Crystal oscillator with controlled duty cycle

Details Crystal oscillator with controlled duty cycle Crystal oscillator with controlled duty cycle

H - Electricity

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H03B 1/00 (2006.01) H03B 5/04 (2006.01) H03K 3/011 (2006.01) H03K 3/017 (2006.01) H03K 3/0231 (2006.01) H03K 3/0233 (2006.01) H03K 5/08 (2006.01) H03K 5/12 (2006.01) H03K 5/156 (2006.01)

Patent

CA 2321065

An oscillator circuit has a temperature and voltage compensating circuit (33), a variable current source (37), a duty cycle monitor and control circuit (35), a pull-down transistor (31) and an amplifier (39). Duty cycle monitor and control circuit (35) adjusts ramp-up current (Irmp) such that node (Va) reaches the threshold level of amplifier (39) at the same time during each cycle regardless of the duty cycle of pulse sequence (OSC).

L'invention porte sur un circuit oscillant comportant: un circuit de compensation de température et de tension (33); une alimentation variable (37), d'un circuit régulateur de cycle de travail et de commande (35); un transistor de mise à la masse (31); et un amplificateur (39). Le circuit régulateur de cycle de travail et de commande (35) ajuste le courant ascendant (Irpm) de manière à ce que le noeud (Va) atteigne le niveau seuil de l'amplificateur (39) au même moment, quel que soit le cycle de travail de la suite d'impulsions (OSC).

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