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An ultra-compact and low-power oven- controlled crystal oscillator design for precision timing applications

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5 Author(s)
Jaehyun Lim ; Comput. Sci. & Eng., Pennsylvania State Univ., University Park, PA, USA ; Hyunsoo Kim ; Jackson, T.N. ; Kyusun Choi
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A novel design for a chip-scale miniature oven-controlled crystal oscillator (OCXO) is presented. In this design, all the main components of an OCXO-consisting of an oscillator, a temperature sensor, a heater, and temperature-control circuitry-are integrated on a single CMOS chip. The OCXO package size can be reduced significantly with this design, because the resonator does not require a separate package and most of the circuitry is integrated on a single CMOS chip. Other characteristics such as power consumption and warm-up time are also improved. Two different types of quartz resonators, an AT-cut tab mesa-type quartz crystal and a frame enclosed resonator, allow miniaturization of the OCXO structure. Neither of these quartz resonator types requires a separate package inside the oven structure; therefore, they can each be directly integrated with the custom-designed CMOS chip. The miniature OCXO achieves a frequency stability of ± 0.35 ppm with an AT-cut tab mesa-type quartz crystal in the temperature range of 0°C to 60°C. The maximum power consumption of this miniature OCXO is 1.2 W at start-up and 303 mW at steady state. The warm-up time to reach the steady state is 190 s. These results using the proposed design are better than or the same as high-frequency commercial OCXOs.

Published in:

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on  (Volume:57 ,  Issue: 9 )