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Optimized passive rubidium atomic frequency scale servo control circuit

A rubidium atomic frequency standard and servo control technology, applied to the automatic control of power, electrical components, etc., can solve the problems of increased strays, increased circuit complexity, and reduced performance indicators of atomic frequency standards, so as to reduce requirements and reduce Phase noise and spurious components, effects in favor of microwave power

Inactive Publication Date: 2013-06-12
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The two signals of 90MHz and 5.3125MHz are simultaneously input to the microwave cavity of the physical system in the rubidium atomic frequency standard for step frequency multiplication. In fact, the method of mixing integer frequency and fractional frequency in the microwave cavity is also used, and a frequency needs to be designed A synthesizer is used to generate a fractional frequency signal of 5.3125MHz, which increases the complexity of the circuit
At the same time, there are side frequency components of 5.3125MHz and its harmonic interval in the microwave cavity, which increases the spurious and reduces the performance index of the atomic frequency standard

Method used

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  • Optimized passive rubidium atomic frequency scale servo control circuit
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  • Optimized passive rubidium atomic frequency scale servo control circuit

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Embodiment Construction

[0033] The invention discloses an optimized passive rubidium atomic frequency standard servo control circuit, the resonant frequency of the non-integer voltage-controlled crystal oscillator adopted is MHz, because the voltage control range of this oscillator is Hz, so the error signal obtained from the deviation correction information obtained from the physical system is used to serve the non-integer voltage-controlled crystal oscillator, which can effectively compensate the total frequency offset generated by the system due to various factors, and realize the closed-loop locking of the whole machine. The frequency synthesizer in the control loop and the addition and mixing unit of the frequency multiplier and the frequency synthesizer are omitted, and the influence of the phase noise and spurs of the frequency synthesizer is eliminated. The non-integer voltage-controlled quartz crystal oscillator adopts a crystal oscillator circuit with frequency doubling function, which im...

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Abstract

The invention discloses an optimized passive rubidium atomic frequency scale servo control circuit. In the optimized passive rubidium atomic frequency scale servo control circuit, a non-integer voltage-controlled crystal oscillator with the resonant frequency being a non-integer MHz and the self-frequency-doubled function; double-frequency signals output by the non-integer voltage-controlled crystal oscillator undergo frequency modulation, frequency multiplication and intracavity microwave frequency multiplication, and then excite atomic ground state 0-0 transition of a physical system; the microwave exciting signals undergo frequency discrimination by utilizing the transition frequency and converted into error electrical signals through a photocell; and the correction voltage is obtainedthrough 122-Hz synchronous phase discrimination and a low-pass filter so as to control the non-integer voltage-controlled crystal oscillator to be in a locking state, thus hyperfine transition frequency stability transferring of rubidium atoms is realized, and accurate and stable output of practical rubidium atom frequency standard signals is realized through double direct digital frequency synthesizers designed by a CPLD (complex programmable logic device). The optimized passive rubidium atomic frequency scale servo control circuit has the advantages of simple structure, convenience for debugging, simplified circuit structure and the like, is beneficial to improvement of the integration degree and miniaturization of rubidium atomic frequency scale, and has an extremely good application prospect.

Description

technical field [0001] The invention relates to the technical field of atomic frequency standards, in particular to an improved and optimized passive rubidium atomic frequency standard servo control circuit, which is suitable for making miniaturized rubidium atomic frequency standards. Background technique [0002] The rubidium atomic frequency standard has the advantages of small volume and power consumption, strong environmental adaptability, high frequency stability and drift rate and other electrical performance indicators. Compared with cesium and hydrogen atomic frequency standards, it has the characteristics of simple structure and low cost, and is still the most widely used atomic frequency standard at present. It is widely used in aerospace, communication, navigation, time-frequency measurement and other fields. Its development trend is high performance and miniaturization. It can be roughly divided into two parts: physical system and circuit system. [0003] In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/26
Inventor 陈永泰张丹王安军周瑜张家明
Owner WUHAN UNIV OF TECH
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