User's Guide SLWU084 – June 2013 TRF37T05EVM Evaluation Module This user's guide provides instructions for evaluating the TRF37T05 modulator with a TRF37T05EVM evaluation module. The TRF37T05 is a quadrature modulator for up-converting the in-phase (I) and quadrature-phase (Q) signals to RF signals in the transmit chain, typically used between the digital-toanalog converter and the RF power amplifier. 1 2 3 Contents Introduction .................................................................................................................. 1.1 System Block Diagram ............................................................................................ 1.2 EVM Jumper Configuration ....................................................................................... TRF37T05 EVM Test Configuration ...................................................................................... 2.1 Test Block Diagram ................................................................................................ 2.2 Test Equipment ..................................................................................................... 2.3 Calibration ........................................................................................................... EVM Test Procedure ....................................................................................................... 3.1 Single-Tone Output Power Test ................................................................................. 3.2 Two-Tone OIP3 Test .............................................................................................. 2 2 2 3 3 3 3 4 4 5 List of Figures 1 2 3 ....................................................................................... Test Setup Block Diagram ................................................................................................. Two-Tone OIP3 Output Spectrum ........................................................................................ TRF37T05 System Block Diagram 2 3 5 List of Tables 1 Default Jumper Connections .............................................................................................. 2 SLWU084 – June 2013 Submit Documentation Feedback TRF37T05EVM Evaluation Module Copyright © 2013, Texas Instruments Incorporated 1 Introduction www.ti.com 1 Introduction 1.1 System Block Diagram The basic radio system block diagram in Figure 1 shows where the TRF37T05 fits in the transmitter. TRF376x CDCE62005 TCXO LO DAC34H84 TRF37T05 Figure 1. TRF37T05 System Block Diagram 1.2 EVM Jumper Configuration Table 1 lists the locations of the installed jumpers in the default configuration of the evaluation module (EVM). Table 1. Default Jumper Connections 2 Jumper Description Default JP1 Power Down Pins 2-3 Powered On JP2 Gain Control Pins 2-3 Low Gain Mode TRF37T05EVM Evaluation Module Notes SLWU084 – June 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated TRF37T05 EVM Test Configuration www.ti.com 2 TRF37T05 EVM Test Configuration 2.1 Test Block Diagram Figure 2 shows the test setup for general testing of the TRF37T05. Power Supply VCC_MOD I+ I- E4438C LO Q+ Q- VCC_LO J4 J3 J1 TRF37T05 J7 Spectrum Analyzer J6 J5 Figure 2. Test Setup Block Diagram 2.2 Test Equipment The following equipment is required for completing RF Testing: • Power supply with current readout — Agilent E3631 or equivalent • Signal generator for LO input signal — Agilent E4438C or equivalent • Arbitrary waveform generator — Agilent E4438C or equivalent • Spectrum analyzer — Agilent E4440A or equivalent 2.3 Calibration The RF cables must be good quality RF cables due to the high-frequency signals. • Measure the insertion loss of the RF output cable, and use this value to compensate for the measured output power. • Measure the insertion loss of the LO input cable, and use this value to compensate for the desired LO power. SLWU084 – June 2013 Submit Documentation Feedback TRF37T05EVM Evaluation Module Copyright © 2013, Texas Instruments Incorporated 3 EVM Test Procedure www.ti.com 3 EVM Test Procedure 3.1 Single-Tone Output Power Test 1. Connect power supplies: • Set VCC supply to 3.3 V and set the current limit to 500 mA. • Connect the VCC 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 fLO = 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 f1, 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 TRF37T05 output power at fLO + f1 = 1005.5 MHz. The RF power must be 3.5 dBm ± 1 dBm after the RF cable loss is compensated. 4 TRF37T05EVM Evaluation Module SLWU084 – June 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated EVM Test Procedure www.ti.com 3.2 Two-Tone OIP3 Test The output third-order intercept point (OIP3) is a measure of the linearity performance of a nonlinear device. It is measured by a two-tone test. The following exercise measures OIP3 following all listed steps in Section 3.1. 1. Press Mode → More (1 of 2) → Multitone. 2. Highlight row 11 for frequency offset = 4.5 MHz, press Toggle State, and then press Apply Multitone to turn on a 4.5-MHz tone. Now, two tones with equal amplitude and frequencies, f1 = 4.5 and f2 = 5.5 MHz, are configured for E4438C. 3. Measure the RF power of both RF tones, P0, which must be between –1.8 dBm to –2.8 dBm. 4. Measure the power, PIM3, of the third-order intermodulation product associated with each RF tone. It is approximately –66.5 dBm after the cable loss compensation. 5. OIP3 can be calculated by the equation OIP3 = P0 + (P0 – PIM3)/2. The worst OIP3 associated with either the low- or the high-frequency tone is selected as the OIP3 of the modulator. The OIP3 at 1 GHz is approximately –29.8 dBm ± 1 dBm. Caution must be taken for accurately measuring the small PIM3 when the large P0 is present. It is helpful to reduce the span and RBW settings of the spectrum analyzer so that the IM3 component is at least 20 dB above the noise floor, as well as by increasing the RF attenuator setting until PIM3 is no longer varying with increased RF attenuation setting. P0_low P0_high PIM2 fLO-f2 fLO-f1 PIM3_low fLO fLO+(f2-f1) PIM3_low fLO+f1 fLO+f2 Figure 3. Two-Tone OIP3 Output Spectrum SLWU084 – June 2013 Submit Documentation Feedback TRF37T05EVM Evaluation Module Copyright © 2013, Texas Instruments Incorporated 5 EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. 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