Differential transimpedance amplifier for optical communication

A differential transimpedance amplifier, comprising:

• a differential transimpedance stage having two gain stages, an inverting transimpedance input, a non-inverting transimpedance input, an inverting transimpedance output, and a non-inverting transimpedance output;
• a differential transconductance stage to provide a current to the differential transimpedance stage, wherein the differential transconductance stage has an inverting transconductance output and a non-inverting transconductance output;
• a first feedback element coupled to the non-inverting transimpedance output and the inverting transimpedance input, wherein the first feedback element is further coupled to the inverting transconductance output;
• and
• an additional first feedback element coupled to the inverting transimpedance output, and the non-inverting transimpedance input, wherein the additional first feedback element is further coupled to the non-inverting transconductance output.

A receiver, comprising:

• a differential transimpedance amplifier, having
• a differential transimpedance stage to provide a voltage, wherein the differential transimpedance stage has an inverting transimpedance input, a non-inverting transimpedance input, an inverting transimpedance output, and a non-inverting transimpedance output;
• a differential transconductance state to provide a current to the differential transimpedance state, wherein the differential transconductance stage has an inverting transconductance output and a non-inverting transconductance output,
• a first feedback element coupled to the non-inverting transimpedance output and the inverting transimpedance input, wherein the first feedback element is further coupled to the inverting transconductance output;
• and
• a DC restoration loop, including an operation 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.

A receiver, comprising:

• a differential transimpedance amplifier, including
• a differential transimpedance stage having two gain stages, an inverting transimpedance input, a non-inverting transimpedance input, an inverting transimpedance output, and a non-inverting transimpedance output;
• a differential transconductance stage to provide a current to the differential transimpedance stage, wherein the differential transconductance stage has an inverting transconductance output and a non-inverting transconductance output;
• a first-feedback element coupled to the non-inverting transimpedance output and the inverting transimpedance input, wherein the first feedback element is further coupled to the inverting transconductance output;
• and
• an additional first feedback element coupled to the inverting transimpedance output and the non-inverting transimpedance input, wherein the additional first feedback element is further coupled to the non-inverting transconductance output.

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.

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.

A differential transimpedance amplifier, comprising:

• a differential transimpedance stage to provide a voltage, wherein the differential transimpedance stage has an inverting transimpedance input, a non-inverting transimpedance input, an inverting transimpedance output, and a non-inverting transimpedance output;
• a differential transconductance stage to provide a current to the differential transimpedance stage, wherein the differential transconductance stage has an inverting transconductance output and a non-inverting transconductance output,
• a first feedback element coupled to the nverting transimpedance output and the non-inverting transimpedance input, wherein the first feedback element is further coupled to the non-inverting transconductance output;
• 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 the DC offset.

A receiver, comprising:

• a differential transimpedance amplifier, having
• a differential transimpedance stage to provide a voltage, wherein the differential transimpedance stage has an inverting transimpedance input, a non-inverting transimpedance input, an inverting transimpedance output, and a non-inverting transimpedance output;
• a differential transconductance stage to provide a current to the differential transimpedance stage, wherein the differential transconductance stage has an inverting transconductance output and a non-inverting transconductance output,
• a first feedback element coupled to the inverting transimpedance output and the non-inverting transimpedance input, wherein the first feedback element is further coupled to the non-inverting transconductance output;
• and
• a DC, restoration loop, including an operation 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.