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AD9518-2 датащи(PDF) 17 Page - Analog Devices |
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AD9518-2 датащи(HTML) 17 Page - Analog Devices |
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17 / 64 page ![]() Data Sheet AD9518-2 Rev. C | Page 17 of 64 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 2.0 2.4 2.3 2.2 2.1 FREQUENCY (GHz) Figure 11. VCO Tuning Voltage vs. Frequency (Note that VCO calibration centers the dc tuning voltage for the PLL setup that is active during calibration.) –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 10 0 CENTER 122.88MHz SPAN 50MHz 5MHz/DIV Figure 12. PFD/CP Spurs; 122.88 MHz; PFD = 15.36 MHz; LBW = 138 kHz; ICP = 3.0 mA; fVCO = 2.21 GHz –110 –100 –90 –80 –70 –60 –50 –40 –30 –20 –10 10 0 CENTER 122.88MHz SPAN 1MHz 100kHz/DIV Figure 13. Output Spectrum, LVPECL; 122.88 MHz; PFD = 15.36 MHz; LBW = 138 kHz; ICP = 3.0 mA; fVCO = 2.21 GHz 1.0 0.6 0.2 –0.2 –0.6 –1.0 0 25 20 15 10 5 TIME (ns) Figure 14. LVPECL Output (Differential) at 100 MHz 1.0 0.6 0.2 –0.2 –0.6 –1.0 0 2 1 TIME (ns) Figure 15. LVPECL Output (Differential) at 1600 MHz 1600 800 1000 1200 1400 0 3 2 1 FREQUENCY (GHz) Figure 16. LVPECL Differential Swing vs. Frequency, Using a Differential Probe Across the Output Pair |
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