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Low-phase noise frequency synthesizer and implementation method of local oscillator

A technology of low phase noise and frequency synthesizer, applied in the direction of automatic power control, electrical components, etc., can solve the problems of output frequency error, frequency deviation, etc., and achieve the effect of low phase noise

Inactive Publication Date: 2021-02-26
WUHAN BINHU ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the processing error of sapphire and resonator size will lead to the error of the output frequency, that is, the frequency offset. Under the current processing accuracy, the error is in the range of ±1%, and frequency compensation is required.

Method used

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  • Low-phase noise frequency synthesizer and implementation method of local oscillator
  • Low-phase noise frequency synthesizer and implementation method of local oscillator

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Embodiment Construction

[0012] Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0013] Such as figure 1 and figure 2 As shown, a low-phase-noise frequency synthesizer with multiple frequency points and agile frequency, including a low-temperature oscillation circuit, a room temperature oscillation circuit, a main control unit, a microwave switch, a power divider, a local oscillator frequency synthesis circuit, a DDS circuit and Two local oscillator frequency synthesis circuits. The main control unit collects the temperature of the low-temperature Dewar in the low-temperature oscillating circuit and the voltage output by the detector, so as to control the operating status of the microwave switch and the constant temperature crystal oscillator. The outputs of the low temperature oscillating circuit and the normal temperature oscillating circuit are connected to the microwave switch, the microwave switch is connec...

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Abstract

The invention belongs to the technical field of analog signal processing, and particularly relates to a low-phase noise frequency synthesizer and an implementation method of a local oscillator. A high-temperature superconducting sapphire oscillator is used as a reference source, a clock generated by the high-temperature superconducting sapphire oscillator is used as a reference clock, and a directfrequency synthesis technology and a DDS are combined to synthesize a local oscillator I, a local oscillator II and other clocks. The DDS is used for compensating the frequency error of the sapphireoscillator, expanding a local oscillator to a plurality of frequency points, and realizing frequency agility. A crystal oscillator reference source is reserved, and a reference clock close to a reference clock generated by a sapphire oscillator is generated in a direct frequency synthesis mode and is reserved before the sapphire oscillator is started. Phase noise can be improved.

Description

technical field [0001] The invention belongs to the technical field of analog signal processing, and in particular relates to a low phase noise frequency synthesizer and a method for realizing a local oscillator. Background technique [0002] The frequency synthesizer is used to provide coherent one oscillator, two local oscillators and other required clocks for the radar system. It is required that the synthesized local oscillator and each clock have low phase noise, and the local oscillator has multiple frequency points and can fast frequency hop. [0003] The basic working principle of the frequency synthesizer is: the reference clock is generated by the reference source, the power is divided into multiple channels, and the direct frequency synthesis, phase-locked loop and other synthesis methods are used respectively to synthesize one local oscillator, two local oscillators and other clocks. The choice of reference source and frequency synthesis method determines the ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/18H03L7/093H03L7/083H03L7/099
CPCH03L7/18H03L7/093H03L7/083H03L7/0992
Inventor 沈金成辛鹏罗华许卫
Owner WUHAN BINHU ELECTRONICS
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