
Ltp: ---
______________________________________________________________________________________________________
VI TELEFILTER
Application Note
______________________________________________________________________________________________________
1. General
The filter is designed for single ended use at the input and at the output.It is matched
to 50
.
The terminating impedances are
Input :
30
|| -21,2 pF
Output:
35
|| -21,6 pF
The matching element values given below are calculated from the terminating
impedances. If the values of the matching elements are not equal to standard values
the best standard values are given in brackets. Because these are theoretical values
they have to be modified on PCB’s corresponding to the existing parasitics.
2. Theoretical matching to 50
single ended
C1
10
version 1.0
07.07.2000
TFS 285 - 1/1
VI TELEFILTER
Potsdamer Strae 18
D 14 513 TELTOW / Germany
Tel: (+49) 3328 4784-52 / Fax: (+49) 3328 4784-30
E-Mail: tft@telefilter.com
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.
Vectron International, Inc.
267 Lowell Road
Hudson, NH 03051 / USA
Tel: (603) 598-0070 Fax: (603) 598-0075
E-Mail: vti@vtinh.com
C2
Output
50 Ohm
L2
Input
50 Ohm
L1
SAW
1,2,3,5,6
4
7,8,9,10,11
The theoretical values of the stated elements are:
L1 = 17 nH (18nH)
C1 = 82pF
L2 = 17 nH (18 nH)
C2 = 100 pF