Crystal oscillator circuit having fast start-up and method...

Details Crystal oscillator circuit having fast start-up and method... Crystal oscillator circuit having fast start-up and method...

2007-10-11

2009-12-29

Kinkead, Arnold (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S034000, C331S03600C, C331S03600C, C331S074000, C331S109000, C331S185000, C331S186000

Reexamination Certificate

active

07639097

ABSTRACT:
In one embodiment, a method of programming an oscillator circuit includes providing a resonator, a first programmable capacitor, a second programmable capacitor, and an amplifier. The first programmable capacitor and the second programmable capacitor may be programmed at a first capacitance value during a first time period, wherein the first programmable capacitor provides a first voltage to bias the resonator and the amplifier alters the second voltage to provide a third voltage to the resonator. During a second time period the first capacitance value is increased.

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Vittoz et al; “High-Performance Crystal Oscillator Circuits: Theory and Application”; IEEE Journal of Solid-State Circuits, vol. 23, No. 3, Jun. 1988.

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