Atomic oscillator and manufacturing method of the atomic oscillator

摘要

An atomic oscillator includes an atomic cell in which an atom is enclosed, a magnetic field generation part to apply a magnetic field to the atomic cell, a reference oscillator which is controlled based on an atomic resonance signal outputted from the atomic cell and generates a reference signal, and a fractional N-PLL which receives the reference signal to generate a signal including a resonance frequency of the atom, in which when a maximum digit of the resonance frequency adjustable by the magnetic field generation part is a boundary digit, the fractional N-PLL can adjust at least a digit one digit higher than the boundary digit.

主权项

1. An atomic oscillator comprising:
an atomic cell in which an atom is enclosed; a magnetic field generation part to apply a magnetic field to the atomic cell; a reference oscillator that is controlled based on an atomic resonance signal outputted from the atomic cell and generates a reference signal; and a fractional N-PLL that receives the reference signal to generate a signal including a resonance frequency of the atom, wherein when a maximum digit of the resonance frequency adjustable by the magnetic field generation part is a boundary digit, the fractional N-PLL is operable to adjust the resonance frequency at least a digit that is one digit higher than the boundary digit, the fractional N-PLL includes an n-bit decimal setting part to determine a decimal part of a frequency division ratio, and when a bit number of the decimal setting part is n, a phase comparison frequency is fPFD , the resonance frequency is fΔE , and an adjustable ratio of the magnetic field generation part to the resonance frequeny is RM ,following equation is satisfiedfPFD2n≤fΔ⁢⁢E×RM.