Adaptive reference voltage method and system
US6906531B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 2002 |
| Grant date | Jun 14, 2005 |
| Priority date | — |
| Expiry date | Oct 11, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/063
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An adaptive reference voltage method and system analyzes a received bus signal to evaluate voltage swing characteristics and adjusts the reference voltage for reading the signal to a level that compensates for variations in margins between high and low signal switching values such as are introduced by noise. A bus input signal analyzer circuit incorporated in an integrated circuit analyzes the bus signal received at the integrated circuit to adjust the reference voltage used by the integrated circuit. In one embodiment, the bus input signal analyzer circuit applies a feedback loop to adapt the reference voltage by setting high and low input values to a reference voltage generation circuit with the reference voltage centered between the high and low values, such as results from a resistor divider network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.