A transmitter is provided. The transmitter includes a bus system including at least two bus lines. Further, the transmitter includes an envelope tracking circuit coupled to the at least two bus lines, and a plurality of power amplifiers. At least a first one of the plurality of power amplifiers, while in active state, is configured to selectively couple its input to the one of the at least two bus lines which is supplied with a supply voltage or a bias signal by the envelope tracking circuit that is based on an envelope of a first baseband signal related to a first radio frequency signal received by the first one of the plurality of power amplifiers for amplification.

An LVDS driver circuit includes: a current source; a differential unit configured to receive a first input signal and a second input signal and output a first output signal and a second output signal; and a feedback control circuit configured to be coupled to a first output node and a second output node and to perform, by outputting a control voltage to a gate of a transistor, feedback control that sets a common voltage of a differential output signal. In the differential unit, the first output node and the second output node are in a high impedance state in the high impedance mode, the differential unit is configured to output the first output signal and the second output signal in the signal output mode, and the control voltage in the high impedance mode is larger than the control voltage in the signal output mode.

To obtain a communication apparatus capable of reducing the consumption of electric power.

A communication system according to the present disclosure includes a transmitter that generates a first signal including communication data and sends the first signal through a communication terminal in a first operation mode, and that generates a second signal including a predetermined first signal pattern and having a transition rate lower than the first signal and sends the second signal through the communication terminal in a second operation mode, and a controller that sets an operation mode for the transmitter to either of a plurality of operation modes including the first operation mode and the second operation mode.

A transceiver for imparting a voltage signal on a differential signaling bus, involving an output terminal and a string of one or more transistors connected between the output terminal and a predetermined voltage level. The transceiver can be switched between an active state in which the predetermined voltage level is applied to the output terminal, and an inactive state in which the predetermined voltage level is not applied to the output terminal. Methods for the transceiver can involve a detection step of detecting a first quantity depending on a current flowing through a first transistor in the string of transistors, a failure determination step of determining whether the detected first quantity satisfies one or more error conditions, and a control step of switching the transceiver to the inactive state if the detected first quantity is determined to satisfy at least one of the one or more error conditions.

The present invention provides an in-vehicle processing device and an in-vehicle system capable of reducing power consumption while suppressing quality degradation of data to be transmitted and received. An ECU includes a data transmission and reception device for transmitting and receiving data and an MPU for controlling the data transmission and reception device. The data transmission and reception device includes a filter device and a steady current suppression circuit. The filter device attenuates noise that is superimposed on data by reflection of the data. The steady current suppression circuit suppresses a steady current flowing through the filter device and facilitates a transient current flowing through the filter device.

A ringing suppression circuit is provided at one or more nodes each having a communication circuit executing communication with another node by transmitting a differential signal through a pair of communication lines connected to the nodes. The operation controller is configured to shift a mode of the suppressor to a normal-operation mode when the differential signal is transmitted through the pair of communication lines, and to shift the mode of the suppressor to a low-current operation mode when the differential signal is not transmitted through the pair of communication line. A current consumption of the suppressor is less in the low-current operation mode than the normal-operation mode. The suppressor and the operation controller are configured to receive permanent power from a DC power supply, and the communication circuit is configured to receive power from the DC power supply via a power supply switch.

A ringing suppression circuit is provided at one or more nodes each having a communication circuit executing communication with another node by transmitting a differential signal through a pair of communication lines connected to the nodes. The operation controller is configured to shift a mode of the suppressor to a normal-operation mode when the differential signal is transmitted through the pair of communication lines, and to shift the mode of the suppressor to a low-current operation mode when the differential signal is not transmitted through the pair of communication line. A current consumption of the suppressor is less in the low-current operation mode than the normal-operation mode. The suppressor and the operation controller are configured to receive permanent power from a DC power supply, and the communication circuit is configured to receive power from the DC power supply via a power supply switch.

The present invention provides an in-vehicle processing device and an in-vehicle system capable of reducing power consumption while suppressing quality degradation of data to be transmitted and received. An ECU includes a data transmission and reception device for transmitting and receiving data and an MPU for controlling the data transmission and reception device. The data transmission and reception device includes a filter device and a steady current suppression circuit. The filter device attenuates noise that is superimposed on data by reflection of the data. The steady current suppression circuit suppresses a steady current flowing through the filter device and facilitates a transient current flowing through the filter device.

A subscriber station for a bus system and a method for improving the reception quality in the bus system are provided. The subscriber station includes an acquisition device for acquiring a bus state of a bus of the bus system, and a symmetrization device for the symmetrization, on the basis of the result of the acquisition device, of the bit durations and/or of the delay time durations of the rising and falling edge of a bit of signals received from the bus.

Embodiments of the invention are generally directed driving data of multiple protocols through a single set of pins. An embodiment of an apparatus includes a transmitter connected to two pads on an IC the transmitter including a differential driver to transmit a differential signal, wherein the differential driver has a first branch and a second branch, each branch of the differential driver including a protection device connected to one of the pads; and a common mode driver to transmit a common mode signal, the common mode driver having a first branch and a second branch, each of the branches of the common mode driver including a protection device connected to one of the pads. The first and second switch devices are not turned on simultaneously, based on data to be transmitted, one of the switch devices being turned on and the other being turned off. The third and fourth switch devices are both turned on when the common mode signal is one of a logic HIGH or logic LOW and both turned off when the common mode signal is the other of a logic HIGH or logic LOW.