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SLWU073 データシート(PDF) 4 Page - Texas Instruments |
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SLWU073 データシート(HTML) 4 Page - Texas Instruments |
4 / 7 page EVM Test Procedure www.ti.com 3 EVM Test Procedure 3.1 Single-Tone Output Power Test 1. Connect power supplies: • Set V CC supply to 3.3 V and set the current limit to 500 mA. • Connect the V CC supply to header TP2. Connect the ground to TP1. 2. Use a suitable 50- Ω output signal generator to supply the LO signal with 0 dBm with the cable loss compensated and the desired frequency f LO = 1 GHz to J1; terminate J2 with 50 Ω to ground. 3. Use a digital-to-analog converter or an arbitrary waveform generator to provide I/Q input signals. A typical setup is as follows: a 1-Vpp sinusoidal wave in differential mode for both I and Q signals with a frequency of f 1, a dc offset of 0.25 V, and an output impedance of 50 Ω. Use an Agilent E4438C vector signal generator to provide I/Q signals in the following example. • Press Preset. • Press Mode → More (1 of 2) → Multitone. • Press Initialize Table → Number of Tones → 12 → Enter. • Press Freq Spacing → 1 → MHz. • Press Done. • Highlight each row of the first 11 rows, and press Toggle State to turn the selected tone off; keep only the last row with the BB frequency of 5.5 MHz. Now, 5.5-MHz, single-tone, BB I/Q signals are configured for E4438C. • Press Multitone Off/On until On is highlighted to generate the multitone waveform. • Connect I signals to J4 (I+) and J3 (I –), and the Q signals to J5 (Q–) and J6 (Q+). • Adjust the differential I or Q voltage level to be 1 Vpp by pressing Mode → I/Q → I/Q Output Control → I/Q Output Atten → enter 9 → Press dB. The voltage can be measured by an oscilloscope. Note that the differential voltage is twice the single-ended voltage. • Set the common-mode voltage (CMV) of E4438A to 0.25 V by pressing Mode → I/Q → I/Q Output Control → Common Mode I/Q Offset → 250 → mV. Use a dc voltage meter to monitor the dc common voltage at the inputs of I and Q, and fine-tune the CMV setting until it is measured to be 250 mV. 4. Verify that jumper connection of pin 2 and pin 3 on JP2 to set device in low gain mode 5. Verify that jumper connection of pin 2 and pin 3 at JP1 to ensure that power down is not engaged. 6. Monitor Vcc at TP1 to ensure that Vcc is 3.3 V. Verify that the current draw is about 305 mA ± 15 mA. 7. Connect a spectrum analyzer to the SMA connector marked RFOUT (J7), and measure the TRF3705 output power at f LO + f1 = 1005.5 MHz. The RF power must be 3.5 dBm ± 1 dBm after the RF cable loss is compensated. 4 TRF3705EVM Evaluation Module SLWU073 – October 2011 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated |
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同様の説明 - SLWU073 |
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