TFS1575L Datasheet, PDF (1/1 Pages) Vectron International, Inc – The filter is matched to 50 Ω single

ltp:tfs3x3b
VI TELEFILTER
Version 1.0
Application Note
TFS1575L
14-03-2006
1/1
1. General
The filter is matched to 50 Ω single ended at input and output.
2. Theoretical matching
The matching element values given below are valid theoretically. The values of the matching
elements are calculated from the input and output terminating impedance.
The termination impedances of the filter are:
input impedance:
80 Ω || 4 pF
output impedance:
80 Ω || 4 pF
L1
L2
6
2
SAW
L3
L4
1, 3, 4, 5, 7, 8
L1 = 3,0 nH
L2 = - 2,0 nH
L3 = 3,0 nH
L4 = - 2,0 nH
3. Matching on PCB ( tfs3x3b ): 1575 MHz
50 Ω test circuit:
L1
L2
6
2
L3
SAW
L4
2, 3, 4, 6, 7,8
L1 = 6,8 nH
L2 = 5,6 nH
L3 = 6,8 nH
L4 = 5,6 nH
If the parasitics on the customer board (mentioned parasitics, additional parasitics of active
parts) are different to this PCB the matching elements have to be slightly adjusted.
In case of questions please contact us to
TELEFILTER GmbH
Potsdamer Straße18
D 14 513 TELTOW / Germany
Tel: [phone] / Fax: [phone]
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.