Digital signal transmission circuit and method of designing it

摘要

A digital signal transmission circuit which uses a MOS type LSI ( 1 ) or the like having, e.g., an FET ( 3 ), and which is so configured that a step waveform produced from a transmission terminal such as an FET output terminal ( 4 ) reaches a reception terminal such as an FET input terminal ( 5 ) via a signal line. A signal line is added with a resistance component in a distributed manner at part or whole thereof. The resistance component may have set therein in advance a voltage drop due to the transmission loss of a signal line so that the amplitude of a transmission signal is damped at a reception terminal to a specified percentage of that at a transmission terminal. For example, it is preferable that the wire and wire length of a signal line be properly selected to serve as an addition to a resistance component so that a voltage drop is almost equal to ½ the amplitude of a transmission signal.