Development of high-stability miniaturized oven controlled crystal oscillator

This paper reports on the development of a high-stability miniaturized Oven Controlled Crystal Oscillator (OCXO) in the size of 9.7 mm × 7.5 mm based on the analog oscillation circuit combined with the conventional temperature sensing circuit using a thermistor and related discrete electrical components. The finite element method (FEM) is implemented to optimize the oven stability of the oven structure. As a result, a highly stable oven performance less than ±1°C variation within the ambient temperature ranging from -40 to 85°C is both numerically analyzed and experimentally demonstrated. Consequently, this result implies that the frequency stability of the miniaturized OCXO can achieve less than ±20 ppb using an AT-cut crystal.