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LTC5586 Folha de dados(PDF) 21 Page - Linear Technology |
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LTC5586 Folha de dados(HTML) 21 Page - Linear Technology |
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21 / 34 page ![]() LTC5586 21 5586fa For more information www.linear.com/LTC5586 applicaTions inForMaTion single-ended LO input, it is necessary to terminate the unused LO input (LOP in Figure 7) into 50Ω. The programmable input match adjust is controlled by the BAND, CF1, LF1, and CF2 registers as detailed in the register map shown in Table 3. The return loss for the register setting in Table 3 is shown in Figure 8. Table 3. Register Settings for Single-Ended LO Matching LO FREQUENCY (MHz) BAND CF1 LF1 CF2 300 - 339 0 31 3 31 339 - 398 0 21 3 24 398 - 419 0 14 3 23 419 - 556 0 17 2 31 556 - 625 0 10 2 23 625 - 801 0 15 1 31 801 - 831 0 14 1 27 831 - 1046 0 8 1 21 1046 - 1242 1 31 3 31 1242 - 1411 1 21 3 28 1411 - 1696 1 17 2 26 1696 - 2070 1 15 1 31 Default 1 8 3 3 2070 - 2470 1 8 1 21 2470 - 2980 1 2 1 10 2980 - 3500 1 1 0 19 3500 - 6000 1 0 0 0 Figure 8. Single-Ended LO Input Return Loss vs BAND, CF1, LF1, and CF2 0 1 2 3 4 5 6 7 8 5 0 –5 –10 –15 –20 –25 –30 –35 LO FREQUENCY (GHz) 0, 31, 3, 31 0, 17, 2, 31 0, 14, 1, 27 1, 21, 3, 28 1, 15, 1, 31 1, 2, 1, 10 1, 1, 0, 19 1, 0, 0, 0 TC = 25°C 5586 F08 LTC5586 5586 F09 C5 0.3pF C6 1000pF C7 0.3pF C8 1000pF LO MATCH ADJUST 0º 90º GND LOM LO INPUT (MATCHED) LOP ANAREN B4859A53 VCC Figure 9. Simplified Schematic of the LO Inputs Using a Balun for Differential Drive Figure 10. OIP2 vs Single-Ended and Differential LO Input 0 1 2 3 4 5 6 100 90 80 70 60 50 40 30 20 10 0 RF FREQUENCY (GHz) I, SINGLE-ENDED Q, SINGLE-ENDED I, DIFFERENTIAL Q, DIFFERENTIAL 5586 F10 TC = 25°C The LO inputs can also be driven differentially. Figure 10 compares the uncalibrated OIP2 performance of single ended versus differential LO drive using the ANAREN B4859A53 balun as shown in the schematic of Figure 9. |
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