Stmicroelectronics S.r.l.

Raffaele Iardino

Giulio Zoppi

A crystal oscillator circuit is configured to output an oscillation signal. A bias circuit responds to control signal to generate a bias current for application to the crystal oscillator circuit. A current generator generates a sense current from the control signal. The sense current is compared to a reference current by a comparator circuit. The comparator circuit generates a ready signal in response to the comparison. The ready signal is indicative of whether the oscillation signal output from the crystal oscillator circuit is ready for use by other circuitry. The reference current may be generated by a circuit which replicates the bias circuit.

Method of regulating a timeout delay introduced at start-up of a digital system to ensure readiness of a master amplitude-regulated crystal oscillator and implementing circuit

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Catania, Italy

Raffaele Iardino