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STW81101AT 数据表(PDF) 36 Page - STMicroelectronics |
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STW81101AT 数据表(HTML) 36 Page - STMicroelectronics |
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36 / 42 page  Application information STW81101 36/42 7.2 Divided by 2 Output If the user's application does not require a balanced to unbalanced conversion, the output matching reduces to the simple circuit shown below (Figure 27). This solution can be easily used to provide one single ended output just terminating the other output at 50 Ω with a 3dB power loss. Figure 27. Differential/single ended output network in the 1.65 - 2.2GHz range (MATCH_LC_LUMP_2G_DIFF.dsn) A first solution to combine the differential outputs is the lumped LC type balun tuned in the 2GHz band (Figure 28). Figure 28. LC lumped balun for divided by 2 output (MATCH_LC_LUMP_2G.dsn) The same recommendation for the SMD components applies also for the divided by 2 output. Another topology suitable to combine the two outputs for the divided by 2 frequencies is represented in Figure 29. RFOUTP RFOUTN VCC 22nH 50 Ohm 10pF 22nH 10pF VCC 50 Ohm 50 Ohm 50 Ohm RFOUTP RFOUTN VCC 3nH 3nH 5.5nH 5.5nH 1pF 1pF 1nH 2.8pF 50 Ohm 2nH |
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