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Measurement can be done with an oscilloscope and a probe.
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Connect the probe to R7531.
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WTXDET signal should be constant DC-voltage. Voltage level should change if TX power is changed.
Vcontrol is lower on lower power levels and higher if higher power levels are used.
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WTXDET should be about 325 mV with power level +10 dBm, about 1.03 V with power level
+21 dBm and about 150 mV when power levels below 0 dBm are used.
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NOTICE: Perform WCDMA transmitter tests with > 0 dBm power only in RF shielded environment.
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If WTXDET –signal is not as expected follow the same troubleshooting instructions as in:
SMPS get correct control voltage from the WCDMA power detector (signal Vcontrol)?
A-16
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Appendix A: RF Troubleshooting
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