Low voltage differential receiver/transmitter and calibration method thereof
US6448815B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2000 |
| Grant date | Sep 10, 2002 |
| Priority date | — |
| Expiry date | Oct 30, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0278
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A low-voltage transmitter and receiver adapted for differential signaling via transmission lines between integrated circuits enables operation at very-high data exchange rates. Such data transmission is achieved in a manner that minimizes reflected energy and minimizes crosstalk between signals propagating over neighboring transmission lines. In achieving optimal transmission characteristics, a bridge circuit is employed to drive the signal. The bridge circuit is connected in series between a pull-up and pull-down resistance, their respective resistance values being programmable to maintain optimal communication rates and quality. The pull-up and pull-down resistors preferably comprise a bank of transistors having source-to-drain resistance values that are binary multiples of each other. The transistors are preferably coupled in parallel with each other and in parallel with a resistor, such that the transistors can be selectively activated by a binary voltage control data word. By activating different transistors in the network, different overall resistance values can be achieved. A calibration circuit is provided for periodic calibration of the resistance values to maintain optima…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.