Browse Prior Art Database

Broadband Directional (Bridged T) Signal Generator

IP.com Disclosure Number: IPCOM000085161D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Stuckert, PE: AUTHOR

Abstract

The circuit illustrated in the figure comprises a broadband directional signal generator including a conventional bridged-T attenuator. This circuit can be used in analog or digital systems to generate two-way signal flow with a minimum number of components.

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Broadband Directional (Bridged T) Signal Generator

The circuit illustrated in the figure comprises a broadband directional signal generator including a conventional bridged-T attenuator. This circuit can be used in analog or digital systems to generate two-way signal flow with a minimum number of components.

The circuit generates signals on a transmission line which controllably propagate in one direction on the line to the exclusion of the other direction, or in both directions. Such signal generation may occur at one or a multiplicity of points located at arbitrary positions along the line.

The signal generator includes a conventional bridged-T attenuator network and operates in conjunction with other circuitry. As will be noted the above bridged-T attenuator is symmetrical and may be driven by push-pull amplifiers with current outputs connected to the attenuator nodes. It will be noted that two resistors R1, R3 and R4 comprise the attenuator.

The amplifiers utilize direct coupling and have frequency responses which are flat and flat to DC. Where operation down to DC is not required, reactive coupling may be used. The circuit has application in both analog and digital communication paths where two-way information flow exists, and where multiplicity of ports may share the same paths.

The design equations for the described directional signal generator are: R1 = Z(0) R4 = Z(K-1) R3 = Z(0)/(K-1) GDD = (2 over Z(0)) (K over K-1) where K is the ratio of the attenuato...