Patent ID: 8253444

Claim:
A receiving circuit, comprising: an impedance compensating circuit, including: a first input terminal and a second input terminal coupled to a first signal line and a second signal line, respectively, a first signal and a second signal being transmitted at the first input terminal and the second input terminal respectively, the first and second signals being differential signals; a signal input circuit, coupled to the first input terminal and the second input terminal, configured to receive the first signal and the second signal; and a differential-signal detector configured to detect whether or not the first and second signals are supplied to the first input terminal and the second input terminal; wherein the impedance compensating circuit is coupled to the differential-signal detector in parallel at the first input terminal and the second input terminal, wherein the differential-signal detector is configured to cause a first current to flow to the first input terminal when a potential of the second signal is higher than a potential of the first signal, and when the first signal and the second signal have a first potential difference, wherein the differential-signal detector is configured to cause a second current to flow to the first input terminal when the potential of the second signal is higher than the potential of the first signal, and when the first signal and the second signal have a second potential difference, wherein the impedance compensating circuit is configured to cause a third current to flow to the first input terminal when the potential of the second potential is higher than the potential of the first signal, and when the first signal and the second signal have the first potential difference, and wherein the impedance compensating circuit is configured to cause a fourth current to flow to the first input terminal when the potential of the second potential is higher than the potential of the first signal, and when the first signal and the second signal have the second potential difference.