Browse Prior Art Database

Bipolar Transmission Line Driver

IP.com Disclosure Number: IPCOM000090591D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Hippert, RO: AUTHOR

Abstract

This technique is for obtaining a bipolar pulse for transmission over a twisted-pair telephone cable from a single pulse input. In addition, it utilizes a single power supply. Most of the circuits can be implemented in an integrated circuit package. Since bulky pulse transformers are not required. The length of the transmission line is dependent upon the sensitivity of the receiver. However, lengths of up to one thousand feet using a No. 22 AWG twisted pair can be attained for data rates of 500,000 bits per second.

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Bipolar Transmission Line Driver

This technique is for obtaining a bipolar pulse for transmission over a twisted-pair telephone cable from a single pulse input. In addition, it utilizes a single power supply. Most of the circuits can be implemented in an integrated circuit package. Since bulky pulse transformers are not required. The length of the transmission line is dependent upon the sensitivity of the receiver. However, lengths of up to one thousand feet using a No. 22 AWG twisted pair can be attained for data rates of 500,000 bits per second.

When a positive pulse is applied to the 1 input, it is inverted and used to drive positive And 10. The output of And 10 turns transistor T1 on. The output of And 10 is also inverted and turns transistor T3 on. thus establishing a transmission path from +ECC through R1 and T1, one side of the twisted pair transmission line, RL, the other side of the transmission line, T3 and R3 to ground. The positive pulse is also applied to a single-shot and the negative-going transition sets the single-shot. The timeout of the single-shot circuit is adjusted so that the pulse width at point X is equal to the input pulse width at the 1 input. The delayed pulse thus generated is applied to positive And 11. The output of And 11 turns transistors T2 and T4 on. As soon as T2 and T4 are on, a path is established from +ECC through R2 and T2. one side of the twisted pair transmission line, RL, the other side of the twisted pair transmission l...