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ADF4350 데이터시트(PDF) 3 Page - Analog Devices |
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ADF4350 데이터시트(HTML) 3 Page - Analog Devices |
3 / 4 page Circuit Note CN-0144 Rev. C | Page 3 of 4 R&S AMIQ POWER SUPPLY AD5385 EVALUATION BOARD ADAPTED TO ACCEPT DIFFERENTIAL LO INPUTS ADF4350 EVALUATION BOARD SPECTRUM ANALYZER IP LOIP LOIN RFOUTA+ RFOUTA– RFOUT IN QP QN 5V Figure 3. Sideband Suppression Measurement Test Setup (Simplified Diagram) COMMON VARIATIONS The PLL-to-modulator interface described in this circuit note is applicable to all I/Q modulators that contain a 2XLO-based phase splitter. It is also applicable to 2XLO-based I/Q demodulators such as the ADL5387. CIRCUIT EVALUATION AND TEST The CN-0144 uses the EVAL-ADF4350EB1Z and the ADL5385-EVALZ boards for evaluation of the described circuit, allowing for quick setup and evaluation. The EVAL-ADF4350EB1Z board uses the standard ADF4350 programming software, contained on the CD that accompanies the evaluation board. Equipment Needed Windows® XP, Windows Vista (32-bit), or Windows 7 (32-bit) PC with USB Port, the EVAL-ADF4350EB1Z, and the ADL5385- EVALZ circuit evaluation boards, the ADF4350 programming software, power supplies, I-Q signal source, such as a Rhode & Schwarz AMIQ, and a spectrum analyzer. See the CN-0144 and the UG-109 user guide for evaluation board EVAL-ADF4350EB1Z and the ADF4350 and ADL5385 data sheets. Getting Started This circuit note contains a description of the circuit, the schematic, and a block diagram of the test setup. The user guide UG-109 details the installation and use of the EVAL-ADF4350 evaluation software. The UG-109 also contains board setup instructions and the board schematic, layout, and bill of materials. The ADL5385-EVALZ board schematic, block diagram, bill of materials, layout, and assembly information is included in the ADL5385 data sheet. See the ADF4350 and ADL5385 data sheet for device information. Functional Block Diagram The CN-0144 contains the function block diagram of the described test setup in Figure 3. Setup and Test After setting up the equipment, use standard RF test methods to measure the sideband suppression of the circuit. FURTHER IMPROVEMENTS WITH FILTERING The sideband suppression of this circuit can be further improved by filtering the LO signal before the LOIP and LOIN pins of the ADL5385. Filtering attenuates harmonic levels so as to minimize errors in the quadrature generation block of the ADL5385. At some frequencies, this can result in improvements over 10 dB. However, using a filter will limit the bandwidth of the circuit. See Figure 4 for narrowband results. –80 –70 –60 –50 –40 –30 –20 –10 0 700 800 900 1000 1100 1200 1300 RFOUT (MHz) NO FILTER WITH FILTER Figure 4. Sideband Suppression Comparison With and Without a Harmonic Filter The LO signal was passed through a low-pass filter with a 3 dB point at approximately 2600 MHz. This results in a usable output frequency up to approximately 1300 MHz. |
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