Negative Impedances and the Twin 21-Type Repeater

29 July 1931

journal article
website
Published by Institute of Electrical and Electronics Engineers (IEEE) in Bell System Technical Journal

Vol. 10 (3) , 485-513
https://doi.org/10.1002/j.1538-7305.1931.tb01288.x

Abstract

This paper discusses negative resistances and impedances. It describes their properties and some devices by which they may be produced physically. Certain properties of negative impedances when used as series and shunt boosters for amplifying speech waves in telephone circuits are discussed. The paper concludes with a description of the circuit and properties of the twin 21-type repeater.

Keywords

NEGATIVE IMPEDANCES
TYPE REPEATER
BOOSTERS
TELEPHONE
TWIN
PROPERTIES
DISCUSSES NEGATIVE
NEGATIVE RESISTANCES