<i>L5 System</i>: Ultralinear Transistors

D'Altroy, F. A.; Jacobs, Richard M.; Nacci, J.M.; Panner, E. J.

doi:10.1002/j.1538-7305.1974.tb02735.x

Bell System Technical Journal

1974

DOI: 10.1002/j.1538-7305.1974.tb02735.x

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L5 System: Ultralinear Transistors

F. A. D'Altroy¹,

Richard M. Jacobs²,

J.M. Nacci³

et al.

Abstract: A family of ultralinear npn transistors has been developed for use in the L5 coaxial‐carrier system. These 3‐GHz devices are characterized by extremely low distortion and noise figure. The transistor comprises an interdigitated base‐emitter structure with a heavily doped base grid connected to the peripheral base metal contact. The emitter contact is overlaid on the base‐emitter region. Contact metallurgy consists of a platinum silicide, titanium, platinum, and gold system. The transistor is a highly reliable … Show more

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1976

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L5 System: Overall Description and System Design

Kelcourse¹,

Herr²

1974

Bell System Technical Journal

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The L5 Coaxial-Carrier Transmission System is a new solid-state broadband system designed to transmit 10,800 long-haul message channels on standard %-inch (9.5-mm) coaxial cable. Alternatively, high-speed digital signals may be transmitted in selected mastergroups. This paper contains an overall system description and describes in detail system design considerations such as the transmission plan, frequency allocation, and 4000-mile noise performance. Also considered are the significant proper ties of the coaxial medium, the ways they affect the hierarchy of equalizers traditionally found in long-haul coaxial systems, and the manner in which the several levels of equalization relate to each other and to the fundamental transmission phenomena within the system.

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L5 System: Overall Description and System Design

Kelcourse¹,

Herr²

1974

Bell System Technical Journal

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L5 System: Repeatered Line

Angell¹,

Cho²,

Kretsch³

et al. 1974

Bell System Technical Journal

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The L5 repeatered line is presented from the viewpoint of a distributed equalization process. Reliable transmission of 10,800 circuits over 4000 miles of coaxial cable with minimum noise is the sole objective of this process. The strategy is to provide equalization in cause‐associated increments that place specific bounds on signal‐level excursions, thereby insuring an ultralinear, low‐noise predictable transmission medium. The individual causes of signal misalignment, both static and dynamic, are examined and the realization of the strategy, which forms a hierarchy of equalizers, is described.

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Transistor design for low distortion at high frequencies

Abraham

Meyer

1976

IEEE Trans. Electron Devices

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L5 System: Ultralinear Transistors

Cited by 3 publications

References 4 publications

L5 System: Overall Description and System Design

L5 System: Overall Description and System Design

L5 System: Repeatered Line

Transistor design for low distortion at high frequencies

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