Phase-locked loop runaway detector

Details Phase-locked loop runaway detector Phase-locked loop runaway detector

2007-05-02

2010-11-23

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S008000, C331S011000, C331S014000, C331S017000, C331S025000, C331S034000, C327S155000, C375S376000

Reexamination Certificate

active

07839220

ABSTRACT:
In a circuit having a runaway detector coupled to a phase-locked loop (PLL), the PLL may include a loop filter to receive a control voltage within the PLL and provide a filtered control voltage and a voltage-controlled oscillator to receive the filtered control voltage and provide an output clock signal. The runaway detector may provide a control signal for adjusting the filtered control voltage in response to a predetermined PLL condition. The runaway detector may include a comparator to receive a first and second input voltages, where the second input voltage is based on the output clock signal. When the predetermined PLL condition exists, the runaway detector may be active to adjust the filtered control voltage, thereby enabling the PLL to return to a lock condition.

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