Method and apparatus for detecting valid signal information

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...

Reexamination Certificate

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C324S1540PB, C324S613000, C327S072000, C340S315000

Reexamination Certificate

active

06710605

ABSTRACT:

BACKGROUND OF THE INVENTION
1) Technical Field
The present invention generally relates to microelectronic circuits. More particularly, the present invention relates to a circuit configured to differentiate a “valid” transmitted signal from noise signals transmitted over a transmission line.
2) Background of the Invention
When electronic signals are transmitted from one location to another along a line (e.g., a fiber optic cable or the like), electronic noise is often also transmitted with the signal along the line. In many cases, it is desirable to determine when a “valid” electronic signal from a transmission source, rather than just electronic noise, is transmitted over the line. For example, circuits such as clock and data recovery require a valid data input to operate properly. It is often necessary to first determine if the data signal is being properly transmitted. Accordingly, a circuit that is able to detect whether a “valid” signal is transmitted is desired.
SUMMARY OF THE INVENTION
A circuit for the detection of a valid signal on a line of the present invention includes an offset generator, a pair of data slicers, and an XOR gate. The circuit may also contain, for purposes of smoothing the response of the circuit, a low-pass filter and a Schmitt trigger.


REFERENCES:
patent: 4783658 (1988-11-01), Nakano et al.
patent: 5687321 (1997-11-01), Allen
patent: 6045927 (2000-04-01), Nakanishi et al.
patent: WO 98/28846 (1998-07-01), None

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