Apparatus and methods for invertible sine-shaping for phase interpolation
First Claim
1. An apparatus comprising:
- an invertible sine-shaping filter configured to;
receive an in-phase clock signal, a quadrature-phase clock signal, and an inversion control signal;
filter the in-phase and quadrature-phase clock signals to generate sinusoidal in-phase and quadrature-phase clock signals; and
selectively invert one or both of the in-phase and quadrature-phase clock signals based on an inversion control signal; and
a phase interpolator configured to generate an interpolated clock signal based on a weighted sum of the selectively inverted sinusoidal in-phase clock signal and the quadrature-phase sinusoidal clock signal,wherein the in-phase clock signal and the quadrature-phase clock signal have a quadrature-phase relationship.
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Abstract
Apparatus and methods for quadrature clock signal generation are provided. In certain implementations, an apparatus includes an invertible sine shaping filter configured to receive an in-phase clock signal, a quadrature-phase clock signal, and an inversion control signal. The invertible sine-shaping filter is further configured to filter the in-phase and quadrature-phase clock signals to generate sinusoidal in-phase and quadrature-phase clock signals. The invertible sine-shaping filter is further configured to selectively invert one or both of the in-phase and quadrature-phase clock signals based on an inversion control signal. The apparatus further includes a phase interpolator configured to generate an interpolated clock signal based on a weighted sum of the selectively inverted sinusoidal in-phase clock signal and the quadrature-phase sinusoidal clock signal. The in-phase clock signal and the quadrature-phase clock signal have a quadrature-phase relationship.
19 Citations
21 Claims
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1. An apparatus comprising:
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an invertible sine-shaping filter configured to; receive an in-phase clock signal, a quadrature-phase clock signal, and an inversion control signal; filter the in-phase and quadrature-phase clock signals to generate sinusoidal in-phase and quadrature-phase clock signals; and selectively invert one or both of the in-phase and quadrature-phase clock signals based on an inversion control signal; and a phase interpolator configured to generate an interpolated clock signal based on a weighted sum of the selectively inverted sinusoidal in-phase clock signal and the quadrature-phase sinusoidal clock signal, wherein the in-phase clock signal and the quadrature-phase clock signal have a quadrature-phase relationship. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of clock signal generation, the method comprising:
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filtering in-phase and quadrature-phase clock signals to generate sinusoidal in-phase and quadrature-phase clock signals; selectively inverting one or both of the in-phase and quadrature-phase clock signals based on an inversion control signal; and generating an interpolated clock signal based on a weighted sum of the selectively inverted sinusoidal in-phase clock signal and the quadrature-phase sinusoidal clock signal, wherein the in-phase clock signal and the quadrature-phase clock signal have a quadrature-phase relationship. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for clock signal generation, comprising:
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means for filtering in-phase and quadrature-phase clock signals to generate sinusoidal in-phase and quadrature-phase clock signals; means for selectively inverting one or both of the in-phase and quadrature-phase clock signals based on an inversion control signal; and means for generating an interpolated clock signal based on a weighted sum of the selectively inverted sinusoidal in-phase clock signal and the quadrature-phase sinusoidal clock signal, wherein the in-phase clock signal and the quadrature-phase clock signal have a quadrature-phase relationship.
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Specification