Patent ID: 7505521

Claim:
A data transmission system, comprising: a transmitter comprising; a divider circuit converting a data output strobe signal into a plurality of divided data strobe signals, each divided data strobe signal having a lower frequency than the data output strobe signal, a first plurality of differential output amplifiers transmitting differential data signals via a plurality of differential signal line pairs, a second plurality of differential output amplifiers, each one of the second plurality of differential output amplifiers receiving the divided data strobe signal and generating an output control signal, and a plurality of signal level varying circuits, wherein each signal level varying circuit variably current loads a corresponding differential signal line pair in responsive to the output control signal received from a corresponding one of the second plurality of differential output amplifiers; and a receiver comprising; a first plurality of differential input amplifiers receiving the differential data signals from the plurality of differential signal line pairs, a plurality of signal level detecting circuits, each signal level detecting circuit detecting a variation in the differential data signals on a corresponding differential signal line pair and generating an input control signal in response to the variation; a second plurality of differential input amplifiers, each one of the second plurality of differential input amplifiers receiving the input control signal from a corresponding signal level detecting circuit and generating a corresponding data strobe signal portion, and a multiplier receiving a plurality of data strobe signal portions from the second plurality of differential input amplifiers, and generating a data input strobe signal having a higher frequency than the plurality of data strobe signal portions and corresponding to the data output strobe signal.