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.
Claims42
A communication system including a first transmission channel with a first end and a second end, the first end coupled to a first transformer and the second end coupled to a second transformer, a first end transceiver transmitting and receiving signals via the first transformer and a second end transceiver transmitting and receiving signals via the second transformer, a first signal being supplied at the first end, the first signal comprising a transmission signal component of the first transceiver and a receive signal component from the second transceiver, said communication system comprising:
- a replica transmitter that generates a replica of the transmission signal component of the first transceiver;
- a filter to filter the replica signal;
- and
- an active resistive summer receiving the first signal and the filtered replica signal as inputs to reduce the transmission signal component at an output of the active resistive summer, wherein said active resistive summer includes an operational amplifier having a first polarity input terminal, a second polarity input terminal, and an output terminal, said active resistive summer further comprising:
- a feedback element in communication with the output terminal and the second polarity input terminal;
- a first resistor in communication with the second polarity input terminal and the first signal;
- and
- a second resistor in communication with the second polarity input terminal and the filtered replica signal.
A communication system including a first transmission channel with a first end and a second end, the first end coupled to a first transformer and the second end coupled to a second transformer, a first end transceiver transmitting and receiving signals via the first transformer and a second end transceiver transmitting and receiving signals via the second transformer, a first signal being supplied at the first end, the first signal comprising a transmission signal component of the first transceiver and a receive signal component of the second transceiver, said communication system comprising:
- means for replicating the transmission signal component of the first transceiver;
- means for filtering an output of the replicating means;
- and
- means for summing the first signal and an output of the filtering means to reduce the transmission signal at an output of the summing means, wherein said summing means includes means for amplifying having a first polarity input terminal, a second polarity input terminal, and an output terminal, said summing means further comprising:
- feedback means for communicating between the output terminal and the second polarity input terminal;
- first resistive means for communicating between the second polarity input terminal and the first signal;
- and
- second resistive means for communicating between the second polarity input terminal and the filtered replica transmission signal component.
A method in a communication system including a first transmission channel with a first end and a second end, the first end coupled to a first transformer and the second end coupled to a second transformer, a first end transceiver transmitting and receiving signals via the first transformer and a second end transceiver transmitting and receiving signals via the second transformer, a first signal being supplied at the first end, the first signal comprising a transmission signal component of the first transceiver and a receive signal component of the second transceiver, said method comprising the steps of:
- generating a replica of the transmission signal component of the first transceiver;
- filtering the replica signal;
- and
- summing with an active resistive summer the first signal and the replica signal to reduce the transmission signal at an output of the active resistive summer, wherein the active resistive summer includes an operational amplifier having a first polarity input terminal, a second polarity input terminal, and an output terminal, said active resistive summer further comprising:
- a feedback element in communication with the output terminal and the second polarity input terminal;
- a first resistor in communication with the second polarity input terminal and the first signal;
- and
- a second resistor in communication with the second polarity input terminal and the filtered replica transmission signal.
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, and
- wherein the active resistive summer further comprises:
- 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 the operational amplifier includes a first polarity input terminal, a second polarity input terminal, and an output terminal, and
- wherein the active resistive summer further comprises:
- a feedback element in communication with the output terminal and the second polarity input terminal;
- a first resistor in communication with the second polarity input terminal and the composite signal;
- and
- a second resistor in communication with the second polarity 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, and
- wherein the summing means further comprises:
- 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 the means for amplifying including a first polarity input terminal, a second polarity input terminal, and an output terminal, and
- wherein the summing means further comprises:
- feedback means for communicating with the output terminal and the second polarity input terminal;
- first resistive means for communicating with the second polarity input terminal and the composite signal;
- and
- second resistive means for communicating with the second polarity 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;
- 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 operational amplifier includes a first polarity input terminal, a second polarity input terminal, and an output terminal, and
- wherein the active resistive summer further includes:
- a feedback element in communication with the output terminal and the second polarity input terminal;
- a first resistor in communication with the second polarity input terminal and the composite signal;
- and
- a second resistor in communication with the second polarity input terminal and the replica transmission signal.
Dependencies are inferred from the claim text.