小型化10 MHz恒温晶体振荡器设计

设计了用于高精度铷原子频标的一种小型化恒温压控晶体振荡器.振荡电路采用了稳定性好的并联型皮尔斯电路方案,采用2级?型LC级联滤波器抑制谐杂波,利用互补对称式金属-氧化物-半导体(CMOS)反相器实施隔离.振荡和放大电路选用了低噪声晶体管.晶体的温度控制在频率-温度曲线拐点处.实现了体积为4 mL晶振样件.晶振的短期频率稳定度为1.8?10-12/s,相噪对铷频标频率稳定度的贡献仅为3.2?10-13-1/2.

Design of A Miniature 10 MHz Oven Crystal Oscillator

A small-size oven temperature controlled crystal oscillator for rubidium atomic frequency standards was designed. In the design, a Pierce oscillator circuit, a two step π type LC filter and a Complementary-Symmetery Metal-Oxicle-Semiconcluctor(COMS) inversion isolator were used. Low thermal noise transistors were employed in the circuit. The temperature of the crystal oscillator was set at the turning point of the frequency-temperature curve. The crystal oscillator was of a volume of 4 mL with a short-term frequency stability of 1.8×10^-12/s. The oscillator was of low phase noise, and its fractional frequency stability contribution to a rubidium atomic frequency standard was estimated to be in a level of 3.2×10^-13τ ^-1/2.