High-stability quartz oscillators on internally-heated quartz resonators with AT and SC cuts

Precision frequency control requirements for future digital communication and position location systems require improved ovenized quartz oscillator performance. An effective way to fulfil the requirements for frequency stability, power consumption, size, warm-up time, mechanical effect resistance, etc. is to use internally heated quartz resonators (IHQRs). These devices combine, functionally and technologically, a quartz resonator and an oven in one construction. A number of industrial types of quartz oscillators on IHQR with AT and SC-cut piezoelements have been developed. They have frequency stability better then +or-(2.5-5.0)*10/sup -8/ in a temperature range from -60 to +or-75 degrees C, and a short-time stability for 1 s up to 1*10/sup -11/. The level of phase noise on Fourier frequencies 1 Hz and 10 Hz is -115 db/Hz and -134 dB/Hz, respectively, power consumption is less than 0.65 W (at -60 degrees C), warm-up time at -60 degrees is less than 2-10 min to +or-1*10/sup -7/ of the final value, and volume is 55-100 cm/sup 3/.<
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