DC restoration circuit for multi-level transmission signals
AssigneeIntegrated Circuit Systems, Inc.
InventorAnthony E. Zortea
Life of this patent
Estimating the term…
Abstract
A DC restoration circuit to correct for baseline wandering in a data receiver is provided. A voltage correction circuit is connected to the received data line to adjust the voltage level of the received data dynamically. The voltage correction circuit is controlled by a feedback circuit which includes a voltage detection circuit configured to detect the peak voltage levels or envelope of the received data. This detected level is then compared to a reference level, and the result of the comparison is used as a control signal for the voltage correction circuit.
Claims10
A DC restoration circuit for a data receiver, comprising:
- a received data line configured to receive a multi-level transmission;
- a voltage correction circuit coupled to said received data line and configured to adjust a voltage level of said multi-level transmission;
- a feedback circuit having an input connected to said data line and an output coupled to a control input of said voltage correction circuit, said feedback circuit including
- a detection circuit configured to detect a baseline wander of received data, and
- a comparison circuit configured to generate a control signal to said control input of said voltage correction circuit in response to a comparison of an output of said detection circuit to a voltage reference;
- a first resistor coupled in series in said received data line;
- and
- a second resistor coupled to an output node of said first resistor,
- said voltage correction circuit including
- a diode coupled between an output of said comparison circuit and said second resistor, and
- a capacitor coupled between said output of said comparison circuit and ground.
A DC restoration circuit for a data receiver, comprising:
- a first resistance coupling a received data line to a correction node;
- a baseline wander detector having an input coupled to said correction node;
- a comparison circuit having a first input coupled to an output of said baseline wander detector, a second input coupled to a reference voltage, and an output;
- a capacitor coupled to said output of said comparison circuit;
- and
- a second resistor coupled between said output of said comparison circuit and said correction node.
A data transceiver comprising:
- a data receiver input;
- an equalizer coupled to said data receiver input;
- a first resistor having a first node coupled to an output of said equalizer;
- a slicer circuit coupled to a second node of said first resistor;
- a voltage correction circuit connected to said second node and configured to adjust a voltage level of the received data;
- a feedback circuit having an input coupled to said second node and an output coupled to a control input of said voltage correction circuit, said feedback circuit including
- a detection circuit configured to detect a low frequency voltage level of received data, and
- a comparison circuit configured to generate a control signal to said control input of said voltage correction circuit in response to a comparison of an output of said detection circuit to a voltage reference.
Dependencies are inferred from the claim text.