TFS211B Datasheet, PDF (3/5 Pages) Vectron International, Inc – Filter specification

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V_{__}I_{__}T_{__}E_{_}L_{__}E_{__}F_{_}I_{_}L_{_}T_{__}E_{_}R_{_______________________}F_{__}il_{_}t_{_}e_{_}r_{___}s_{_}p_{__}e_{_}c_{_}i_{_}f_{_}i_{_}c_{_}a_{_}t_{_}i_{_}o_{_}n_{___________________}T_{__}F_{_}S_{___}2_{__}1_{_}1_{__}B_{________}3_{__}/5_{_}
50 Ω test circuit1
The values of the matching elements which are given below are calculated from the source and load impedance.
If the values of the matching elements are not equal to standard values the best standard values are given in
brackets. If standard matching elements instead of the exact values are used it can not be guaranteed that the
specification will be fulfilled.
Because these are theoretical values they have to be modified on PCB’s corresponding to the existing parasitics.
L1
Input
50 Ohm
11
SAW
L2
L3
5
L4
Output
50 Ohm
1,2,3,4,6,7,
8,9,10,12
L1 = 150 nH
L3 = 140 nH (150 nH)
L2 = 220 nH
L4 = 220 nH
This circuit is used for all measurements at Telefilter.
50 Ω test circuit2
Input
50 Ohm
L1 ₁₁
C1
SAW
5 ^L2
C2
Output
50 Ohm
1,2,3,4,6,7,
8,9,10,12
If this kind of matching circuit is used the filter will also fulfill the specification in passband. But in the stopband at
fc + 80MHz ... fc + 2GHz the specification can’t be fulfilled without using an additional lowpass. If no lowpass is
used the typical attenuation in that area will be about 30 dB.
______________________________________________________________________________________________________
VI TELEFILTER
Vectron International, Inc.
Potsdamer Straße 18
267 Lowell Road
D 14 513 TELTOW / Germany
Hudson, NH 03051 / USA
Tel: [phone] / Fax: [phone]
Tel: [phone] Fax: [phone]
E-Mail: [e-mail]
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.