Oscillators – Electromechanical resonator – Crystal
Reexamination Certificate
2011-08-02
2011-08-02
Chang, Joseph (Department: 2817)
Oscillators
Electromechanical resonator
Crystal
C331S17700V
Reexamination Certificate
active
07990226
ABSTRACT:
A load circuit for a crystal oscillator includes a plurality of capacitors and a load control circuit configured to selectively add the capacitors to a load at a terminal of the crystal oscillator responsive to a command signal to provide a non-linear capacitive load at the terminal of the crystal oscillator that compensates for a non-linearity of a frequency versus load capacitance characteristic of the crystal oscillator. The load circuit may include a plurality of switches, respective ones of which are configured to load a terminal of the crystal oscillator with respective ones of the capacitors, and control circuit configured to control the plurality of switches to load the terminal of the crystal oscillator responsive to a binary command signal such that respective single ones of the switches operates in response to respective quantum changes a binary command signal over an operating range of the binary command signal.
REFERENCES:
patent: 5764111 (1998-06-01), Bushman
patent: 7352255 (2008-04-01), Green
patent: 7639092 (2009-12-01), Shen et al.
patent: 2002/0149435 (2002-10-01), Babcock
patent: 2006/0132110 (2006-06-01), Tang
patent: 2006/0267701 (2006-11-01), Eilers
patent: 2009/0261914 (2009-10-01), Kao et al.
Chang Joseph
Integrated Device Technology Inc.
Myers Bigel, et al.
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