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| Ltp: tft029 version 1.2 04.06.03 VI TELEFILTER Application Note TFS 210G 1/2 1. General The filter is single ended driven. It is matched to 50 . The matching element values given below are valid on the test PCB. If the parasitics on the customer PCB and on this PCB are different, the matching elements have to be optimised regarding the circuit and PCB design. The matching elements have been chosen from the E12- series (European standard series with fixed tolerances). 2. Theoretical matching The termination impedances of the filter are: source impedance: 860 || - 6,4 pF load impedance: 1160 || - 6,7 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 L1 1 Input 50 Ohm C1 6 L2 Output 50 Ohm C2 SAW 2,3,4,5,7,8,9,10 L1 = 100,8 nH L2 = 96,4 nH C1 = 30 pF C2 = 33,8 pF TELEFILTER GmbH Potsdamer Strae 18 D 14 513 TELTOW / Germany Tel: (+49) 3328 4784-0 / 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. Ltp: tft029 version 1.2 04.06.03 VI TELEFILTER Application Note TFS 210G 2/2 3. Matching on the PCB For example: PCB with 50 test circuit L1 1 Input 50 Ohm C1 C3 2,3,4,5,7,8,9,10 6 L2 Output 50 Ohm SAW C2 L1 = 82 nH L2 = 56 nH C1 = 33 pF All other components are 0 jumpers. C2 = 39 pF C3 = 1,2 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 board (mentioned parasitics, additional parasitics of active parts) are different to this PCB the matching elements have to be slightly adjusted. In case of questions please contact us to TELEFILTER GmbH Potsdamer Strae 18 D 14 513 TELTOW / Germany Tel: (+49) 3328 4784-0 / 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. |
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