Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Reexamination Certificate
2006-11-06
2008-12-09
Pascal, Robert (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Tuning compensation
C331S017000, C327S156000, C375S376000
Reexamination Certificate
active
07463098
ABSTRACT:
A feedback system such as a phase locked loop (PLL) includes a second feedback loop which responds when a VCO control voltage is near either end of its range, by slowly adjusting additional tuning elements which control the VCO frequency. The second feedback loop is arranged to cause a slow enough change in the VCO frequency that the first traditional feedback loop adjusts the control voltage quickly enough in a direction toward its mid-range value to keep the VCO frequency substantially unchanged. The second feedback loop advantageously incorporates one or more digital control signals which preferably change no more than one bit at a time and with a controlled slow ramp rate. As a result, the PLL maintains phase accuracy so that the operation of the PLL, including subtle specifications such as input data jitter tolerance or output jitter generation when used for clock and data recovery applications, is not negatively impacted. An impedance tuning feedback system provides a resistance between two nodes which is proportional to a reference resistance, and preferably incorporates slow digital switching to result in near perturbation-free state changes over the tuning range of the resistance.
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Baird Rex T.
Huang Yunteng
Perrott Michael H.
Johnson Ryan J
Pascal Robert
Silicon Laboratories Inc.
Zagorin O'Brien Graham LLP
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