Patent ID: 8278966

Claim:
A signal output circuit configured to output a signal onto a transmission line having a given transmission characteristic, the signal output circuit comprising: output circuitry which is connected to an output stage of a drive circuit and capable of adjusting an output signal waveform according to a resistance of the output circuitry, wherein circuit portions of the output circuitry are selectively activated to alter the resistance of the output circuitry in order to improve output signal characteristics for signals transferred via the transmission line, and further wherein at least one or both of the output resistance and the current driving capability is altered to improve signal transfer characteristics, and the output resistance and/or current driving characteristics are altered depending upon determined characteristics of the transmission line which is a flexible transmission line having transmission characteristics that are altered based on movement of the flexible transmission line, wherein different adjustment procedures are implemented depending upon whether ringing in a signal waveform transferred by the flexible transmission line is caused by a large resonance Q value for the flexible transmission line or insufficient current driving capability for an IC output.