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TH71221 データシート(PDF) 39 Page - Melexis Microelectronic Systems |
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TH71221 データシート(HTML) 39 Page - Melexis Microelectronic Systems |
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39 / 44 page  TH71221 27 to 930MHz FSK/FM/ASK Transceiver 39010 071221 Page 39 of 44 Data Sheet Rev. 005 June/07 9 TX/RX Combining Network 9.1 Board Component List (Fig. 19) Part Size Value @ 315 MHz Value @ 433.92 MHz Value @ 868.3 MHz Value @ 915 MHz CRX0 0603 100 pF 100 pF 100 pF 100 pF CTX0 0603 6.8 pF 6.8 pF 6.8 pF 6.8 pF CTX1 0603 10 pF 6.8 pF 4.7 pF 3.9 pF CTX2 0603 10 pF 6.8 pF 4.7 pF 3.9 pF CTX4 0603 12 pF 5.6 pF 3.3 pF 3.3 pF LRX2 0603 82 nH 56 nH 10 nH 6.8 nH LTX0 0603 15 nH 15 nH 4.7 pF 3.9 nH LTX1 0603 33 nH 33 nH 8.2 nH 8.2 nH CB2 0603 330 pF 330 pF 330 pF 330 pF " No TX/RX switch required " Direct connection to λ/4 antenna possible Fig. 19: Combining network schematic 9.2 Typical LNA S-Parameters in Receive Mode Low Gain Mode Frequency Re[S11] Im[S11] Re[S12] Im[S12] Re[S21] Im[S21] Re[S22] Im[S22] 27 MHZ 0.9138 -0.0145 6.06E-005 4.27E-004 -0.4172 0.0334 0.9986 -0.0095 40 MHz 0.9139 -0.0229 5.53E-005 6.73E-004 -0.4092 0.0400 0.9984 -0.0136 80 MHz 0.9126 -0.0481 5.36E-005 1.48E-004 -0.3989 0.0581 0.9979 -0.0265 170 MHz 0.9054 -0.1026 7.44E-004 3.25E-003 -0.3828 0.1056 0.9966 -0.0558 315 MHz 0.8836 -0.1814 2.16E-004 6.21-E003 -0.3300 0.1798 0.9926 -0.1033 433 MHz 0.8622 -0.2625 7.81E-004 6.34E-003 -0.3248 0.2168 0.9870 -0.1417 868 MHz 0.7161 -0.4577 2.35E-003 1.09E-003 -0.1265 0.3187 0.9543 -0.2829 915 MHz 0.6975 -0.4753 2.24E-003 1.10E-003 -0.1062 0.3206 0.9494 -0.2980 Note: input and output of the LNA are connected to 50 Ω ports without matching elements High Gain Mode Frequency Re[S11] Im[S11] Re[S12] Im[S12] Re[S21] Im[S21] Re[S22] Im[S22] 27 MHZ 0.8417 -0.0151 1.36E-004 8.63E-005 -4.0840 0.1272 0.9994 -0.0092 40 MHz 0.8424 -0.0276 1.42E-004 1.07E-004 -4.0840 0.2055 0.9994 -0.0135 80 MHz 0.8403 -0.0621 1.52E-004 1.83E-004 -4.0630 0.4338 0.9991 -0.0269 170 MHz 0.8273 -0.1344 1.86E-004 3.72E-003 -3.9550 0.9279 0.9977 -0.0571 315 MHz 0.7884 -0.2328 4.02E-004 7.04E-003 -3.5100 1.6990 0.9846 -0.1072 433 MHz 0.7492 -0.3405 1.51E-004 6.18E-003 -3.4700 1.9920 0.9839 -0.1439 868 MHz 0.5007 -0.5322 2.36E-004 1.06E-003 -1.6710 3.2230 0.9501 -0.2847 915 MHz 0.4714 -0.5440 1.94E-004 1.06E-003 -1.4690 3.2700 0.9451 -0.2995 Note: input and output of the LNA are connected to 50 Ω ports without matching elements LTX0 CTX0 CB2 CTX4 LRX2 CRX0 LTX1 CTX1 RF input RF output CTX2 50 Ω OUT_PA IN_LNA 26 25 VCC |
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