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EVM Test Procedure

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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-

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

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

. 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

+ f

1

= 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

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Copyright

©

2011, Texas Instruments Incorporated

           

Summary of Contents for TRF3705

Page 1: ...he RF power amplifier Contents 1 Introduction 2 1 1 System Block Diagram 2 1 2 EVM Jumper Configuration 2 2 TRF3705 EVM Test Configuration 3 2 1 Test Block Diagram 3 2 2 Test Equipment 3 2 3 Calibrati...

Page 2: ...m 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 Jumper De...

Page 3: ...quivalent 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...

Page 4: ...re 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...

Page 5: ...m 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 equati...

Page 6: ...duct This notice contains important safety information about temperatures and voltages For additional information on TI s environmental and or safety programs please contact the TI application enginee...

Page 7: ...ncy energy and has not been tested for compliance with the limits of computing devices pursuant to part 15 of FCC or ICES 003 rules which are designed to provide reasonable protection against radio fr...

Page 8: ...na type and its gain should be so chosen that the equivalent isotropically radiated power e i r p is not more than that necessary for successful communication This radio transmitter has been approved...

Page 9: ...roduct only after you obtained the license of Test Radio Station as provided in Radio Law of Japan with respect to this product or 3 Use of this product only after you obtained the Technical Regulatio...

Page 10: ...property damage personal injury or death If there are questions concerning these ratings please contact a TI field representative prior to connecting interface electronics including input power and in...

Page 11: ...egulatory and safety related requirements concerning its products and any use of TI components in its applications notwithstanding any applications related information or support that may be provided...

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