Rohm Co., Ltd.

Yuji Yano

Toru Mukai

A transmission circuit includes a first terminal configured so that a first voltage is applied thereto, a second terminal, a third terminal, and a fourth terminal configured so that a second voltage lower than the first voltage is applied thereto. The transmission circuit further includes a first variable resistor portion provided between the first terminal and the second terminal, a first current restriction portion configured to restrict a current flowing from the first terminal to the second terminal, a second variable resistor portion provided between the third terminal and the fourth terminal, a second current restriction portion configured to restrict a current flowing from the third terminal to the fourth terminal, and a control portion configured to control, based on transmission data, the respective resistance values of the first variable resistor portion and the second variable resistor portion.

Transmission circuit, electronic control unit, and vehicle

A delay signal generation circuit includes first to nth (n representing a natural number equal to or larger than 2) delay circuits and first to nth output terminals. The delay signal generation circuit is configured such that, in a first mode, an input signal passes through the first to kth (k representing a natural number equal to or larger than 1 but equal to or smaller than n) delay circuits in order and reaches the kth output terminal, and in a second mode, the input signal passes through the kth to nth delay circuits in reverse order and reaches the kth output terminal.

Delay signal generation circuit, transmission circuit, electronic control unit, and vehicle

There is provided a differential signal transmission circuit that includes a first output terminal, a second output terminal connected to the first output terminal via a load resistor, a high-side transistor formed of a p-channel MOSFET and connected between an application terminal of a power supply voltage and the first output terminal, a low-side transistor formed of an n-channel MOSFET and connected between an application terminal of a ground potential and the second output terminal, a high-side pre-driver configured to drive the high-side transistor, a low-side pre-driver configured to drive the low-side transistor, a first resistance part connected between an output end of the high-side pre-driver and a gate of the high-side transistor, and a second resistance part connected between an output end of the low-side pre-driver and a gate of the low-side transistor.

Differential signal transmission circuit

A diode includes: a p-type semiconductor substrate; an n-type semiconductor layer; a p-type isolation region formed to surround a predetermined region of the n-type semiconductor layer on the p-type semiconductor substrate; an n-type buried layer formed across the p-type semiconductor layer and the n-type semiconductor layer within the predetermined region; an n-type collector wall formed in the n-type semiconductor layer; a p-type anode region and a plurality of n-type cathode regions formed in a diode formation region; and a p-type guard ring formed to surround the diode formation region in a region between the diode formation region of the surface layer of the n-type semiconductor layer and the p-type isolation region. A transistor for reducing a leakage current is formed by the p-type anode region, the p-type guard ring, and an n-type semiconductor between the p-type anode region and the p-type guard ring.

Diode and signal output circuit including the same

A transmitter includes a capacitor from one end of which a charge voltage is derived; a first constant current source to generate a charge current for the capacitor; a second constant current source to generate a discharge current for the capacitor; a charge/discharge controller to perform charge/discharge control of the capacitor based on a logic level of a transmission input signal and a comparison result between the charge voltage and a reference voltage; an output stage to generate the transmission output signal, wherein a slew rate of which is set in response to the charge voltage, and wherein an amplitude of the transmission output signal is set in response to an output side power source voltage; a reference voltage generator to fluctuate the reference voltage depend on the output side power source voltage; and a constant current controller to fluctuate a current value of the charge current and the discharge current depend on the reference voltage.

Growing community of inventors

Kyoto, Japan

Yuji Yano