Frequency synthesizer capable of achieving low phase noise, low stray and quick change

A low-spur, low-phase-noise technology, applied in automatic control of power, electrical components, etc., can solve problems such as complex circuits, difficulty in meeting frequency agility, and difficulty in controlling stray indexes, and achieve high-phase noise index, spurious The effect of diffuse inhibition

Inactive Publication Date: 2014-06-25
SICHUAN JIUZHOU ELECTRIC GROUP
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Problems solved by technology

In practical engineering applications, good phase noise can be obtained by using traditional direct digital frequency synthesis, but a large number of frequency mixing and frequency multiplication links are required, nonlinear components are introduced, the circuit is complex, and the spurious index is difficult to control; the PLL method can obtain High spurious suppression, but the frequency hopping speed is usually on the order of 100??s, which is difficult to meet the requirements of frequency agility; if the direct digital synthesis method is used, the frequency hopping speed can meet the requirements, but the spurious index is difficult to control

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  • Frequency synthesizer capable of achieving low phase noise, low stray and quick change
  • Frequency synthesizer capable of achieving low phase noise, low stray and quick change

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Embodiment Construction

[0021] The design concept of the present invention is: through the innovative phase noise prediction method, reasonably select the device to achieve low phase noise; through the frequency preset of the phase-locked loop and the switching of the microwave switch, the frequency can be quickly changed; at the same time, a special isolation structure is adopted, and Reasonable distribution of signal amplitude in the cavity structure ensures low spurious frequency synthesizer. The frequency synthesizer realizing multi-frequency output satisfies the requirements of low phase noise, low spurious and quick change.

[0022] The technical solution of the present invention will be described in detail below.

[0023] Such as figure 1 As shown, the present invention includes a constant temperature crystal oscillator, a first power divider, a second power divider, a first primary radar local oscillator ring, a second primary radar local oscillator ring, a secondary radar local oscillator r...

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Abstract

The invention provides a frequency synthesizer capable of achieving low phase noise, low stray and quick change. An innovative phase noise prediction method is adopted, devices are reasonably selected, and the low phase noise is achieved; by means of phase-locked loop frequency presetting and microwave switch switching, frequency is quickly changed; meanwhile, a special isolation structure is adopted, reasonable distribution of the signal amplitude in a cavity structure is utilized, and accordingly low stray of the frequency synthesizer is guaranteed. The frequency synthesizer achieving multi-frequency output meets the requirements of the low phase noise, low stray and quick change.

Description

technical field [0001] The invention relates to the field of frequency synthesizers, in particular to a microwave frequency synthesizer with low phase noise, low stray and quick change. Background technique [0002] Frequency synthesizer is the core component of electronic equipment such as radar and communication, and its main technical indicators include phase noise, spurious suppression, frequency hopping speed, etc. The level of the phase noise of the frequency synthesizer directly determines the magnitude of the sideband signal amplitude of the transmitted spectrum. The sidelobe of the high sideband signal after pulse compression will cover up the weak target detection and reduce the distance detection performance of the radar; When the dispersion level is high, pairs of false signals will be generated in the received echo, and the width of the main lobe will be widened to reduce the distance resolution of the radar; modern radars face complex electromagnetic environmen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/16
Inventor 冯江华
Owner SICHUAN JIUZHOU ELECTRIC GROUP
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