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ADP150 Fiches technique(PDF) 4 Page - Analog Devices |
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ADP150 Fiches technique(HTML) 4 Page - Analog Devices |
4 / 5 page CN-0285 Circuit Note Rev. 0 | Page 4 of 5 Table 3. Single-Carrier W-CDMA Composite EVM Results Comparing Filter vs. No Filter on ADF4351 RF Outputs (Measured As Per 3GPP Specification Test Model 4) Frequency (MHz) ADF4350 Composite EVM No LO Filtering ADF4350 Composite EVM with LO Filtering, Filter B ADF4351 Composite EVM with LO Filtering, Filter B 2140 3.27% 1.31% 1.02% 1800 1.46% 1.13% 0.95% 900 10.01% 1.03% 0.96% Figure 6. EVM Measurement Setup (Simplified Diagram) In addition to the improvement in sideband suppression and EVM, there is also a performance benefit to driving the ADL5375 LO inputs differentially. This benefit improves modulator output IP2 performance by 2 dB to 5 dB, compared with single-ended LO drive. Note that most external VCOs only come with a single- ended output, so using the differential outputs on the ADF4351 provides a benefit over an external VCO in this case. Figure 7 shows sideband suppression results using an 850 MHz to 2450 MHz filter (Filter Type B). Figure 7. Sideband Suppression Results for 850 MHz to 2450 MHz Filter Type B A complete design support package for this circuit note can be found at http://www.analog.com/CN0285-DesignSupport. COMMON VARIATIONS It is possible to use the auxiliary outputs on the ADF4351 to switch between two filter types where wideband operation beyond that possible with one single filter is required (see Figure 8). An RF double-pole, 4-throw switch (DP4T) is used to select the differential outputs of either Filter 1 or Filter 2. Figure 8. Application Diagram Showing Possibility of Filter Switching Using the ADF4351 Main and Auxiliary Outputs CIRCUIT EVALUATION AND TEST The EVAL-CN0285-EB1Z evaluation board contains the circuit described in CN-0285, allowing for the quick setup and evaluation of the performance of the circuit. The control software for the EVAL-CN0285-EB1Z uses the standard ADF4351 programming software located on the CD that accompanies the evaluation board. Equipment Needed The following equipment is needed: • A standard PC running Windows® XP, Windows Vista (32- bit), or Windows 7 with a USB port • The EVAL-CN0285-EB1Z circuit evaluation board • The ADF435x programming software • 5.5 V power supplies • An I-Q signal source, such as the Rohde & Schwarz AMIQ • A spectrum analyzer, such as the Rohde & Schwarz FSQ8 For additional details, see the UG-521 User Guide, the ADF4351 data sheet, and the ADL5375 data sheet. R&S AMIQ GEN. I+ I– Q+ Q– SPECTRUM ANALYZER [R&S FSQ 8] POWER SUPPLY CN-0285 EVALUATION BOARD 5.5V RF OUT –90 –80 –70 –60 –50 –40 –30 –20 800 1000 1200 1400 1600 1800 2000 2200 2400 CARRIER FREQUENCY (MHz) –4dBm –1dBm +2dBm +5dBm ADF4351 12 RFOUTA+ 13 RFOUTA– 14 RFOUTB+ 15 RFOUTB– ADL5375 3 LOIP 4 LOIN 1nF 1nF FILTER 1 DP4T SWITCH FILTER 2 |
Numéro de pièce similaire - ADP150 |
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Description similaire - ADP150 |
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