Real time averaged impedance calibration for on-die termination
US8384424B2 · kind B2 · utility
5Cited by
9References
23Claims
0Family size
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Key dates
| Filing date | Apr 8, 2011 |
| Grant date | Feb 26, 2013 |
| Priority date | — |
| Expiry date | Apr 8, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0278
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An averaged impedance calibration is obtained by utilizing two separately controlled resistive loads arranged in parallel and choosing two adjacent control codes to configure switch arrays to set the resistance of each of the separate resistive loads. The resistance of the resistive loads is averaged to provide greater accuracy. The two adjacent control codes are close to the target impedance value and typically one is slightly higher and one is slightly lower than the target impedance value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.