Nonvolatile programmable crystal oscillator circuit

Details Nonvolatile programmable crystal oscillator circuit Nonvolatile programmable crystal oscillator circuit

2007-05-22

2007-05-22

Chang, Joseph (Department: 2817)

Oscillators

Electromechanical resonator

Crystal

C331S1160FE

Reexamination Certificate

active

10949176

ABSTRACT:
According to embodiments of the invention, a nonvolatile memory such as a flash memory is used to configure a single die after packaging of the die has occurred. Thus, numerous applications may be supported by a single die or optimization within a given application may occur. According to embodiments of the invention, the nonvolatile memory may be accessed through a programming interface, and preferably, through a two-pin programming interface, to normalize parameters such as package parasitics, crystal variations, output dividers, output duty cycle, output edge rates, I/O configuration, and oscillator gain. According to an embodiment of the invention, an XO circuit configuration includes a nonvolatile memory and a stand-alone XO, where the XO circuit configuration does not require a PLL to synthesize a reference frequency produced by the XO.

REFERENCES:
patent: 5777383 (1998-07-01), Stager et al.
patent: 6563390 (2003-05-01), Kizziar
patent: 6927641 (2005-08-01), Terasawa et al.
patent: 2002/0149435 (2002-10-01), Babcock
patent: 2003/0122630 (2003-07-01), Fallisgaard et al.
patent: 2003/0174538 (2003-09-01), Uribe et al.

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