TFS248C_04 Datasheet, PDF (1/2 Pages) Vectron International, Inc – Application Note

Pcb: tft030
VI TELEFILTER
version 1.0
Application Note
05.10.01
TFS 248C - 1/2
1. General
The filter is matched to 50 Ω single ended at the input and to a 200 to 50 Ω balun at
the output.
2. Theoretical matching
The matching element values given below are valid theoretically. The matching
elements have to be optimised regarding the circuit and PCB design and existing
parasitics.
The termination impedances of the filter are:
source impedance:
63 Ω || - 1,7 pF
load impedance:
63 Ω || - 1,7 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
Input
C1
L1
1
SAW
L2
6
C2
2,3,4,5,8,9,10
7
L3
LB-OUT
200Ohm : 50 Ohm
L1 = 60 nH
C1 = 25 pF
L2 = L3 = 30 nH
C2 = 4,7 pF
VI TELEFILTER
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Vectron International, Inc.
267 Lowell Road
Hudson, NH 03051 / USA
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E-Mail: [e-mail]
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