TFS210G_03 Datasheet, PDF (1/2 Pages) Vectron International, Inc – Application Note

Ltp: tft029
VI TELEFILTER
version 1.2
Application Note
04.06.03
TFS 210G
1/2
1. General
The filter is single ended driven. It is matched to 50 Ω.
The matching element values given below are valid on the test PCB. If the parasitics on the
customer PCB and on this PCB are different, the matching elements have to be optimised
regarding the circuit and PCB design.
The matching elements have been chosen from the E12- series (European standard series
with fixed tolerances).
2. Theoretical matching
The termination impedances of the filter are:
source impedance:
860 Ω || - 6,4 pF
load impedance:
1160 Ω || - 6,7 pF
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.
50 Ω test circuit
L1 ₁
Input
50 Ohm
C1
SAW
6 ^L2
C2
2,3,4,5,7,8,9,10
Output
50 Ohm
L1 = 100,8 nH
C1 = 30 pF
L2 = 96,4 nH
C2 = 33,8 pF
TELEFILTER GmbH
Potsdamer Straße 18
D 14 513 TELTOW / Germany
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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.