Phase interpolation circuit and receiver circuit
AssigneeFujitsu Semiconductor Limited
InventorToshie KATOH
Life of this patent
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Abstract
A phase interpolation circuit includes: a first circuit configured to generate a first intermediate signal by weighting first reference signals having different phases with a first ratio and combining weighed first reference signals; a second circuit configured to generate a second intermediate signal by weighing second reference signals having phases different from the phases of the first reference signals by a certain value with a second ratio equal to the first ratio and combining weighted second reference signals; and a third circuit configured to generate an output signal by combining the first intermediate signal and the second intermediate signal.
Claims17
A phase interpolation circuit comprising:
- a first circuit configured to generate a first intermediate signal by weighting first reference signals having different phases with a first ratio and combining weighed first reference signals;
- a second circuit configured to generate a second intermediate signal by weighing second reference signals having phases different from the phases of the first reference signals by a certain value with a second ratio equal to the first ratio and combining weighted second reference signals;
- and
- a third circuit configured to generate an output signal by combining the first intermediate signal and the second intermediate signal.
A receiver circuit comprising:
- a receiver configured to acquire data from a received signal in accordance with a clock signal;
- a detection circuit configured to detect a phase difference between the received signal and the clock signal on the basis of the data;
- and
- a phase interpolation circuit configured to adjust a phase of the clock signal on the basis of the phase difference,
- the phase interpolation circuit including:
- a first circuit configured to generate a first intermediate signal by weighting first reference signals having different phases with a first ratio and combining weighed first reference signals;
- a second circuit configured to generate a second intermediate signal by weighing second reference signals having phases different from the phases of the first reference signals by a certain value with a second ratio equal to the first ratio and combining weighted second reference signals;
- and
- a third circuit configured to generate the clock signal by combining the first intermediate signal and the second intermediate signal.
Dependencies are inferred from the claim text.