摘要:
A circuit configured to generate an analog signal having a pre-determined pattern. The circuit includes a plurality of digital-to-analog converters. Each of the plurality of digital-to-analog converters includes a plurality of current sources configured to generate a plurality of square waveforms and a summer configured to sum the plurality of square waveforms to generate the analog signal having the pre-determined pattern. Each square waveform is delayed by a pre-determined amount delay relative to another square waveform of the plurality of square waveforms. The pre-determined amount of delay between each square waveform of the plurality of waveforms is adjustable to adjust the pre-determined pattern of the analog signal. The pre-determined amount of delay is non-uniform throughout the circuit.
摘要:
A switching physical layer (PHY) device comprises a first termination network, a switching transmitter, and a switching receiver. The first termination network communicates with a first network connector. The switching transmitter includes first and second outputs, which communicate with the first termination network and a second termination network, respectively. The switching transmitter selectively outputs a transmit signal to a selected one of the first and second termination networks based on a control signal. The switching receiver includes first and second inputs, which communicate with the first and second termination networks, respectively. The switching receiver receives a receive signal from the selected one of the first and second termination networks.
摘要:
A communication circuit, Ethernet controller card, and method comprises K digital-to-analog converters each receiving a corresponding digital control signal and each providing a corresponding analog control signal, wherein K is at least two; K voltage-to-current converters each providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals; and wherein the corresponding bi-level transmit signal components of each of the K voltage-to-current converters are combined to produce a J-level transmit signal, wherein J=K+1.
摘要:
An electrical circuit in a communications channel includes a first sub-circuit having a first input which receives a composite signal that includes a transmission signal component and a receive signal component, a second input which receives a replica transmission signal, a third input which receives an analog baseline correction current, and an output which provides a receive signal which comprises the composite signal minus the replica signal. A second sub-circuit for controls the analog baseline correction current, so that the magnitude of the composite signal does not exceed a predetermined value of an operating parameter of the electrical circuit. The composite signal, the replica transmission signal, and the analog baseline correction current are directly connected together at a common node of the first sub-circuit.
摘要:
A system includes a transceiver configured to receive a composite signal. The composite signal is a composite of a transmit signal and a receive signal. A replica transmitter is configured to generate a replica transmit signal based on the transmit signal. A transmit canceller is configured to recover the receive signal at least in part by resistively summing the composite signal and the replica transmit signal.
摘要:
A circuit includes T sets of digital to analog converters (DACs), each including N current sources and M delay elements. An output signal includes a sum of outputs of the N current sources. An input of a first one of the M delay elements and a control input of a first one of the N current sources receive a respective one of a plurality of decoded signals. T sets of first converters each have a feedback node, an output, and an input that communicates with the output signal of a respective one of the T sets of DACs. T second converters have inputs that communicate with respective ones of the feedback nodes of each of the T sets of first converters. A summer generates a difference signal that is based on the outputs of the T sets of first converters and outputs of the T second converters.
摘要:
An Ethernet controller includes a plurality of sets of digital-to-analog converters (DACs). Each DAC receives an input signal and provides an output signal. Each of the plurality of sets of DACs includes a plurality of sets of replica current circuits. Each DAC includes current sources. Each current source includes a respective control input. The output signal provided by each DAC includes a sum of outputs of the current sources. Each DAC also includes delay elements. An input of a first one of the delay elements receives the input signal. An mth one of the delay elements includes an input in communication with an m-1th one of the delay elements. An output of one of the delay elements controls a corresponding control input of one of the current sources. A sum of each output signal from a respective one of the plurality of sets of DACs forms an accumulated output signal.
摘要:
An Ethernet controller includes a decoder, and T sets of transmit circuits. Each set of transmit circuits receives one of T decoded signals from the decoder, and includes a digital-to-analog converter (DAC) that provides a transmit output signal, and a replica circuit that provides a replica output signal. Each DAC includes N current sources arranged in parallel and differentially, and M delay elements. Each current source includes a control input. A sum of outputs of the N current sources forms each transmit output signal. An input of the first delay element and the control input of the first current source receive a decoded signal. An input of an mth delay element is in communication with an output of an m−1th delay element. The output of each delay element controls a corresponding control input of a current source. A sum of the transmit output signals forms an accumulated output signal.
摘要:
A communication circuit, Ethernet controller card, and method comprises K digital-to-analog converters each receiving a corresponding digital control signal and each providing a corresponding analog control signal, wherein K is at least two; K voltage-to-current converters each providing a corresponding bi-level transmit signal component in accordance with a respective one of the corresponding analog control signals; and wherein the corresponding bi-level transmit signal components of each of the K voltage-to-current converters are combined to produce a J-level transmit signal, wherein J=K+1.
摘要:
A system includes a transceiver configured to receive a composite signal. The composite signal is a composite of a transmit signal and a receive signal. A replica transmitter is configured to generate a replica transmit signal based on the transmit signal. A transmit canceller is configured to recover the receive signal at least in part by resistively summing the composite signal and the replica transmit signal.