TFS468L Datasheet, PDF (1/2 Pages) Vectron International, Inc – Application Note

Ltp: tft035
VI TELEFILTER
version 1.0
Application Note
TFS 468L
10.05.2007
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 single driven source and load impedances of the filter are:
Source impedance:
Load impedance:
120 Ω || -9 pF
70 Ω || -12 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
L1 = 18nH
C1 =15pF
10
4
12
6
1,2,3,5,7,8,9,11
L2 = 15nH
C2 = 15pF
L2
C2
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assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.