Active resistance summer for a transformer hybrid
First Claim
1. A transmit canceller in a communication channel, the channel including a first transceiver for transmitting and receiving signals and a replica transmitter for generating an input replica transmission signal, a composite signal at a near end comprising a transmission signal of the first transceiver and a signal received from a second transceiver, said transmit canceller comprising:
- an operational amplifier having a first polarity input terminal, a second polarity input terminal, and an output terminal;
a feedback element in communication with the second polarity input terminal and the output terminal;
a first input resistor in communication with the second polarity input terminal and the measured signal input;
a second input resistor in communication with the second polarity input terminal and the replica signal input; and
a predetermined voltage source in communication with the first polarity input terminal of the operational amplifier,wherein the received signal is an output at the output terminal of the operational amplifier.
2 Assignments
0 Petitions
Accused Products
Abstract
A transmit canceller comprises an operational amplifier having a first polarity input terminal, a second polarity input terminal, and an output terminal. A feedback element communicates with the second polarity input terminal and the output terminal. A first input resistor communicates with the second polarity input terminal and the measured signal input. A second input resistor communicates with the second polarity input terminal and the replica signal input. A predetermined voltage source communicates with the first polarity input terminal of the operational amplifier. The received signal is an output at the output terminal of the operational amplifier.
309 Citations
25 Claims
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1. A transmit canceller in a communication channel, the channel including a first transceiver for transmitting and receiving signals and a replica transmitter for generating an input replica transmission signal, a composite signal at a near end comprising a transmission signal of the first transceiver and a signal received from a second transceiver, said transmit canceller comprising:
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an operational amplifier having a first polarity input terminal, a second polarity input terminal, and an output terminal; a feedback element in communication with the second polarity input terminal and the output terminal; a first input resistor in communication with the second polarity input terminal and the measured signal input; a second input resistor in communication with the second polarity input terminal and the replica signal input; and a predetermined voltage source in communication with the first polarity input terminal of the operational amplifier, wherein the received signal is an output at the output terminal of the operational amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A transmit canceller in a communication channel, the channel including a first transceiver for transmitting and receiving signals and a replica transmitter for generating an input replica transmission signal, a composite signal at a near end comprising a transmission signal of the first transceiver and a signal received from a second transceiver, said transmit canceller comprising:
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means for amplifying including a first polarity input terminal, a second polarity input terminal, and an output terminal; feedback means for communicating with the second polarity input terminal and the output terminal; first means for communicating with the second polarity input terminal and the measured signal input; second means for communicating with the second polarity input terminal and the replica signal input; and means for supplying a predetermined voltage to the first polarity input terminal of the amplifying means, wherein the received signal is an output at the output terminal of the amplifying means. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of reducing a transmission signal from a composite signal in a communication channel, the channel including a first transceiver for transmitting and receiving signals and a replica transmitter for generating an input replica transmission signal, the composite signal at a near end comprising a transmission signal of the first transceiver and a signal received from a second transceiver, said method comprising the steps of:
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providing an operational amplifier having a first polarity input terminal, a second polarity input terminal, and an output terminal; arranging a feedback element to be in communication with the second polarity input terminal and the output terminal; arranging a first resistive element to be in communication with the second polarity input terminal and the measured signal input; arranging a second resistive element to be in communication with the e second polarity input terminal and the replica signal input; arranging a predetermined voltage source to be in communication with the first polarity input terminal of the operational amplifier; and outputting a signal at the output terminal that reduces the transmission signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. An electrical circuit for reducing a transmission signal comprising:
an active resistive summer having an operational amplifier that includes 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 a composite signal, the composite signal having a transit signal component and a receive signal component; and a second resistor in communication with the second polarity input terminal and a replica of the transmit signal.
Specification