IQ-skew adaptation for a symmetric eye in a SerDes receiver
US9172526B1 · kind B1 · utility
3Cited by
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20Claims
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Key dates
| Filing date | Jul 24, 2014 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | Jul 24, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03057
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Described embodiments provide for, in a receiver circuit, an adaptation process that adjusts the IQ-skew automatically to obtain proper eye centering in a data eye, thereby maximizing horizontal margin of the eye. The IQ-skew adaptation algorithm is realized with a ‘biased’ bang-bang phase detector (BBPD) oof a clock and data recovery circuit (CDR) that biases the weights applied to UP and DOWN outputs of the phase detector, rather than treating them equally. By weighting the BBPD UPs and DOWNs differently, the system locks to the left and right inner corners, and thereby is able to locate the center of the inner eye.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.