Bus transmission system

Pulse or digital communications – Repeaters – Testing

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Details

375 22, 307255, H03K 708, H03K 1700, H03K 1900

Patent

active

043887252

ABSTRACT:
A bus transmission system in which two or more drive circuits are connected to the same transmission line, wherein both ends of a transmission line are grounded via a terminal resistance where is nearly equal to the characteristic impedance of the line. The drive circuits have three states consisting of a low-level state in which the output impedance is small, a high-level state in which the output impedance is small and a high-impedance state in which the output impedance is very high. When data is not to be transmitted, the drive circuit is placed in the high-impedance state, when data is to be transmitted, the high-impedance state of one of the drive circuits is converted into the low-level state in which the output impedance is small so that data can be transmitted based upon the low-level state and the high-level state, and when the transmission of data is finished, the drive circuit is placed in the low-level state again and thereafter placed in the high-impedance state. The data to be transmitted is modulated by a pulse width modulation device that uses a return to zero amplitude method as part of the modulation.

REFERENCES:
patent: 3237164 (1966-02-01), Evans
patent: 3780316 (1973-12-01), Wilhelm
patent: 3858059 (1974-12-01), Khanna
patent: 4083005 (1978-04-01), Looschen
patent: 4101734 (1978-07-01), Dao
patent: 4186379 (1980-01-01), Knoblock et al.
"Elektronik", vol. 27, No. 4, 4/1978, pp. 62-64.

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