PLL circuit and phase control method of PLL circuit
AssigneeNEC Corporation
InventorMasayuki Takahashi
Life of this patent
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Abstract
A PLL circuit having a phase build-out function and a phase control method of the PLL circuit, in which a phase build-out detector monitors the input phase of a PLL device and detects a transient wander component and a cycle wander component at the same time. When only the transient wander component is automatically detected, a phase build-out actuator resets a phase detector, a digital amp-1 and a digital filter to restructure an output phase as before an input phase change. As to the cycle wander component detected at the same time, no phase restructuring is carried out.
Claims10
A phase control method of a phase-locked loop circuit having a phase build-out function, comprising:
- a storing step for storing phase data obtained by sampling within monitoring interval time of an input phase into a memory;
- a calculating step for calculating a maximum phase amplitude value within the interval time from the phase data sampled;
- and
- a first comparing step for comparing the maximum phase amplitude value with a transient wander threshold value set for detecting a transient wander.
A phase-locked loop circuit having a phase build-out function, comprising:
- storing means for storing phase data obtained by sampling within monitoring interval time of an input phase into a memory;
- calculating means for calculating a maximum phase amplitude value within the interval time from the phase data sampled;
- and
- transient wander detecting means for comparing the maximum phase amplitude value with a transient wander threshold value set to detect a transient wander.
Dependencies are inferred from the claim text.