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| Pcb: tft030 version 1.0 05.10.01 VI TELEFILTER Application Note TFS 248C - 1/2 1. General The filter is matched to 50 single ended at the input and to a 200 to 50 balun at the output. 2. Theoretical matching The matching element values given below are valid theoretically. The matching elements have to be optimised regarding the circuit and PCB design and existing parasitics. The termination impedances of the filter are: source impedance: 63 || - 1,7 pF load impedance: 63 || - 1,7 pF The values of the matching elements which are given below are calculated from the source and load impedance. If the values of the matching elements are not equal to standard values the best standard values are given in brackets. 50 test circuit LB-OUT 200Ohm : 50 Ohm C1 1 Input 6 L2 SAW L1 C2 7 L3 2,3,4,5,8,9,10 L1 = 60 nH C1 = 25 pF L2 = L3 = 30 nH C2 = 4,7 pF VI TELEFILTER Potsdamer Strae 18 D 14 513 TELTOW / Germany Tel: (+49) 3328 4784-0 / Fax: (+49) 3328 4784-30 E-Mail: tft@telefilter.com Vectron International, Inc. 267 Lowell Road Hudson, NH 03051 / USA Tel: (603) 598-0070 Fax: (603) 598-0075 E-Mail: vti@vtinh.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. Pcb: tft030 version 1.0 05.10.01 VI TELEFILTER Application Note TFS 248C - 2/2 3. PCB matching The following matching elements have been used on the PCB: C1 1 Input 6 L2 LB-OUT SAW L1 C2 7 2,3,4,5,8,9,10 L1 = 68 nH C1 = 27 pF L2 = 6,8 nH C2 = 10 pF The matching on the PCB does slightly differ from the theoretical matching. The reason for that are parasitics of the PCB. If the parasitics on the customer PCB are different the matching elements have to be slightly adjusted. VI TELEFILTER Potsdamer Strae 18 D 14 513 TELTOW / Germany Tel: (+49) 3328 4784-0 / Fax: (+49) 3328 4784-30 E-Mail: tft@telefilter.com Vectron International, Inc. 267 Lowell Road Hudson, NH 03051 / USA Tel: (603) 598-0070 Fax: (603) 598-0075 E-Mail: vti@vtinh.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. |
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