| 摘要 |
PURPOSE:To realize the transmission of an asynchronous series multiplied signal with N:1 bus connection, by reducing the waveform distortion noise according to the matching termination of branch lines and at the same time constituting a transmitting circuit so as to release an output during pause of transferring to prevent the disturbance to the data under the transfering. CONSTITUTION:A branching device is inserted to each branch point of the bus connection to have the matching termination. Thus the waveform distortion noise is reduced to increase the transfer speed of data. At the same time, each transmitting circuit which transmits the balanced signal is constituted so as to release the output when the data is not transferred and when the power supply voltage is applied and cut off. For instance, the transmitting circuits 1-4 are connected to the branching devices 13-15 via the corresponding AC supply circuits 5-8 and branch transmission lines 9-12; and at the same time the termination resistances 16-19 are added to the output of the circuits 1-4. Then the devices 13-15 are connected via a main transmission lines 20- 21, and the other end of the branching device 15 is connected successively to a main transmission line 22, an AC coupling circuit 23 and a receiving circuit 24 in that order. At the same time, a termination resistance 25 is added to the input of the circuit 24. |
