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US 2003/0164731 A1Published application
Differential transimpedance amplifier for optical communication
AssigneeIntel Corporation
InventorTaesub Ty Yoon
Life of this patent
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Abstract
A differential transimpedance amplifier includes a differential transconductance stage to provide a current to a differential transimpedance stage. The differential transimpedance stage includes two gain stages and provides a voltage. A first feedback element is coupled in parallel with the differential transimpedance stage.
Claims36
A differential transimpedance amplifier, comprising:
- a differential transconductance stage to provide a current to a differential transimpedance stage, wherein the differential transimpedance stage provides a voltage;
- a first feedback element coupled in parallel with the differential transimpedance stage;
- and
- a DC restoration loop, including an operational amplifier coupled between the differential transimpedance stage and an offset current source, wherein the offset current source is coupled to an input of the differential transimpedance amplifier to reduce a DC offset.
1 more element
A differential transimpedance amplifier, comprising:
- a differential transconductance stage to provide a current to a differential transimpedance stage, wherein the differential transimpedance stage includes two gain stages and provides a voltage;
- and
- a first feedback element coupled in parallel with the differential transimpedance stage.
A receiver, comprising:
- a differential transimpedance amplifier, having
- a differential transconductance stage to provide a current to a differential transimpedance stage, wherein the differential transimpedance stage provides a voltage,
- a first feedback element coupled in parallel with the differential transimpedance stage, and
- a DC restoration loop, including an operational amplifier coupled between the differential transimpedance stage and an offset current source, wherein the offset current source is coupled to an input of the differential transimpedance amplifier to reduce a DC offset, and
- a detector coupled to an input of the differential transimpedance amplifier to detect a signal and to provide an input to the differential transimpedance amplifier.
2 more elements
A receiver, comprising:
- a differential transimpedance amplifier, having
- a differential transconductance stage to output a current to a differential transimpedance stage, wherein the differential transimpedance stage includes two gain stages and outputs a voltage and
- a first feedback element coupled in parallel with the differential transimpedance stage;
- and
- a detector coupled to an input of the differential transimpedance amplifier to detect a signal and to provide an input to the differential transimpedance amplifier.
2 more elements
A network interface, comprising:
- an optical receiver module having
- a transimpedance amplifier system to receive an input from a photo-detector, the transimpedance amplifier system including
- a differential transconductance stage to provide a current to a differential transimpedance stage, wherein the differential transimpedance stage provides a voltage,
- a first feedback element coupled in parallel with the differential transimpedance stage, and
- a DC restoration loop, including an operational amplifier coupled between the differential transimpedance stage and an offset current source, wherein the offset current source is coupled to an input of the differential transimpedance amplifier to reduce a DC offset, and
- a limiting amplifier to receive an output of the transimpedance amplifier;
- a recovery module to process an output of the limiting amplifier;
- and
- a media access control (“MAC”) module to analyze an output of the recovery module.
6 more elements
A network interface, comprising:
- an optical receiver module having
- a transimpedance amplifier system to receive an input from a photo-detector, the transimpedance amplifier system including
- a differential transconductance stage to provide a current to
- a differential transimpedance stage, wherein the differential transimpedance stage includes two gain stages and provides a voltage and
- a first feedback element coupled in parallel with the differential transimpedance stage, and
- a limiting amplifier to receive an output of the transimpedance amplifier;
- a recovery module to process an output of the limiting amplifier;
- and
- a media access control (“MAC”) module to analyze an output of the recovery module.
6 more elements
A method of reducing a DC offset caused by an input signal current, comprising:
- receiving a first average value of a first differential output;
- receiving a second average value of a second differential output;
- comparing the first average value of the first differential output and the second average value of the second differential output;
- providing a difference between the first average value of the first differential output and the second average value of the second differential output to an offset current source;
- and
- providing an output of the offset current source to a differential input.
3 more elements
A program code storage device, comprising:
- a machine-readable storage medium;
- and
- machine-readable program code, stored on the machine-readable storage medium, the machine-readable program code having instructions to
- receive a first average value of a first differential output;
- receive a second average value of a second differential output;
- compare the first average value of the first differential output and the second average value of the second differential output;
- provide a difference between the first average value of the first differential output and the second average value of the second differential output to an offset current source, and
- provide an output of the offset current source to a differential input.
5 more elements
Dependencies are inferred from the claim text.