Phase frequency detector circuit
AssigneeNXP B.V.
InventorsLouis Praamsma, Nikola Ivanisevic
Life of this patent
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Abstract
A phase-frequency detector (PFD) circuit is disclosed. The PFD circuit includes a PFD portion adapted to detect frequency and phase difference of two input signals and to generate control signals according to the detected frequency and phase difference and a delay and reset portion adapted to delay the generated control signals, to generate reset signals for resetting the PFD portion based on a combination of the control signals and the delayed control signals, and to provide the generated reset signals to the PFD portion.
Claims12
A phase-frequency detector (PFD) circuit comprising:
- a PFD portion adapted to detect frequency and phase difference of two input signals and to generate control signals according to the detected frequency and phase difference;
- and
- a delay and reset portion adapted to delay the generated control signals, to generate reset signals for resetting the PFD portion based on a combination of the control signals and the delayed control signals, and to provide the generated reset signals to the PFD portion.
A method of phase-frequency detection for a phase locked loop, PLL, the method comprising:
- operating a PFD circuit portion to detect frequency and phase difference of two input signals and to generate control signals according to the detected frequency and phase difference;
- delaying the generated control signals;
- generating reset signals for resetting the PFD circuit portion based on a combination of the control signals and the delayed control signals;
- and
- providing the generated reset signals to the PFD circuit portion.
Dependencies are inferred from the claim text.