Method and apparatus for detection of devices on a...

Details Method and apparatus for detection of devices on a... Method and apparatus for detection of devices on a...

2008-05-20

2008-05-20

Lau, Tung S. (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system

Reexamination Certificate

active

07376531

ABSTRACT:
Transmitters or other devices coupled to transmission links may be required to detect the presence of receivers (or other devices) on the links before starting signal transmission. Methods and apparatus are provided for a transmitter to detect the presence of a receiver on a link. The detection relies on measuring changes in the electrical characteristics of the link at the output of the transmitter. Changes in capacitive or other loading at the transmitter output, caused by the coupling of a link and receiver to the transmitter, may be estimated by determining the rise time of a signal at the transmitter output. The rise time may be estimated in response to applying a common-mode voltage step at the transmitter output, for example. The transmitter may be able to determine the presence of a receiver on the link from changes in rise-time. Increasing transmitter output impedance, or measuring common-mode driver rise time, may increase the accuracy of the detection process.

REFERENCES:
patent: 3530308 (1970-09-01), Pawletko
patent: 2005/0264306 (2005-12-01), Jung et al.

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