Oscillators – Automatic frequency stabilization using a phase or frequency... – Tuning compensation
Reexamination Certificate
2006-12-14
2009-02-24
Mis, David (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Tuning compensation
C331S017000, C331S018000, C331S025000, C331SDIG002
Reexamination Certificate
active
07495517
ABSTRACT:
Techniques are provided for dynamically adjusting the frequency range of phase-locked loops (PLLs). Phase detection circuitry in a PLL generates a control signal in response to a periodic input signal and a feedback signal. When the control signal deviates outside a valid range, the input frequency range of the PLL is dynamically adjusted to include the periodic input signal frequency. The input frequency range of the PLL is adjusted by changing one or more frequency ratios in the PLL. The resistance and/or capacitance of a loop filter in the PLL can be dynamically adjusted to control the bandwidth of the PLL.
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Hoang Tim Tri
Shumarayev Sergey
Altera Corporation
Cahill Steven J.
Mis David
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