Eye monitor

• US 20030025491A1
• Filed: 07/11/2002
• Published: 02/06/2003
• Est. Priority Date: 08/01/2001
• Status: Active Grant

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Baumert, Wolfgang
• Granted Patent: US 6,784,653 B2
• Time in Patent Office: Days
• US Class Current: 324/121E
• CPC Class Codes: H04L 1/20 using signal quality detector

Abstract

An eye monitor for evaluating a binary input signal of a transmission link and for recognizing the edges of an eye diagram of the input signal is described. A decision circuit is provided which is directly connected to an integrator. The input signal and a variable threshold are provided to the decision circuit. An output signal of the integrator is used to recognize the edges of the eye diagram.

Claims

1. Eye monitor for evaluating a binary input signal of a transmission link and for recognizing the edges of an eye diagram of the input signal, comprising a decision circuit which is directly connected to an integrator, wherein the input signal and a variable threshold are provided to the decision circuit and wherein an output signal of the integrator is used to recognize the edges of the eye diagram.

2. Eye monitor of claim 1 wherein the output signal provides a first value if the variable threshold is about in the middle of the eye diagram.

3. Eye monitor of claim 1 wherein the output signal provides at least one second value if the variable threshold is in an upper and/or a lower part of the eye diagram.

4. Eye monitor of claim 3 wherein the second value is used to characterize the eye diagram of the input signal and in particular the edges of the eye diagram.

5. Eye monitor of claim 4 wherein an eye opening is evaluated based on the second value.

6. Receiver of a transmission system comprising an eye monitor for evaluating a binary input signal of a transmission link and for recognizing the edges of an eye diagram of the input signal, the eye monitor comprising a decision circuit which is directly connected to an integrator, wherein the input signal and a variable threshold are provided to the decision circuit and wherein an output signal of the integrator is used to recognize the edges of the eye diagram.

7. Method of evaluating a binary input signal of a transmission link and of recognizing the edges of an eye diagram of the input signal, wherein a decision circuit is directly connected to an integrator, and comprising the steps of providing the input signal and a variable threshold to the decision circuit and using an output signal of the integrator to recognize the edges of the eye diagram.