Agilent Technologies N9010A specifications Offset Freq Integ BW, 174

1xEV-DO Measurement Application

Measurements

Description		Specifications	Supplemental Information
Spectrum Emission Mask and
Adjacent Channel Power
Minimum power at RF Input			−20 dBm (nominal)
Dynamic Range, relativea
Offset Freq.	Integ BW
750 kHz	30 kHz	−73.6 dB	−81.0 dB (typical)
1980 kHz	30 kHz	−78.3 dB	−83.9 dB (typical)
Sensitivity, absolute
Offset Freq.	Integ BW
750 kHz	30 kHz	−94.7 dB	−100.7 dB (typical)
1980 kHz	30 kHz	−94.7 dB	−100.7 dB (typical)
Accuracy, relative			RBW methodb
Offset Freq.	Integ BW
750 kHz	30 kHz	±0.09 dB
1980 kHz	30 kHz	±0.10 dB

a.The dynamic range specification is the ratio of the channel power to the power in the offset specified. The dynamic range depends on the measurement settings, such as peak power or integrated power. This specification is derived from other analyzer performance limitations such as third-order intermodula- tion, DANL and phase noise. Dynamic range specifications are based on default measurement settings, with detector set to average, and depend on the mixer level. Mixer level is defined to be the input power minus the input attenuation.

b.The RBW method measures the power in the adjacent channels within the defined resolution band- width. The noise bandwidth of the RBW filter is nominally 1.055 times the 3.01 dB bandwidth. There- fore, the RBW method will nominally read 0.23 dB higher adjacent channel power than would a measurement using the integration bandwidth method, because the noise bandwidth of the integration bandwidth measurement is equal to that integration bandwidth. For 1xEVDO ACPR measurements using the RBW method, the main channel is measured in a 3 MHz RBW, which does not respond to all the power in the carrier. Therefore, the carrier power is compensated by the expected under-response of the filter to a full width signal, of 0.15 dB. But the adjacent channel power is not compensated for the noise bandwidth effect. The reason the adjacent channel is not compensated is subtle. The RBW method of measuring ACPR is very similar to the preferred method of making measurements for com- pliance with FCC requirements, the source of the specifications for the 1xEVDO Spur Close specifica- tions. ACPR is a spot measurement of Spur Close, and thus is best done with the RBW method, even though the results will disagree by 0.23 dB from the measurement made with a rectangular passband.

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