US 8,867,603 B1 · Method and system for balancing an equalizer at a receiver

Abstract

A configurable analog equalizer is set to a first high-pass frequency response that is intentionally too moderate to compensate for a low-pass frequency response of a physical link coupling a transmitter and a receiver. A Feed Forward Equalizer (FFE) is activated at the receiver; the FFE includes a set of coefficients having a minimum configuration of a cursor coefficient and a first pre-cursor coefficient. A Decision Feedback Equalizer (DFE) is activated at the receiver; the DFE includes a set of coefficients having a minimum configuration of a first post-cursor coefficient. The configurable analog equalizer is then set to a high-pass frequency response that is more intense than the first high-pass frequency response, until the first post-cursor coefficient of the DFE substantially equals an absolute value of a quotient obtained by dividing the first pre-cursor coefficient of the FFE by the cursor coefficient of the FFE.

Claims19

Dependent claims

A method comprising:

setting, at a receiver, a configurable analog equalizer to a first high-pass frequency response that is too moderate to compensate for a low-pass frequency response of a physical link coupling a transmitter and the receiver;
activating, at the receiver, a Feed Forward Equalizer (FFE) comprising a set of coefficients having a minimum configuration of a cursor coefficient and a first pre-cursor coefficient;
activating, at the receiver, a Decision Feedback Equalizer (DFE) comprising a set of coefficients having a minimum configuration of a first post-cursor coefficient;
and
setting the configurable analog equalizer to a high-pass frequency response that is more intense than the first high-pass frequency response until the first post-cursor coefficient of the DFE substantially equals an absolute value of a quotient obtained by dividing the first pre-cursor coefficient of the FFE by the cursor coefficient of the FFE.

2 more elements

A system for equalizing communication signals, comprising:

a configurable analog equalizer;
a Feed Forward Equalizer (FFE) comprising set of coefficients having a minimum configuration of a cursor coefficient and a first pre-cursor coefficient;
and
a Decision Feedback Equalizer (DFE) comprising set of coefficients having a minimum configuration of a first post-cursor coefficient;
wherein the system is configured to:
set the configurable analog equalizer to a first high-pass frequency response that is too moderate to compensate for a low-pass frequency response of a physical link coupling a transmitter and the system;
activate the FFE;
activate the DFE;
and
set the configurable analog equalizer to a high-pass frequency response that is more intense than the first high-pass frequency response, until the first post-cursor coefficient of the DFE substantially equals an absolute value of a quotient obtained by dividing the first pre-cursor coefficient of the FFE by the cursor coefficient of the FFE.

7 more elements

Dependencies are inferred from the claim text.

Method and system for balancing an equalizer at a receiver

Life of this patent

Method and system for balancing an equalizer at a receiver

Life of this patent

Abstract

Claims19