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Browse Prior Art Database

Transmission Line Driver and Terminator

IP.com Disclosure Number: IPCOM000092704D
Original Publication Date: 1967-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Watkins, RV: AUTHOR

Abstract

Transmission of 125, 000 eight-bit bytes per second over cable 10 of length up to a mile in either direction is realized with this circuit arrangement. Pulse transformer 12 has line winding 14, driver winding 16 and a receiver winding 18 of the same number of turns. Transformer 12 has very low interwinding capacities for reducing common mode noise and ground shift between the ends of cable 10.

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Transmission Line Driver and Terminator

Transmission of 125, 000 eight-bit bytes per second over cable 10 of length up to a mile in either direction is realized with this circuit arrangement. Pulse transformer 12 has line winding 14, driver winding 16 and a receiver winding 18 of the same number of turns. Transformer 12 has very low interwinding capacities for reducing common mode noise and ground shift between the ends of cable 10.

Distortion is reduced by constructing transformer 12 to obtain a high- frequency, narrow-band response characteristic. Driver transistor 20 applies power supply voltage to cable 10 when + pulses are applied at the input terminals 22. The bit-time to space-time ratio is fixed by adjusting the network comprising capacitor 24 and resistors 26 and 28 to as high a value as possible.

The line termination is provided by resistors 32 and 24. The latter are switched to reference potential by transistors 36 and 38 in response to a negative potential at terminals 40 in the receiving mode. A threshold detector circuit comprising transistor 44 is adjusted by potentiometer 46.

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