TFS468F Datasheet, PDF (1/2 Pages) Vectron International, Inc – Application Note

Ltp: TFP7x5B
VI TELEFILTER
version 1.2
Application Note
25.01.2007
TFS 468F
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 parasites 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 E08- series (European standard series
with fixed tolerances).
2. Theoretical matching
The terminating impedances of the filter are:
source impedance:
1260 Ω || - 3,4 pF
load impedance:
1020 Ω || - 4,0 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
C1
10
4
12 ^SAW
6
1, 2, 3, 5, 7, 8, 9, 11
L2
C2
L1 = 37,8 nH
C1 = 16,5 pF
L2 = 34,1 nH
C2 = 16,5 pF
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D 14 513 TELTOW / Germany
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