Renesas Electronics Corporation

Renasas Electronics Corporation

Kouichi Yamaguchi

Koichi Nose

Shunichi Kaeriyama

Provided is a receiving circuit that operates in a power supply system different from a transmitting circuit outputting a transmission signal and receives the transmission signal through an AC coupling device where a primary coil through which the transmission signal flows and a secondary coil having a center tap to which a specified voltage is supplied from an external terminal are magnetically coupled, which includes a pulse width amplifier circuit that holds pulse signals appearing at both ends of the secondary coil for a specified period of time and outputs them as hold signals, respectively, and a differential amplifier that compares a voltage of the hold signal and a voltage of the hold signal and outputs a comparison result.

Receiving circuit and signal receiving method

In a related transmitting circuit employing electromagnetic induction that is used in a communication system, there is a problem in that, because only one inductor is used in the transmitting circuit, it is impossible to perform communication at a data rate higher than the self-resonant frequency of the inductor. A transmitting circuit according to an embodiment of the present invention is a transmitting circuit that drives an inductor to transmit data to a semiconductor chip insulated from a semiconductor chip on which the transmitting circuit is mounted, and includes a driving circuit that receives outgoing data transmitted at a data rate higher than the self-resonant frequency of the inductor and outputs an outgoing signal that drives the inductor at the data rate of the outgoing data.

Inductive-coupling system and method with compensation to prevent interference

A transmitting circuit that includes a driving circuit that drives an inductor to transmit data to a semiconductor chip insulated from a semiconductor chip on which the transmitting circuit is mounted. The driving circuit receives an outgoing data, compensates wave distortion of the outgoing data generated from the self-resonance of the inductor, generates a compensated outgoing data, and outputs the compensated outgoing data to drive the inductor, such that the outgoing data is transmitted at a data rate higher than the self-resonant frequency of the inductor.

High data-rate magnetic coupling communication is realized with a small circuit size without sacrificing the communication distance. A received data acquisition circuit performs a decision-feedback equalization process on a received signal to obtain a shaped signal, and also performs sampling of the shaped signal with a sampling rate equal to or higher than a self-resonant frequency, according to a sampling clock, to obtain a data sample. A midpoint sample acquisition circuit performs sampling of the received signal at an intermediate timing of a sampling timing of the received data acquisition circuit to obtain a midpoint sample. A phase adjustment circuit adjusts a phase of the sampling clock, based on the data sample and the midpoint sample.

Growing community of inventors

Kanagawa, Japan

Kouichi Yamaguchi