A phase shifter unit cell or a connected set of such cells that can be well isolated from external circuitry and which do not introduce insertion loss into an RF signal path, exhibit good return loss, and further provides additional advantages when combined with bracketing attenuator circuits. More particularly, embodiments integrate a high-isolation function within a phase shifter circuit by breaking the complimentary nature of the control signals to a phase shifter cell to provide greater control of switch states internal to the phase shifter cell and thus enable a distinct high-isolation state, and by including a switchable shunt termination resistor for use in the high-isolation state. Some embodiments are serially coupled to attenuator circuits to enable synergistic interaction that reduces overall die size and/or increases isolation. One such embodiment positions a high-isolation phase shifter cell in accordance with the present invention between bracketing programmable attenuators.

An attenuation circuit comprises a signal propagation path and a plurality of shorting units (e.g., devices) sequentially attached to the signal propagation path. In some embodiments, each of one or more initial shorting units of the plurality of shorting units have a dominant intermodulation product term for a full amplitude signal that is less than that of each of one or more subsequent shorting units of the plurality of shorting units. In some embodiments, each of one or more initial shorting units are less sensitive to control voltage changes than each of one or more subsequent shorting units. In some embodiments, each of one or more initial shorting units provide higher levels of attenuation than each of one or more subsequent shorting units. A method includes providing the above attenuation circuit and controlling a level of attenuation provided by each shorting unit of the plurality of shorting units.

An electronic device includes a transceiver connected to a differential signal transmission line for transmitting a differential signal through a pair of signal lines to communicate with one or a plurality of other devices connected to the differential signal transmission line. The electronic device includes: a suppression circuit that is operated by a power source voltage to suppress waveform distortion in the differential signal transmitted through the differential signal transmission line; and a power source controller that controls supply or cutoff of the power source voltage to the suppression circuit in response to a change in a differential voltage between the pair of signal lines.

An active filter reduces Electro-Magnetic Interference (EMI) created by current flowing through a power line. The active filter connects to the power line at a single node through a connection capacitor. A sense current flows through the connection capacitor when the power line current changes. This sense current is applied to a gain control circuit having cross-coupled PNP transistors that drive currents to both terminals of a variable capacitor. The variable capacitor converts these currents to a voltage that is injected back into the power line through the connection capacitor as an injected compensation voltage that compensates for the sensed current.

A reflection attenuation device for a bus of a bus system and a method for attenuating reflections during a data transfer in a bus system. The reflection attenuation device may close off a free end of bus lines of the bus in a transceiver device of a user station of the bus system. Alternatively, the reflection attenuation device may be connected to a branch point of the bus which is a star point or is used to connect a user station to the bus. Thus, bus users in a vehicle trailer are also connectable to the bus system of the vehicle, as needed. The reflection attenuation device includes at least one pair of electrical semiconductor components connected in parallel, and at least one capacitor that is connected in series to the pair of electrical semiconductor components connected in parallel, for attenuating reflections on a bus line of the bus.

A reflection attenuation device for a bus of a bus system and a method for attenuating reflections during a data transfer in a bus system. The reflection attenuation device may close off a free end of bus lines of the bus in a transceiver device of a user station of the bus system. Alternatively, the reflection attenuation device may be connected to a branch point of the bus which is a star point or is used to connect a user station to the bus. Thus, bus users in a vehicle trailer are also connectable to the bus system of the vehicle, as needed. The reflection attenuation device includes at least one pair of electrical semiconductor components connected in parallel, and at least one capacitor that is connected in series to the pair of electrical semiconductor components connected in parallel, for attenuating reflections on a bus line of the bus.

An attenuator circuit is provided. The attenuator circuit includes a first input node and a second input node each configured to receive a respective one of a first input signal and a second input signal forming a differential input signal pair. Further, the attenuator circuit includes a first plurality of resistive elements coupled in series between the first input node and a first output node for outputting a first output signal. The attenuator circuit additionally includes a second plurality of resistive elements coupled in series between the second input node and a second output node for outputting a second output signal. In addition, the attenuator circuit includes a shunt path coupled to a first intermediate node and a second intermediate node. The first intermedia node is arranged between two resistive elements of the first plurality of resistive elements. The second intermedia node is arranged between two resistive elements of the second plurality of resistive elements. The shunt path comprises a switch circuit configured to selectively couple the first intermediate node and the second intermediate node based on one or more control signals.

An attenuator circuit is provided. The attenuator circuit includes a first input node and a second input node each configured to receive a respective one of a first input signal and a second input signal forming a differential input signal pair. Further, the attenuator circuit includes a first plurality of resistive elements coupled in series between the first input node and a first output node for outputting a first output signal. The attenuator circuit additionally includes a second plurality of resistive elements coupled in series between the second input node and a second output node for outputting a second output signal. In addition, the attenuator circuit includes a shunt path coupled to a first intermediate node and a second intermediate node. The first intermedia node is arranged between two resistive elements of the first plurality of resistive elements. The second intermedia node is arranged between two resistive elements of the second plurality of resistive elements. The shunt path comprises a switch circuit configured to selectively couple the first intermediate node and the second intermediate node based on one or more control signals.

A transmission-end impedance matching circuit operates according to a signal of an overvoltage signal source and includes a first level shifter, a voltage generating circuit, and an impedance matching circuit. The first level shifter generates a first conversion voltage according to a source signal and operates between a first high voltage and a ground voltage. The voltage generating circuit generates a second high voltage according to the first conversion voltage, the first high voltage, and a medium voltage. The impedance matching circuit includes a second level shifter, a transistor, and two resistors. The second level shifter generates a gate voltage according to the second high voltage, a low voltage, and an input signal. The transistor is turned on/off according to the gate voltage and has a withstand voltage lower than the first high voltage. Each of the two resistors is coupled between the transistor and a differential signal transmission end.

An attenuator arrangement comprising at least a first attenuation path configured to couple between a signal processing chain, SPC, and a measurement apparatus; said SPC comprising a first and second SPC terminal, said SPC configured to apply one or both of a gain and phase change on a signal passed between the SPC terminals; said measurement apparatus configured to measure one or both of the gain and the phase change applied by SPC by coupling to and receiving signals from said SPC terminals; wherein one of said first SPC terminal and said second SPC terminal is coupled to the measurement apparatus through said first attenuation path; and wherein the at least first attenuation path of the attenuator arrangement is configured to provide, selectively, for attenuation of the signal to the measurement apparatus to make the signal power of the signals from said SPC terminals more equal.