Optimized passive rubidium atomic frequency standard servo control circuit

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 ...

AI Technical Summary

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

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