Active resistive summer for a transformer hybrid
AssigneeMarvell International Ltd.
InventorPierte Roo
Life of this patent
Estimating the term…
Abstract
An electrical circuit in a communications channel is provided. The electrical circuit includes an active resistive summer. The active resistive summer has a composite signal as an input. The composite signal includes a transmission signal component and a receive signal component. A replica transmission signal is also an input to the active resistive summer. The active resistive summer includes the receive signal component as an output.
Claims55
An electrical circuit in a communications channel comprising:
- an active resistive summer including:
- an input for a composite signal, the composite signal including a transmission signal component and a receive signal component;
- an input for a replica transmission signal;
- and
- an output for a receive signal which comprises the composite signal minus the replica signal,
- wherein said active resistive summer includes an operational amplifier having a positive input terminal, a negative input terminal, and an output terminal, said active resistive summer further comprising:
- a feedback element in communication with the output terminal and the negative input terminal;
- a first resistor in communication with the negative input terminal and the composite signal;
- and
- a second resistor in communication with the negative input terminal and the replica transmission signal.
An electrical circuit in a communications channel comprising:
- means for summing including:
- means for inputting a composite signal;
- the composite signal including a transmission signal component and a receive signal component;
- means for inputting a replica transmission signal;
- and
- means for outputting a receive signal which comprises the composite signal minus the replica signal,
- wherein said summing means comprises means for amplifying including a positive input terminal, a negative input terminal, and an output terminal, said summing means further comprising:
- feedback means for communicating with the output terminal and the negative input terminal;
- first resistive means for communicating with the negative input terminal and the composite signal;
- and
- second resistive means for communicating with the negative input terminal and the replica transmission signal.
A method of reducing a transmission signal from a composite signal in a communications channel comprising the steps of:
- inputting the composite signal into an active resistive summer, the composite signal including the transmission signal component and a receive signal component;
- inputting a replica transmission signal into the active resistive summer;
- and
- outputting a signal from the active resistive summer which comprises the composite signal minus the replica transmission signal,
- wherein the active resistive summer includes an operational amplifier having a positive input terminal, a negative input terminal, and an output terminal, the active resistive summer further comprising:
- a feedback element in communication with the output terminal and the negative input terminal;
- a first resistor in communication with the negative input terminal and the composite signal;
- and
- a second resistor in communication with the negative input terminal and the replica transmission signal.
A method of reducing a transmission signal from a composite signal in a communication channel, the channel including a first transceiver and a second transceiver each to transmit and receive signals, said method comprising the steps of:
- providing the composite signal, the composite signal comprising the transmission signal of the first transceiver and a receive signal of the second transceiver;
- generating a replica of the transmission signal;
- subtracting the replica signal from the composite signal through an active resistive summer;
- and
- correcting baseline wander by inputting a baseline correction current into the active resistive summer.
A method of correcting baseline wander in a receive signal in a communications channel having a near end and far end, the channel including a first transceiver at the near end and a second transceiver at the far end each to transmit and receive signals, said method comprising the steps of:
- providing a composite signal, the composite signal comprising a transmission signal of the first transceiver and a receive signal of the second transceiver;
- generating a replica of the transmission signal;
- subtracting the replica signal from the composite signal through an active resistive summer;
- and
- providing a baseline correction current as an input to the active resistive summer.
An apparatus to correct baseline wander in a receive signal in a communications channel having a near end and far end, the channel including a first transceiver at the near end and a second transceiver at the far end each to transmit and receive signals, said apparatus comprising:
- a replica transmitter to generate a replica of the transmission signal;
- and
- an active resistive summer to subtract the replica signal from a composite signal, the composite signal comprising a transmission signal of the first transceiver and a receive signal of the second transceiver, said active resistive summer including:
- a first input to receive the composite signal;
- a second input to receive the replica of the transmission signal;
- and
- a third input to receive a baseline correction current.
An apparatus to correct baseline wander in a receive signal in a communications channel having a near and far end, the channel including a first transceiver at the near end and a second transceiver at the far end each to transmit and receive signals, said apparatus comprising:
- means for providing a composite signal, the composite signal comprising a transmission signal of the first transceiver and a receive signal of the second transceiver;
- means for generating a replica of the transmission signal;
- means for subtracting the replica signal from the composite signal;
- and
- means for providing a baseline correction current as an input to the subtracting means.
An electrical circuit in a communications channel, comprising:
- an active resistive summer,
- wherein the active resistive summer comprises an operational amplifier with an inverting feedback,
- wherein the operational amplifier includes a positive input terminal, a negative input terminal, and an output terminal,
- wherein the active resistive summer includes:
- an input for a composite signal, the composite signal including a transmission signal component and a receive signal component;
- an input for a replica transmission signal;
- an output for a receive signal which comprises the composite signal minus the replica signal;
- a feedback element in communication with the output terminal and the negative input terminal;
- a first resistor in communication with the negative input terminal and the composite signal;
- and
- a second resistor in communication with the negative input terminal and the replica transmission signal.
An electrical circuit in a communications channel, comprising:
- means for summing,
- wherein the summing means comprises means for amplifying with means for inverting feedback,
- wherein the means for amplifying including a positive input terminal, a negative input terminal, and an output terminal,
- wherein the summing means includes:
- means for inputting a composite signal, the composite signal including a transmission signal component and a receive signal component;
- means for inputting a replica transmission signal;
- means for outputting a receive signal which comprises the composite signal minus the replica signal;
- feedback means for communicating with the output terminal and the negative input terminal;
- first resistive means for communicating with the negative input terminal and the composite signal;
- and
- second resistive means for communicating with the negative input terminal and the replica transmission signal.
A method of reducing a transmission signal from a composite signal in a communications channel, comprising the steps of:
- inputting the composite signal into an active resistive summer, the composite signal including the transmission signal component and a receive signal component,
- wherein the active resistive summer includes an operational amplifier with inverting feedback,
- wherein the operational amplifier includes a positive input terminal, a negative input terminal, and an output terminal;
- inputting a replica transmission signal into the active resistive summer;
- and
- outputting a signal from the active resistive summer which comprises the composite signal minus the replica transmission signal,
- wherein the active resistive summer further includes:
- a feedback element in communication with the output terminal and the negative input terminal;
- a first resistor in communication with the negative input terminal and the composite signal;
- and
- a second resistor in communication with the negative input terminal and the replica transmission signal.
A method of reducing a transmission signal from a composite signal in a communication channel, the channel including a first transceiver and a second transceiver each to transmit and receive signals, the method comprising the steps of:
- providing the composite signal, the composite signal comprising the transmission signal of the first transceiver and a receive signal of the second transceiver,
- generating a replica of the transmission signal;
- subtracting the replica signal from the composite signal through an active resistive summer,
- wherein the active resistive summer includes an operational amplifier with inverting feedback;
- and
- correcting baseline wander by inputting a baseline correction current into the active resistive summer.
Dependencies are inferred from the claim text.