TFS248E_0208 Datasheet, PDF (1/1 Pages) Vectron International, Inc – Application Note

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VI TELEFILTER
version 2.0
Application Note
05.04.2002
TFS 248E - 1/1
1. General
The filter is designed for single ended use at the input and at the output.It is matched
to 50 Ω.
The terminating impedances are
Input :
560Ω || - 5,9 pF
Output:
500Ω || - 6,3 pF
The matching element values given below are calculated from the terminating
impedances. If the values of the matching elements are not equal to standard values
the best standard values are given in brackets. Because these are theoretical values
they have to be modified on PCB’s corresponding to the existing parasitics.
2. Theoretical matching to 50 Ω single ended
Input
50 Ohm
L1
1
L3
6
SAW
L2
L4
2,3,4,5,7,8,9,10
Output
50 Ohm
The theoretical values of the stated elements are:
L1 = 110 nH (100nH)
L3 = 100 nH
L2 = 170 nH (180 nH)
L4 = 170 nH (180 nH)
VI TELEFILTER
Potsdamer Straße 18
D 14 513 TELTOW / Germany
Tel: [phone] / Fax: [phone]
E-Mail: [e-mail]
Vectron International, Inc.
267 Lowell Road
Hudson, NH 03051 / USA
Tel: [phone] Fax: [phone]
E-Mail: [e-mail]
VI TELEFILTER reserves the right to make changes to the product(s) and/or information contained herein without notice. No liability is
assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.