A communication node is connected to a transmission line which transmits a differential signal changeable between a high level and a low level and has a high potential signal line and a low potential signal line as a pair of signal lines. The communication node includes: an inter-line potential detector that detects an intermediate potential between the pair of signal lines; a node potential detector that detects an intermediate potential of an operation power source voltage which is supplied to the communication node; and a voltage adjuster that detects a difference between the intermediate potential detected by the inter-line potential detector and the intermediate potential detected by the node potential detector, and adjusts the operation power source voltage in accordance with the difference.

The present disclosure discloses an adjustable electric control equalization circuit used for cable television networks. The disclosed adjustable electric control equalization circuit includes one or more electric control equalization modules with adjustable slopes, a control module, and one or more compensation modules. The control module and the one or more electric control equalization modules are electrically connected to control slope change of the one or more electric control equalization modules. The control module and the one or more compensation modules are electrically connected to generate compensation signals based on the slope change of the one or more electric control equalization modules. An output of the one or more electric control equalization modules is electrically connected to an input of the one or more compensation modules to output a combined signal of a sum of signals outputted from the electric control equalization module and the compensation module.

The present disclosure discloses an adjustable electric control equalization circuit used for cable television networks. The disclosed adjustable electric control equalization circuit includes one or more electric control equalization modules with adjustable slopes, a control module, and one or more compensation modules. The control module and the one or more electric control equalization modules are electrically connected to control slope change of the one or more electric control equalization modules. The control module and the one or more compensation modules are electrically connected to generate compensation signals based on the slope change of the one or more electric control equalization modules. An output of the one or more electric control equalization modules is electrically connected to an input of the one or more compensation modules to output a combined signal of a sum of signals outputted from the electric control equalization module and the compensation module.

An attenuator having an impedance that is controllable by a first setpoint signal is coupled to a transmission line. A matching circuit having an impedance that is controllable by a second setpoint signal is also coupled to the transmission line. A transformer circuit block also coupled to the transmission line has a complex impedance. A control circuit sets the first and second setpoint signals so as to control a conjugate impedance relationship between the variable impedances presented by the attenuator and matching circuit relative to the complex impedance of the transformer circuit.

An attenuator having an impedance that is controllable by a first setpoint signal is coupled to a transmission line. A matching circuit having an impedance that is controllable by a second setpoint signal is also coupled to the transmission line. A transformer circuit block also coupled to the transmission line has a complex impedance. A control circuit sets the first and second setpoint signals so as to control a conjugate impedance relationship between the variable impedances presented by the attenuator and matching circuit relative to the complex impedance of the transformer circuit.

A communication node is connected to a transmission line which transmits a differential signal changeable between a high level and a low level and has a high potential signal line and a low potential signal line as a pair of signal lines. The communication node includes: an inter-line potential detector that detects an intermediate potential between the pair of signal lines; a node potential detector that detects an intermediate potential of an operation power source voltage which is supplied to the communication node; and a voltage adjuster that detects a difference between the intermediate potential detected by the inter-line potential detector and the intermediate potential detected by the node potential detector, and adjusts the operation power source voltage in accordance with the difference.

A communication node is connected to a transmission line which transmits a differential signal changeable between a high level and a low level and has a high potential signal line and a low potential signal line as a pair of signal lines. The communication node includes: an inter-line potential detector that detects an intermediate potential between the pair of signal lines; a node potential detector that detects an intermediate potential of an operation power source voltage which is supplied to the communication node; and a voltage adjuster that detects a difference between the intermediate potential detected by the inter-line potential detector and the intermediate potential detected by the node potential detector, and adjusts the operation power source voltage in accordance with the difference.

A method for generating a physical layer (PHY) data unit includes generating a first signal field to include multiple copies of first signal field content, wherein the first signal field content spans one sub-band of a plurality of sub-bands of the PHY data unit, and wherein the multiple copies collectively span the plurality of sub-bands of the PHY data unit; generating a second signal field to include multiple copies of second signal field content, wherein the second signal field content spans multiple ones of the plurality of sub-bands of the PHY data unit, and wherein the multiple copies of the second signal field collectively span the plurality of sub-bands of the PHY data unit; generating a preamble of the PHY data unit to include at least the first signal field and the second signal field; generating the PHY data unit to include at least the preamble.

Embodiments of the invention provide a capability of determining an input impedance of a connected Device Under Test based on Waveform Monitoring of an output signal of a waveform generator. Using embodiments of the invention, the input impedance of DUT is determined from the waveform monitoring results. The impedance information of the DUT together with the actual waveform provided to the DUT allows systems according to embodiments of the invention capable of characterizing circuit behavior for performance optimizing and issue debugging for the DUT.

An automatic impedance-matching method for a radiofrequency reception chain, which includes an antenna, an amplifier and a configurable impedance-matching network, arranged between the antenna and an input of the amplifier. The method includes two steps: acquiring measurement of a gain of the reception chain and of a noise level at an output of the amplifier and tuning the impedance-matching network according to the measurements. A radiofrequency reception chain allowing the method to be implemented is also provided.