Quadrature and duty cycle error correction in matrix phase lock loop
First Claim
1. A method comprising:
- generating, at a plurality of delay stages of a local oscillator, a plurality of phases of a local oscillator signal;
providing the plurality of phases of the local oscillator signal to a loop error matrix phase comparator and responsively generating a loop error signal based on a comparison of one or more phases of the local oscillator signal to one or more phases of a received reference clock;
providing the plurality of phases of the local oscillator signal to an interphase matrix phase comparator and responsively generating a plurality of phase-specific quadrature error signals, each phase-specific quadrature error signal associated with a respective phase of the plurality of phases of the local oscillator signal, each phase-specific quadrature error signal based on a comparison of the respective phase to two or more other phases of the local oscillator signal; and
adjusting each delay stage according to a corresponding phase-specific quadrature error signal of the plurality of phase-specific quadrature error signals and the loop error signal.
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Accused Products
Abstract
Generating, at a plurality of delay stages of a local oscillator, a plurality of phases of a local oscillator signal, generating a loop error signal based on a comparison of one or more phases of the local oscillator signal to one or more phases of a received reference clock, generating a plurality of phase-specific quadrature error signals, each phase-specific quadrature error signal associated with a respective phase of the plurality of phases of the local oscillator signal, each phase-specific quadrature error signal based on a comparison of the respective phase to two or more other phases of the local oscillator signal, and adjusting each delay stage according to a corresponding phase-specific quadrature error signal of the plurality of phase-specific quadrature error signals and the loop error signal.
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Citations
20 Claims
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1. A method comprising:
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generating, at a plurality of delay stages of a local oscillator, a plurality of phases of a local oscillator signal; providing the plurality of phases of the local oscillator signal to a loop error matrix phase comparator and responsively generating a loop error signal based on a comparison of one or more phases of the local oscillator signal to one or more phases of a received reference clock; providing the plurality of phases of the local oscillator signal to an interphase matrix phase comparator and responsively generating a plurality of phase-specific quadrature error signals, each phase-specific quadrature error signal associated with a respective phase of the plurality of phases of the local oscillator signal, each phase-specific quadrature error signal based on a comparison of the respective phase to two or more other phases of the local oscillator signal; and adjusting each delay stage according to a corresponding phase-specific quadrature error signal of the plurality of phase-specific quadrature error signals and the loop error signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus comprising:
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a local oscillator comprising a plurality of delay stages configured to generate a plurality of phases of a local oscillator signal, each delay stage adjusted according to (i) a corresponding phase-specific quadrature error signal of a plurality of phase-specific quadrature error signals and (ii) a loop error signal; a loop error matrix phase comparator configured to receive the plurality of phases of the local oscillator signal and to responsively generate the loop error signal based on a comparison of one or more phases of the local oscillator signal to one or more phases of a received reference clock; and an interphase matrix comparator configured to receive the plurality of phases of the local oscillator signal and to responsively generate the plurality of phase-specific quadrature error signals, each phase-specific quadrature error signal associated with a respective phase of the plurality of phases of the local oscillator signal, each phase-specific quadrature error signal based on a comparison of the respective phase to two or more other phases of the local oscillator signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification