Temperature compensated crystal oscillator (tcxo) with...

H - Electricity – 03 – B

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H03B 5/32 (2006.01) H03L 1/02 (2006.01)

Patent

CA 2022070

ABSTRACT OF THE DISCLOSURE A TCXO including a series capacitance is improved by having the temperature sensitivity of the series load capacitance be chosen in accordance with the formula Image wherein TLC is the temperature coefficient of the series load capacitor, TLC is the temperature coefficient of the resonator static capacitance, TK is the temperature coefficient of the piezoelectric coupling for the resonator, and .alpha.o is the center value of load factor .alpha. and wherein the load factor,.alpha., is defined as .alpha. = Image wherein Co is the resonator static capacitance and CL is the series load capacitance.

n oscillateur à quartz à compensation de température (TCXO) comprenant une capacité en série est amélioré par le choix de la sensibilité thermique de la capacité de charge en série suivant la formule TCL = TCo + 2 TK/(1-.alpha.o) dans laquelle TCL est le coefficient de température du condensateur de charge en série, TCo est le coefficient de température de la capacité statique du résonateur, TK est le coefficient de température du raccord piézoélectrique pour le résonateur et .alpha.o est la valeur centrale du facteur de charge .alpha., le facteur .alpha. étant défini comme (voir fig. 1) où Co est la capacité statique du résonateur et CL est la capacité de charge en série.

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