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AD9122 Arkusz danych(PDF) 6 Page - Analog Devices |
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AD9122 Arkusz danych(HTML) 6 Page - Analog Devices |
6 / 8 page CN-0243 Circuit Note Rev. 0 | Page 6 of 8 SPECTRUM ANALYZER REFERENCE GENERATOR 1961MHz RF OUTPUT (LO = 1940MHz) Figure 10. Spectrum Analyzer Noise Floor, Reference Phase Noise, and RF Output Phase Noise COMMON VARIATIONS As described in the last section, PLL performance can be adjusted by varying the bandwidth of the loop filters. There is a trade-off between loop filter bandwidth and frequency settling time that must be taken into account. If a DAC such as the AD9122 is used, the DAC NCO can also be used for fine frequency hopping, although there is a limit to the hopping speed since the NCO requires programming via an SPI port. Newer clock synthesis and distribution devices such as the AD9520 and AD9523 may provide improvements in phase noise. CIRCUIT EVALUATION AND TEST The EVAL-CN0243-EB1Z evaluation board requires the following equipment and software for signal generation and basic measurement: Equipment Needed • 5 V power supply • Low phase noise reference source (10 MHz to 200 MHz range @ +3 dBm), Rohde & Schwarz SMA100, low noise option, or equivalent • DPG2 Digital Pattern Generator from Analog Devices • High dynamic range spectrum analyzer, Agilent E4440A or equivalent • Analog Devices EVAL-ADF4XXXZ USB Adapter Software • DPG2 Software (included with DPG) • ADRF6702 software available at www.analog.com/ADRF6702 Figure 11. EVAL-CN0243-EB1Z Evaluation Board Figure 12. Bench Test Setup Setup and Test The following steps are required to properly run the EVAL-CN0243-EB1Z evaluation board: 1. Before powering up, connect all instruments, USB adapters, and cables, as shown in Figure 13. 2. There is only a single 5 V power supply required. This should be connected to the female banana plugs on the EVAL-CN0243-EB1Z board. Make sure this supply is connected, then turn on the +5 V supply. The total current at this point should be 850 mA to 900 mA. 3. The DPG2 software contains a GUI to program the AD9122. Program the AD9122 for the correct interpolations rate and NCO (if desired). 4. Turn on the DPG2 software itself. If all cables and software are working correctly, the software should recognize the DAC input data rate and display it in the lower right hand corner of the DPG GUI. Note that this |
Podobny numer części - AD9122 |
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Podobny opis - AD9122 |
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