AN369: Si4010 Antenna Interface and Matching Network ... - wless.ru

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AN369Figure 22. Si4010 MSOP Matching Network for 868 MHzFigure 23. Top Layout of the SI Testcard with MSOP Packaged Si4010The measured spectrum by a 50 spectrum analyzer up to 3.6 GHz is shown in Figure 24. The realized matchinghas ETSI compliance in this conductive measurement. Assuming 0 dB gain antenna the compliance reserved inradiated measurements as well.The fundamental power is ~+8.9 dBm. Assuming 0.8 dB loss for the balun and 0.15 dB loss for the filter, the powerdelivered to the differential port of the balun is ~+9.85 dBm. That is, the power goes into a properly designeddifferential antenna input without external matching elements.22 Rev. 0.1
AN3694.2. High Q Discrete Matching BalunsFigure 24. Measured Spectrum Up to 3.6 GHzThis section is useful for readers who intend to understand the fundamental operation of the high Q discretematching baluns.The designed baluns shows nearly the optimum impedances listed in Table 1 and Table 2 on page 3 for the Si4010outputs if the single-ended port is terminated by 50 .As mentioned previously, the two main tasks the matching balun performs with minimal insertion loss are:• Shows the optimum termination impedance (see Section “2. High Impedance Differential Power Amplifier” ) tothe differential output of the chip if the single-ended port of the balun is terminated by 50 .• Makes the balun function, i.e., adds the two differential outputs in-phase, with equal magnitudes.Also it should suppress the even harmonics, and it has an additional function to trap and remove the 2nd harmonic.The first two functions can be satisfied with optimum solution in narrowband only. This section shows the designhints of narrowband discrete baluns.4.2.1. Design ProcedureThe basic structure which theoretically satisfies the two main matching balun function has four external elementsas shown in Figure 25. C_TX in the figure is the same equivalent capacitance which is denoted by C TX in Figure 1on page 2.Rev. 0.1 23
Page 1 and 2: AN369Si4010 ANTENNA I NTERFACE AND
Page 3 and 4: AN369A second important operation m
Page 5 and 6: AN369Figure 4. 4010-DAPB434 Schemat
Page 7 and 8: AN369Figure 5. Si4010-DAPB434 Key F
Page 9 and 10: AN369Figure 8. Antenna Simulation (
Page 11 and 12: AN369enough to accurately estimate
Page 13 and 14: AN369Simulated impedance:The simula
Page 15 and 16: AN3694.1. Matching Baluns for Si401
Page 17 and 18: AN3694.1.2. 868MHz SOIC Matching Ba
Page 19 and 20: AN3694.1.3. 434 MHz MSOP Matching B
Page 21: AN369Figure 21. Measured Spectrum U
Page 25 and 26: AN3691. Calculate the values e.g. f
Page 27 and 28: AN3694.00180.0PHASE3.0090.002.000.0

AN369: Si4010 Antenna Interface and Matching Network ... - wless.ru

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