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US 10,566,958 B1Granted
Clock distribution schemes utilizing injection locked oscillation
AssigneeNVIDIA Corporation
InventorsSanquan Song, Olakanmi Oluwole, John Poulton, Carl Thomas Gray
Life of this patent
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Abstract
Injection locked oscillation circuits are applied along clock distribution circuit paths to increase clock signal bandwidth, reduce duty cycle error, reduce quadrature phase error, reduce clock signal jitter, and reduce clock signal power consumption.
Claims19
A clock distribution circuit comprising:
- a plurality of stages isolated from one another by a plurality of inverters;
- and
- a plurality of intertwining injection locked oscillation feedback circuit paths traversing at least one cross-coupled inverter pair between the inverters;
- wherein the clock distribution circuit is a hybrid quadrature clock distribution circuit and differential clock distribution circuit, and the feedback circuit paths comprise both of (a) at least one pair of symmetrical feedback circuit paths from at least one subsequent stage of the clock distribution circuit to an input of one or more preceding stages of the clock distribution circuit, and (b) feedback circuit paths traversing a cross-coupled ring circuit disposed between the inverters.
1 more element
A quadrature clock distribution circuit comprising:
- a plurality of intertwining injection locked oscillation feedback circuit paths traversing at least one cross-coupled inverter pair between a plurality of inverters;
- and
- the feedback circuit paths traverse a cross-coupled ring circuit disposed between the inverters and comprise at least one pair of symmetrical feedback circuit paths from at least one subsequent stage of the quadrature clock distribution circuit to inputs of one or more preceding stages of the quadrature clock distribution circuit.
A quadrature clock distribution circuit comprising:
- a plurality of intertwining injection locked oscillation feedback circuit paths traversing at least one cross-coupled inverter pair between a plurality of inverters, wherein the feedback circuit paths comprise at least one pair of symmetrical feedback circuit paths from at least one subsequent stage of the quadrature clock distribution circuit to inputs of one or more preceding stages of the quadrature clock distribution circuit;
- and
- the feedback circuit paths traverse a cross-coupled ring circuit disposed between the inverters and the feedback circuit paths comprise two pairs of symmetrical intertwining feedback circuit paths.
A quadrature clock distribution circuit comprising:
- a plurality of intertwining injection locked oscillation feedback circuit paths traversing at least one cross-coupled inverter pair between a plurality of inverters, wherein the feedback circuit paths comprise at least one pair of symmetrical feedback circuit paths from at least one subsequent stage of the quadrature clock distribution circuit to inputs of one or more preceding stages of the quadrature clock distribution circuit;
- and
- the feedback circuit paths traverse a cross-coupled ring circuit disposed between the inverters and the feedback circuit paths comprise three pairs of symmetrical intertwining feedback circuit paths.
A quadrature clock distribution circuit comprising:
- a differential clock distribution circuit;
- a plurality of intertwining injection locked oscillation feedback circuit paths traversing at least one cross-coupled inverter pair between a plurality of inverters, and the feedback circuit paths comprise both of (a) at least one pair of symmetrical feedback circuit paths from at least one subsequent stage to an input of one or more preceding stages, and (b)
- the feedback circuit paths traverse a cross-coupled ring circuit disposed between the inverters.
Dependencies are inferred from the claim text.