PHASE LOCKED LOOP, PHASE LOCKED LOOP ARRANGEMENT, TRANSMITTER AND RECEIVER AND METHOD FOR PROVIDING AN OSCILLATOR SIGNAL
First Claim
1. A phase locked loop for a beamforming system, comprising:
- a digital loop filter configured to provide a digital control word to a digital controlled oscillator said digital controlled oscillator configured to provide an oscillator signal in response to the digital control word;
a frequency divider configured to provide a first feedback signal and a second feedback signal in response to the oscillator signal, the second feedback signal delayed with respect to the first feedback signal;
a first comparator path configured to receive the first feedback signal and a second comparator path configured to receive the second feedback signal, each of the first and second comparator path configured to provide a respective phase delay signal to the digital loop filter in response to a respective phase adjustment signal and a phase deviation between a common reference signal and the respective feedback signal.
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Accused Products
Abstract
A phase locked loop, for a particularly in a beamforming system comprises a digital loop filter to provide a digital control word to a controllable oscillator; a frequency divider configured to provide a first feedback signal and a second feedback signal in response to an oscillator signal, the second feedback signal delayed with respect to the first feedback signal; a first comparator path configured to receive the first feedback signal and a second comparator path configured to receive the second feedback signal, each of the first and second comparator path configured to provide a respective phase delay signal to the digital loop filter in response to a respective adjustment signal and a phase deviation between a common reference signal and the respective feedback signal.
3 Citations
19 Claims
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1. A phase locked loop for a beamforming system, comprising:
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a digital loop filter configured to provide a digital control word to a digital controlled oscillator said digital controlled oscillator configured to provide an oscillator signal in response to the digital control word; a frequency divider configured to provide a first feedback signal and a second feedback signal in response to the oscillator signal, the second feedback signal delayed with respect to the first feedback signal; a first comparator path configured to receive the first feedback signal and a second comparator path configured to receive the second feedback signal, each of the first and second comparator path configured to provide a respective phase delay signal to the digital loop filter in response to a respective phase adjustment signal and a phase deviation between a common reference signal and the respective feedback signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for providing an oscillator signal in a phase locked loop, comprising:
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generating a common reference signal; generating an oscillator signal in response to a digital control word; generating a first feedback signal based on the oscillator signal and a second feedback signal based on the oscillator signal and delayed with respect to the first feedback signal; generating a first phase delay signal based on a comparison between the reference signal and the first feedback signal and a second phase delay signal based on a comparison between the reference signal and the second feedback signal; adjusting a ratio between the first and second phase delay signals; generating the digital control word based on the adjusted phase delay ratio of first and second phase delay signals. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification