Oscillators – Automatic frequency stabilization using a phase or frequency... – Plural a.f.s. for a single oscillator
Reexamination Certificate
2007-09-12
2010-06-29
Chang, Joseph (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Plural a.f.s. for a single oscillator
C331S016000, C331S044000, C331S046000, C331S179000
Reexamination Certificate
active
07746179
ABSTRACT:
A method and apparatus for selecting an optimum VCO from an array of VCOs is disclosed. Each VCO in the array has an output range and a limit. In one embodiment, a search set of VCOs is designated as all VCOs in a system. The limit is compared to a tuning value which corresponds to a desired calibration frequency. The comparison divides the array of VCOs into a searched set and a non-searched set. The process is repeated until the non-searched set comprises only one VCO. In another embodiment, the VCOs are ordered such that there is a middle VCO. A VCO in the middle of the array is selected. The limit of the middle VCO is compared to a tuning limit. Based on the comparison, another VCO is selected. The process repeats N times, where N is the logarithm, base 2, of the total number of VCOs to be searched. at the end of the search, an optimum VCO will be found.
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King, Jr. Nathaniel
Koupal Robert
Walker David
Chang Joseph
RF Micro Devices, Inc.
Shin Jeffrey
Withrow & Terranova , PLLC
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