MF604F Ver la hoja de datos (PDF) - Unspecified

Número de pieza

componentes Descripción

Fabricante

MF604F

Micro filter for South Africa

Unspecified 

Product Specification

MF604F

4.5.2 . Return loss from line side test setup :

Return loss measures the amount of lost energy due to reflection resulted from

impedance mismatching at the interface. Return loss is essentially defined as the ratio

of the incident power upon a given transmission system to the reflective power caused

by impedance mismatch with respect to reference impedance at the interface between

source and device. Return loss figure is a function of the impedance of the circuit

involved and therefore frequency dependent. These impedance must be closely

maintained in order to reduce the possibility of undesirable reflection and echoes

which results from long distance circuit of the telephone user and may destroy the data

being sent. To perform the return loss test , open ,short and load calibration must be

done prior measurement while the LCZ impedance analyzer being selected in

impedance mode. Return loss is general expressed in decibels.

General return loss equation is listed: Return loss = 20 log ZL + ZM / ZL - ZMdB

Where ZL = the reference impedance ZM = the measured impedance

The test setup is shown in drawing below:

NOTE :

ZSL=82 ohm + ( 600 ohm // 68 nf )

Note : ZR = 270 ohm + ( 750 ohm // 150nf )

Data sheet subject to change without notice

RDPS-MF050(R0)08/27/2002

SHEET 9 OF 12

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