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Flexible Low Characteristic Impedance Cable

IP.com Disclosure Number: IPCOM000093560D
Original Publication Date: 1967-Nov-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Rymaszewski, EJ: AUTHOR

Abstract

The method of connecting the regulating circuit of a power supply to the load which has varying current consumption, such as a group of switching circuits, must not produce an excessive series impedance which has a detrimental effect on regulator characteristics.

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Flexible Low Characteristic Impedance Cable

The method of connecting the regulating circuit of a power supply to the load which has varying current consumption, such as a group of switching circuits, must not produce an excessive series impedance which has a detrimental effect on regulator characteristics.

Paralleling a number of lines, each of which has a relatively high characteristic impedance, produces a composite low characteristic impedance system. Such a reduction in characteristic impedance is similar to that of a laminar bus, in terms of a reduced inductance.

The drawing has a twisted pair shielded by a wire braid in the center and a total of many insulated conductors wound around the center core in several layers. All layers have the same direction of twist. Wires in each layer are marked by two different colors of insulation. They are arranged in alternating fashion. That is, in each layer one color wire has two other color wires adjacent to it. A protective DACRON* braid is applied around the cable. The twisted pair can be used for remote sensing for the power supply regulating circuit.

An estimate of the achievable characteristic impedance is as follows. *Trademark of E. I. du Pont de Nemours and Co. Assume that the alternating conductors, wires, in a cable belong to the two terminals of a transmission line. The characteristic impedance of each wire is equal to or smaller than one half of that of a two-wire system. The total characteristic impedance...