Temperature compensated oscillator

H - Electricity – 03 – L

Patent

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Details

H03L 1/02 (2006.01) H01L 27/08 (2006.01) H03K 3/011 (2006.01) H03K 3/0231 (2006.01)

Patent

CA 2317482

The invention concerns an oscillator (20) designed to supply a periodic voltage (Vo) at a predetermined frequency (f). Said oscillator comprises; a reference source (23) capable of supplying a reference voltage (Vref), said reference source including a resistor (R) connected to said voltage; and supply means (24) for receiving the reference voltage and supply the periodic voltage at the predetermined frequency, the supply means having a first thermal coefficient (.alpha.24) such that said frequency can vary by the effect of temperature. Said oscillator is characterised in that the resistor is formed to provide the reference source with a second thermal coefficient (.alpha.23) equal to ther first thermal coefficient, such that the temperature has the same influence on the voltage and on the supply means, thereby ensuring a temperature-independant periodic voltage supply.

La présente invention concerne un oscillateur (20) destiné à fournir une tension périodique (Vo) à une fréquence prédéterminée (f). Cet oscillateur comprend: une source de référence (23) pouvant fournir une tension de référence (Vref), cette source de référence comprenant une résistance (R) liée à cette tension; et un moyen de fourniture (24) pouvant recevoir la tension de référence et fournir la tension périodique à la fréquence prédéterminée, le moyen de fourniture ayant un premier coefficient thermique (.alpha.¿24?) de sorte que cette fréquence peut varier sous l'influence de la température. Cet oscillateur est caractérisé en ce que la résistance est formée pour conférer à la source de référence un deuxième coefficient thermique (.alpha.¿23?) égal au premier coefficient thermique, de sorte que la température a la même influence sur la tension de référence et sur le moyen de fourniture, ce qui permet la fourniture de la tension périodique indépendamment de la température.

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