Lamb dip molecular clock

Abstract

The invention discloses a Lamb dip molecular clock, and belongs to the technical field of time and frequency. The molecular clock comprises a resonant gas cavity and a CMOS molecular saturation spectrum chip, the resonant gas cavity is filled with polar gas molecules, the pressure intensity of the polar gas molecules in the gas cavity is p, the temperature of the polar gas molecules in the gas cavity is T, and the upper surface and the lower surface of the gas cavity are adjustable reflecting surfaces; the CMOS molecular saturation spectrum chip comprises a pumping signal generation module, a Lamb sag detection module, a reflecting surface regulation and control feedback loop, a phase-locked demodulation amplification module, a pumping signal regulation and control feedback loop, a voltage-controlled crystal oscillator module and a fractional frequency division module. According to the invention, the lamb dip of the polar molecule rotation spectral line is used for improving the clock frequency locking stability for the first time, and the short-term, medium-long-term and long-term stability of the current chip-level molecular clock is improved; compared with a current miniaturized rubidium clock and an atomic clock, on the premise that the stability and the power consumption are predominant, the manufacturing cost is greatly reduced, the advantage of quick starting is achieved, and the starting time is smaller than or equal to 10 s.

Description

technical field [0001] The invention relates to the technical field of time and frequency, in particular to a Lamb sag molecular clock. Background technique [0002] The clock is the core basic device that provides time or frequency reference for the coordinated work of electronic systems. In the 5G high-speed wireless access network, massive input and output antennas (Massive MIMO) need to simultaneously transmit multiple radio frequency waveforms to increase channel capacity by utilizing multipath effects. Lower clock synchronization accuracy will reduce the efficiency of multipath synthesis and limit the transmission rate. The synchronization time accuracy formulated by the International Telecommunication Union (ITU) is 65 ns. In addition, the 5G base station achieves target positioning by measuring the arrival time of the signal, and the clock synchronization accuracy required for a 3m positioning error is 10ns. High-precision clock synchronization requires a miniaturi...

AI Technical Summary

Problems solved by technology

Among them, the impact broadening, pressure broadening and molecular saturation effects can be improved through system design, and the Doppler broadening caused by molecular thermal motion has become a bottleneck limiting the quality factor of spectral lines, limiting the stability of molecular clocks

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