Rubidium atom frequency scale digital phase-locking frequency doubler

Abstract

The invention discloses a rubidium atom frequency standard digital phase locked frequency multiplier. The input terminal of the digital phase locked loop is connected with the output terminal of the rubidium atom frequency standard 10MHz voltage control crystal oscillatory as the output terminal of the frequency multiplier. The output terminal of the digital phase locked loop is connected with the output terminal of the microwave oven amplifier which is connected with the output terminal of the step matching circuit. The output terminal of the step matching circuit as the output terminal of the frequency multiplier is connected with the input terminal of the rubidium atom frequency standard microwave cavity. The phase detector and the digital frequency synthesizer are integrated by AD 9956. The invention adopts digital synthesizer as the fractional divider in which a digital phase locked loop is inserted, sets and modulate the fractional frequency division ratio of the digital synthesizer through the single chip computer thus enabling the direct fractional frequency multiplying and frequency modulation of the frequency multiplier. The invention with a simple structure, high degree of integration, high purity of the spectrum, low phase noise, small stray and high degree of digitalization is easy to modulate and can be used to produce miniaturized rubidium atom frequency standard.

Description

technical field [0001] The invention relates to a rubidium atomic frequency standard, and more specifically relates to a rubidium atomic frequency standard digital phase-locked loop (PLL) radio frequency multiplier, which is suitable for making miniaturized commercial rubidium atomic frequency standard. Background technique [0002] The atomic frequency standard is a device that uses the atomic transition line to lock the voltage-controlled crystal oscillator to provide a high-stable time-frequency signal. It is widely used in communication, navigation and other fields. The rubidium atomic frequency standard has the characteristics of small size, light weight, and low power consumption. It is the most widely used atomic frequency standard at present, and its development trend is high performance and miniaturization. According to the function of the constituent units, the rubidium atomic frequency standard can be simply divided into two parts: the mic...

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Problems solved by technology

However, the production cost of the precise fractional crystal oscillator is high, and it is di

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