ltp: --- version 1.0 09.02.2001 ______________________________________________________________________________________________________ vi telefilter application note tfs 433k 1/1 ______________________________________________________________________________________________________ vi telefilter vectron international, inc. potsdamer stra?e 18 267 lowell road d 14 513 teltow / germany hudson, nh 03051 / usa tel: (+49) 3328 4784-52 / fax: (+49) 3328 4784-30 tel: (603) 598-0070 fax: (603) 598-0075 e-mail: tft@telefilter.com e-mail: vti@vtinh.com vi telefilter rese rves the right to make changes to the product(s) and/or information contained herein without notice. no liab ility is assumed as a result of their use or application. no rights under any patent accompany the sale of any such product(s) or infor mation. 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 : 370 || -0,9 pf output: 370 || -0,9 pf 2. theoretical matching to 50 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. l2 output 50 ohm c2 input 50 ohm c1 l1 saw l1 = 47 nh l2 = 47 nh c1 = 1,5 pf c2 = 1,5 pf
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