ltp:tft050 version 1.1 10.03.2005 vi telefilter application note tfs 170n 1/2 tele filter gmbh potsdamer stra?e 18 d 14 513 teltow / germany tel: (+49) 3328 4784-0 / fax: (+49) 3328 4784-30 e-mail: tft@telefilter.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. general the filter is single ended dr iven. it is matched to 50 the matching element values given below are valid theoretically. the matching elements have to be optimised regarding the circui t and pcb design and existing parasites. theoretical matching the measured terminating impedances of the filter are: input: 780 || -7,9 pf output: 760 || -7,9 pf the values of the matching elements which are given below are calculated from the input and output impedance. l1 = 129 nh l2 = 130 nh c1 = 26 pf c2 = 27 pf c1 l1 l2 c2 10 5 1, 2, 3, 4, 6, 7, 8, 9
ltp:tft050 version 1.1 10.03.2005 vi telefilter application note tfs 170n 2/2 tele filter gmbh potsdamer stra?e 18 d 14 513 teltow / germany tel: (+49) 3328 4784-0 / fax: (+49) 3328 4784-30 e-mail: tft@telefilter.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. matching on pcb l1 = 82 nh + 4,7 nh l2 = 82 nh +8,2 nh c1 = 39 pf c2 = 39 pf all other components are 0 jumper. the matching on the pcb does slightly differ from the theoretical matching. the reasons for that are parasites on pcb. if the parasites on the customer board (mention ed parasites, additional parasites of active parts) are different to this pcb the matching elements have to be slightly adjusted. in case of questions please contact us to c1 l1 l2 c2 10 5 1, 2, 3, 4, 6, 7, 8, 9
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