Method and apparatus for a crystal oscillator to achieve...

Details Method and apparatus for a crystal oscillator to achieve... Method and apparatus for a crystal oscillator to achieve...

2005-03-31

2008-03-25

Pascal, Robert (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S03600C, C331S183000

Reexamination Certificate

active

07348861

ABSTRACT:
One embodiment of the present invention includes a frequency generation circuit including a control module, an oscillator circuit coupled to the control module, the oscillator circuit having a start-up time defined by the time required to reach a desired frequency. The oscillator circuit includes an amplifier having an input and an output and being programmably-alterable by the control module, a first capacitor coupled to the input of the amplifier and being programmably-alterable, in capacitance, by the control module, a second capacitor coupled to the output of the amplifier, a crystal resonator coupled to the first and second capacitors for generating an output signal having a desired frequency, wherein fast start-up time is achieved.

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