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130 Chapter 9
W-CDMA Measurement Application
Amplitude
Description Specifications Supplemental Information
QPSK EVM
−25 dBm ≤ ML
a
≤ −15 dBm
20 to 30 °C
a. ML (mixer level) is RF input power minus attenuation.
RF input power and attenuation are set to
meet the Mixer Level range.
EVM
Range 0 to 25%
Floor 1.6%
Accuracy
b
b. The accuracy specification applies when the EVM to be measured is well above the measurement floor.
When the EVM does not greatly exceed the floor, the errors due to the floor add to the accuracy errors.
The errors due to the floor are noise-like and add incoherently with the UUT EVM. The errors depend
on the EVM of the UUT and the floor as follows: error = sqrt(EVMUUT
2
+ EVMsa
2
) − EVMUUT,
where EVMUUT is the EVM of the UUT in percent, and EVMsa is the EVM floor of the analyzer in
percent.
±1.0%
I/Q origin offset
DUT Maximum Offset −10 dBc (nominal)
Analyzer Noise Floor −50 dBc (nominal)
Frequency error
Range
±30 kHz (nominal)
c
c. This specifies a synchronization range with CPICH for CPICH only signal.
Accuracy
±5 Hz + tfa
d
d. tfa = transmitter frequency × frequency reference accuracy