Ultra-compact atomic clock system employing a GHz-band piezoelectric film resonator
Currently, the movement to miniaturize an atomic clock has progressed globally. We are making an effort to create atomic clocks on a single chip and already have developed an ultra-compact microwave oscillator and an alkali-metal gas cell for an atomic clock and achieved a sustainable atomic-clock operation. The oscillator and the gas cell are fabricated employing Micro-Electro-Mechanical Systems (MEMS) technology, which offers miniaturization and mass productivity using a wafer process. Unlike the conventional method of stabilizing the LC oscillator with a quartz one, our oscillator is composed only of a GHz-band MEMS oscillator. Complicated frequency multiplication is no longer necessary, and the configuration is extremely simplified. This result will contribute to the drastic reduction in size and power consumption of atomic clocks.
- 1 National Institute of Information and Communications Technology