Control circuit and method for a crystal oscillator using a...

Details Control circuit and method for a crystal oscillator using a... Control circuit and method for a crystal oscillator using a...

2005-05-03

2005-05-03

Pascal, Robert (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S1160FE, C331S185000

Reexamination Certificate

active

06888418

ABSTRACT:
A circuit and method are disclosed for controlling current dissipated by an oscillator circuit. The circuit includes a current source adapted to source current to or sink current from the oscillator circuit. A control circuit is adapted to count a predetermined period of time following the occurrence of an event, such as completion of a power-up operation. An output of the control circuit, having a value indicative of whether the predetermined period of time has elapsed, is coupled to a control input of the current source. In this way, the output of the control circuit sets a current level sourced to or sunk from the oscillator circuit by the current source.

REFERENCES:
patent: 5923838 (1999-07-01), Hongo
patent: 6313712 (2001-11-01), Mourant et al.
patent: 6563391 (2003-05-01), Mar
patent: 6727769 (2004-04-01), Aihara et al.
patent: 6741137 (2004-05-01), Sibrai et al.
patent: 20030132741 (2003-07-01), Senthilkumar et al.

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