Pulse amplitude modulation (PAM) slicer including threshold calibration circuit
AssigneeQUALCOMM Incorproated
InventorsYounwoong Chung, Yu Song, Chia Heng Chang, Alan Daniel, Madjid Hafizi
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Abstract
A method of calibrating a first threshold voltage of a first pulse amplitude modulation (PAM) slicer and a second threshold voltage of a second PAM slicer. The method includes: calibrating the first threshold voltage of the first PAM slicer based on a non-return-to-zero (NRZ) signal and a PAM signal; and calibrating the second threshold voltage of the second PAM slicer based on the PAM signal and the calibrated first threshold voltage.
Claims20
An apparatus, comprising:
- a set of N pulse amplitude modulation (PAM) slicers, wherein N is an integer;
- a calibration PAM slicer;
- a threshold voltage source coupled to the set of N PAM slicers and the calibration PAM slicer;
- a calibration signal source coupled to the set of N PAM slicers and the calibration PAM slicer;
- and
- a calibration control circuit coupled to the set of N PAM slicers, the calibration PAM slicer, the threshold voltage source, and the calibration signal source,
- wherein the calibration signal source is controlled by the calibration control circuit.
A method of calibrating a first threshold voltage of a first pulse amplitude modulation (PAM) slicer and a second threshold voltage of a second PAM slicer, comprising:
- calibrating the first threshold voltage of the first PAM slicer based on a non-return-to-zero (NRZ) signal and a PAM signal;
- and
- calibrating the second threshold voltage of the second PAM slicer based on the PAM signal and the calibrated first threshold voltage.
Dependencies are inferred from the claim text.