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US 2022/0286138 A1Published application
Phase Locked Loop with Low Reference Spur
AssigneeNVIDIA Corporation
InventorsChun-Ju Shen, Ying Wei, Vishnu Balan
Life of this patent
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Abstract
A calibration circuit including multiple charge pumps supplying a voltage controlled oscillator along different paths, one path being an integration path from a first one of the charge pumps to the voltage controlled oscillator, and one path being a proportional path from a second one of the charge pumps to the voltage controlled oscillator. A phase locked loop of the calibration circuit utilizes a switch capacitor circuit to reduce reference spur and improve the accuracy of clock edges for multi-phase calibration.
Claims20
A circuit comprising:
- a plurality of charge pumps;
- a voltage controlled oscillator;
- an integration path from a first one of the charge pumps to the voltage controlled oscillator;
- and
- a proportional path from a second one of the charge pumps to the voltage controlled oscillator.
2 more elements
A phase locked loop comprising:
- a first charge pump;
- a second charge pump;
- a voltage controlled oscillator;
- a first path dominated by capacitive effects from the first charge pump to the voltage controlled oscillator;
- a second path dominated by resistive effects from the second charge pump to the voltage controlled oscillator;
- and
- the charge pumps configured to output different valued currents on the first path and the second path during operation of the circuit.
4 more elements
A transceiver comprising:
- a data transmitting circuit;
- a data receiving circuit coupled to receive data signals from the transmitting circuit;
- one or more clock signal generators coupled to one or both of the transmitting circuit and the receiving circuit;
- one or more clock calibration circuits coupled to the one or more clock signal generators, at least one of the clock calibration circuits comprising:
- a plurality of charge pumps;
- and
- a voltage controlled oscillator configured to receive current from both of an integration path from a first one of the charge pumps and a proportional path from a second one of the charge pumps.
4 more elements
Dependencies are inferred from the claim text.