Rb atom frequency standard digital servo device

Abstract

The disclosed Rb-atom frequency scale digital servo comprises: a filter amplification circuit with input end connected with light-detection signal output end of the frequency scale system and output end connected with input end of a SCM, the SCM with output end for lock indication and SP10 port isolated by a optical-coupling circuit and connected to spi port of a 20-bit ADC, a voltage reference circuit with output connected ADC voltage reference input, and the output of ADC connected with the input of an isolation amplification circuit. This invention overcomes defects in prior art, and fit to precise control and fast lock.

Description

technical field [0001] The invention relates to a rubidium atomic frequency standard, specifically an electronic system of the rubidium atomic frequency standard, and more specifically relates to a rubidium atomic frequency standard digital servo device, which can be used for making miniaturized rubidium atomic frequency standard. Background technique [0002] The rubidium atomic frequency standard is a device that provides high-stable time-frequency signals. It has the characteristics of small size and light weight, and is currently the most widely used atomic frequency standard. Its principle is to use the transition line of the rubidium atom to lock the voltage-controlled crystal oscillator, that is, the physical system of the rubidium atomic frequency standard outputs an optical detection signal with frequency discrimination characteristics and obtains a DC error signal after synchronous phase discrimination to serve the voltage-controlled crystal oscillator. Therefore, ...

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Problems solved by technology

For the former, due to the need for a transformer, it is generally difficult to make a very symmetrical transformer, and the diode has the shortcomings of nonlinearity, saturation voltage drop and large reverse leakage current, so this method is less used in atomic frequency standards; for the latter Or, due to the use of active field effect tube devices, its parameters are easily affected by the environment (such as temperature), which will bring additional errors, and the circuit structure is also more complicated

In addition, since the signal of the low-pass part is close to direct current, its time constant is very large, so the capacitance of this servo device is also large, and electrolytic capacitors with relatively poor performance will be used, which may lead to long-term stability of the circuit. and reduced reliability

When optimizing the parameters of the rubidium atomic frequency standard produced by the analog servo device, it is necessary to adjust the hardware parameters of the servo device, which is complicated.

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