Rohm Co., Ltd.

Shinya Masuda

Toru Mukai

Satoshi Tanaka

Hiroki Yamakami

Tomohiro Nishimura

A communication system is configured to use a pulse width modulation signal as transmission code among a plurality of nodes connected to a communication line. A master node includes a transmission transistor connected to the communication line, a detector configured to detect a variation in current during the on-period of the transmission transistor, and a communication circuit configured to determine the off-timing of the transmission transistor based on the timing of occurrence of the variation in current (i.e., the on-timing of a second transmission transistor provided in a slave node). For example, the communication circuit can be configured to determine the off-timing of the transmission transistor such that the simultaneously-on period TB of the transmission transistor and the second transmission transistor fulfills TB=(2n−1)/2f, where f is the frequency of EMI noise.

Communication device and communication system

An analog-to-digital (AD) conversion circuit includes an analog filter configured to remove a high frequency component of an analog signal to generate a first signal, an AD converter (ADC) configured to AD-convert the first signal to generate a second signal, and a digital filter configured to remove a high frequency component of the second signal to generate a digital signal.

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Kyoto, Japan

Shinya Masuda