Patent ID: 8477855

Claim:
A signal transmission system for transmitting data among a plurality of semiconductor chips using a transmitting coil and a receiving coil inductively coupled to the transmitting coil, comprising: a transmitting circuit that includes the transmitting coil and a transmit-current generating unit that includes a transmit-timing control circuit and a transmit-current generating circuit, the transmit-timing control circuit receiving a transmit clock to generate a pulse having a predetermined pulse width, at a predetermined timing from every rising edge or falling edge of the transmit clock, the pulse being supplied to the transmit-current generating circuit, as a timing signal for supplying a first current through the transmitting coil, the transmit-current generating circuit receiving the data and the timing signal to supply the first current through the transmitting coil in a direction corresponding to “ 1 ” or “ 0 ” polarity of the data during a time when the pulse of the timing signal is activated; and a receiving circuit that includes the receiving coil and a receive-data reproducing circuit that captures voltage induced in the receiving coil due to the first current flowing through the transmitting coil, at every rising edge or falling edge of a receive clock, reproduces data transmitted and outputs the reproduced data.