Simultaneous transmission bidirectional repeater and initializat

Details Simultaneous transmission bidirectional repeater and initializat Simultaneous transmission bidirectional repeater and initializat

1996-12-13

1998-09-01

Westin, Edward P.

Electronic digital logic circuitry

Interface

Current driving

326 86, 326 23, H03K 190185

Patent

active

058015493

ABSTRACT:
The present invention provides a driver/receiver pair connected as a repeater circuit which simultaneously transmits and receives information on multiple connected transmission lines. Transceiver circuits are provided which are mirror images of one another to perform the repeater function of the present invention. Each transceiver in the repeater circuit includes a non-inverting buffer stage which produces a signal swing less than the typical Vdd to ground which is typical for common CMOS inverters. The limited swing provides a variable reference input to a differential receiver element. This receiver looks at the incoming signal, and the signal being transmitted from the repeater to determine if the incoming signal is logical "1" or logical "0". This is done on each side of the repeater since the actual voltage level on the wire at the repeater terminal is a composite of the signal received by the repeater and the signal being transmitted by the repeater. By using the repeater, the data rate is doubled and the transmission distance is increased when compared to simplex unidirectional operation.

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