequency to the microwave signal, and then use it as the second local oscillator signal after filtering and amplif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/18H03L7/099
Inventor 闫亚力杜会文杜以涛郭小文
Owner CHINA ELECTRONIS TECH INSTR CO LTD
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