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AD8346ARU-REEL7 Fiches technique(PDF) 11 Page - Analog Devices |
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AD8346ARU-REEL7 Fiches technique(HTML) 11 Page - Analog Devices |
11 / 12 page REV. 0 AD8346 –11– CHARACTERIZATION SETUPS SSB Setup Two main setups were used to characterize this product. These setups are shown below in Figures 27 and 29. Figure 27 shows the setup used to evaluate the product as a Single Sideband modu- lator. The AD8346 Motherboard had circuitry that converted the single-ended I and Q inputs from the arbitrary function generator to differential inputs with a dc bias of approximately 1.2 V. In addition, the Motherboard also provided connections for power supply routing. The HP34970A and its associated plug-in 34901 were used to monitor power supply currents and voltages being supplied to the AD8346 Evaluation Board (a full schematic of the AD8346 Evaluation Board can be found in Figure 25). The 2 HP34907 plug-ins were used to provide addi- tional miscellaneous dc and control signals to the Motherboard. The LO was driven by an RF signal generator (through the balun on the evaluation board to present a differential LO signal to the device) and the output was measured with a spectrum analyzer. With the I channel driven with a sine wave and the Q channel driven with a cosine wave, the lower sideband is the single sideband output. The typical SSB output spectrum is shown below in Figure 28. CDMA Setup For evaluating the AD8346 with CDMA waveforms the setup shown in Figure 29 was used. This is essentially the same as that used for the single sideband characterization except the AFG2020 was replaced with the AWG2021 for providing the I and Q input signals, and the spectrum analyzer used to monitor the output was changed to an FSEA30 Rohde-Schwarz analyzer with vector demodulation capability. The I/Q input signals for these measurements were IS95 baseband signals generated with Tektronix I/Q SIM software and downloaded to the AWG2021. For measuring ACPR the I/Q input signals used were generated with Pilot (Walsh Code 00), Sync (WC 32), Paging (WC 01), and 6 Traffic (WC 08, 09, 10, 11, 12, 13) channels active. The I/Q SIM software was set for 32 × oversampling and was using a BS equifilter. Figure 30 shows the typical output spectrum for this configuration. The ACPR was measured 885 kHz away from the carrier frequency. For performing EVM, Rho, phase, and amplitude balance mea- surements the I/Q input signals used were generated with only the Pilot Channel (Walsh Code 00) active. The I/Q SIM soft- ware was set for 32 × oversampling and was using a CDMA equifilter. VPS1 VN GND VP AD8346 MOTHERBOARD I IN Q IN D1 D2 D3 P1 IN IP QP QN IEEE 34901 34907 34907 D1 D2 D3 HP34970A AD8346 EVAL BOARD P1 IN IP QP QN LO ENBL VOUT RFOUT IEEE HP8648C +15V MAX COM +25V MAX –25V MAX IEEE HP3631 IEEE PC CONTROLLER HP8593E RF I/P CAL OUT 28VOLT IEEE SPECTRUM ANALYZER SWEEP OUT OUTPUT 1 OUTPUT 2 IEEE TEKAFG2020 ARB FUNC. GEN Figure 27. Evaluation Board SSB Test Setup 0 CENTER 1.9GHz –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 50kHz/ SPAN 500kHz Figure 28. Typical SSB Output Spectrum VPS1 VN GND VP AD8346 MOTHERBOARD I IN Q IN D1 D2 D3 P1 IN IP QP QN IEEE 34901 34907 34907 D1 D2 D3 HP34970A AD8346 EVAL BOARD P1 IN IP QP QN LO ENBL VOUT RFOUT IEEE HP8648C +15V MAX COM +25V MAX –25V MAX IEEE HP3631 IEEE PC CONTROLLER FSEA30 RF I/P IEEE SPECTRUM ANALYZER OUTPUT 1 OUTPUT 2 IEEE TEKAFG2020 ARB FUNC. GEN Figure 29. Evaluation Board CDMA Test Setup –20 CENTER 1.9GHz –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 187.5kHz/ SPAN 1.875MHz CH PWR = –20.7dBm ACP UPR = –71.8dBc ACP LWR = –71.7dBc Figure 30. Typical CDMA Output Spectrum |
Numéro de pièce similaire - AD8346ARU-REEL7 |
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Description similaire - AD8346ARU-REEL7 |
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