Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular error voltage control
Reexamination Certificate
2007-02-20
2007-02-20
Pascal, Robert (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular error voltage control
C331SDIG002, C327S157000
Reexamination Certificate
active
11039113
ABSTRACT:
A hybrid frequency synthesizer includes an analog phase lock loop (PLL), a digital PLL, and a control circuit to control an output oscillator. The control circuit assigns control of the output oscillator between the analog PLL and/or the digital PLL depending on a state of lock of the analog PLL and/or the digital PLL. During a frequency acquisition mode, the digital PLL provides a coarse control of the output oscillator. During a phase capture mode, the analog PLL provides a fine control and the digital PLL provides a coarse control of the output oscillator. During the phase capture mode, the analog PLL control signal and the digital PLL control signal may be given a percentage of control over the output oscillator depending on the state of lock of the analog PLL and/or the digital PLL. During a phase lock mode, the analog PLL controls the output oscillator.
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U.S. Appl. No. 10/993,592, Colin Wai Mun Leong, Hybrid Analog/Digital Phase Lock Loop Frequency Synthesizer, filed Nov. 19, 2004.
Bal Jagdeep Singh
Leong Colin Wai Mun
Miller Richard
Carr & Ferrell LLP
Goodley James
Pascal Robert
Silicon Clocks Inc.
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