Agilent Technologies N9010A - Manual (Page 294)

294 Chapter 33
W-CDMA Measurement Application
Measurements
Description Specifications Supplemental Information
QPSK EVM
(
−25 dBm ≤ ML a ≤ −15 dBm
20 to 30°C)
RF input power and attenuation are set to
meet the Mixer Level range.
EVM
Range 0 to 25% (nominal)
Floor 1.6%
Accuracy
b ±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
Accuracy
±5 Hz + tfa d
a. ML (mixer level) is RF input power minus attenuation.
b. The accuracy specification applies when the EVM to be measured is well above the measurement floor
and sucessfully synchronized to the signal. 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 incoher-
ently 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.
c. This specifies a synchronization range with CPICH for CPICH only signal.
d. tfa = transmitter frequency
× frequency reference accuracy