Patent ID: 7446567

Claim:
A signal transmission apparatus, comprising: a signal transmission line having a transmitting end, a receiving end, and a characteristic impedance, including a signal-line element having a resistance-capacitance delay, for transmitting a digital signal input at the transmitting end; a first driver having an inverter structure and an on-resistance, for supplying the digital signal to the transmitting end of the signal transmission line; a power-ground transmission fine pair for supplying power to the first driver, having a characteristic impedance less than a sum of the on-resistance of the first driver and the characteristic impedance of the signal transmission line, the power-ground transmission line pair including a power line and a ground line, the power line and the ground line running adjacent to each other; a first receiver having a differential amplifier structure, for receiving the digital signal from the receiving end of the signal transmission line and detecting the received digital signal; and a first directional coupler connected between the first driver and the transmitting end of the signal transmission line, or between the receiving end of the signal transmission line and the first receiver, for blocking a direct-current component of the digital signal and passing a wideband alternating-current component of the digital signal.