Ltp: --10/27/2008 version 1.0 ______________________________________________________________________________________________________ VI TELEFILTER Application Note TFS 199D - 1/1 ______________________________________________________________________________________________________ 1. General The filter is designed single ended use at the input and at the output. The terminating impedances are input: 740 Ω || -7.9pF single ended output: 880 Ω || -6.2pF single ended 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 Ω The theoretical values of the stated elements are: L1 = 150 n L3 = 165 nH (180 nH) L2 = 164 nH (150 nH) L4 = 250 nH (220 nH) L1 L3 10 Input 50 Ohm 5 Output SAW L4 L2 50 Ohm 6 1 2,3,4,7,8,9 3.Matching on the PCB L1= 150nH L2= 100nH L3=180nH L4=100nH VI TELEFILTER Potsdamer Straße 18 D 14 513 TELTOW / Germany Tel: (+49) 3328 4784-52 / Fax: (+49) 3328 4784-30 E-Mail: [email protected] Vectron International, Inc. 267 Lowell Road Hudson, NH 03051 / USA Tel: (603) 598-0070 Fax: (603) 598-0075 E-Mail: [email protected] 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.