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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ADRF6821 датащи(PDF) 17 Page - Analog Devices |
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ADRF6821 датащи(HTML) 17 Page - Analog Devices |
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17 / 61 page  Data Sheet ADRF6821 Rev. A | Page 17 of 61 PHASE-LOCKED LOOP (PLL) PERFORMANCE All supply pins = 3.3 V, TA = 25°C, fPFD = 30.72 MHz, fREF = 122.88 MHz, 20 kHz loop filter, measured at LO output, unless otherwise noted. 0 –10 –110 –90 –80 –40 –140 –60 –160 –70 –30 –130 –50 –150 –20 –120 –170 –100 0.001 0.01 1 0.1 10 100 OFFSET FREQUENCY (MHz) +105°C +27°C –40°C Figure 31. Open-Loop VCO Phase Noise vs. Offset Frequency for Various Temperatures 0 –10 –110 –90 –80 –40 –140 –60 –160 –70 –30 –130 –50 –150 –20 –120 –170 –100 0.001 0.01 1 0.1 10 100 OFFSET FREQUENCY (MHz) VCO = 4GHz VCO = 4.7GHz VCO = 5.6GHz VCO = 6.8GHz Figure 32. Open-Loop VCO Phase Noise vs. Offset Frequency for Various VCO Frequencies –60 –110 –90 –80 –140 –160 –70 –130 –150 –120 –170 –100 0.001 0.01 1 0.1 10 100 OFFSET FREQUENCY (MHz) Figure 33. Closed-Loop Phase Noise vs. Offset Frequency for fLO = 1765 MHz –60 –110 –90 –80 –140 –160 –70 –130 –150 –120 –170 –100 0.001 0.01 1 0.1 10 100 OFFSET FREQUENCY (MHz) Figure 34. Closed-Loop Phase Noise vs. Offset Frequency for fLO = 2350 MHz –60 –110 –90 –80 –140 –160 –70 –130 –150 –120 –170 –100 0.001 0.01 1 0.1 10 100 OFFSET FREQUENCY (MHz) Figure 35. Closed-Loop Phase Noise vs. Offset Frequency for fLO = 2720 MHz –170 –250 –240 –200 –220 –230 –190 –210 –180 –270 –260 450 920 1860 1390 2330 2800 LO FREQUENCY (MHz) +105°C +27°C –40°C FRACTIONAL FLICKER Figure 36. PLL Figure of Merit (FOM) vs. LO Frequency |
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