Data receiver with a programmable reference voltage to optimize timing jitter
US7230449B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2005 |
| Grant date | Jun 12, 2007 |
| Priority date | — |
| Expiry date | Aug 12, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0272
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Pseudo-differential drivers and receivers are used to communicate data signals between two or more IC chips. The data paths are aligned using programmable delay circuitry to de-skew each data path. A programmable reference generator is used to generate a reference voltage used by one or a group of receivers to detect the data signals. The reference voltage is adjustable using coarse as well as fine digitally controlled voltage increments. Test signals are sent from the driver to the receiver and the reference voltage is varied over its adjustable range using the coarse and fine adjustment controls while circuitry determines a measure of the detection timing jitter on successive transitions of the test signal. The operational value of the reference voltage is set to the value where the detection timing jitter is determined to be a minimum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.