Agilent Technologies N9010A - Manual (Page 281)

Chapter 32 281
TD-SCDMA Measurement Application
Measurements
Description Specification Supplemental Information
Adjacent Channel Power
Single Carrier
Minimum Power at RF Input
−36 dBm (nominal)
ACPR Accuracy
a
RRC weighted, 1.28 MHz noise
bandwidth, method = IBW
Radio Offset Freq
MS (UE) 1.6 MHz
±0.15 dB
At ACPR range of
−30 to −36 dBc with
optimum mixer level
b
MS (UE) 3.2 MHz
±0.16 dB
At ACPR range of
−40 to −46 dBc with
optimum mixer level
c
BTS 1.6 MHz
±0.34 dB
At ACPR range of
−37 to −43 dBc with
optimum mixer level
d
BTS 3.2 MHz
±0.18 dB
At ACPR range of
−42 to −48 dBc with
optimum mixer level
e
BTS 1.6 MHz
±0.14 dB
At
−43 dBc non-coherent ACPR d
a. The accuracy of the Adjacent Channel Power Ratio will depend on the mixer drive level and whether
the distortion products from the analyzer are coherent with those in the UUT. These specifications
apply even in the worst case condition of coherent analyzer and UUT distortion products. For ACPR
levels other than those in this specifications table, the optimum mixer drive level for accuracy is
approximately
−37 dBm − (ACPR/3), where the ACPR is given in (negative) decibels.
b. To meet this specified accuracy when measuring mobile station (MS) or user equipment (UE) within 3
dB of the required
−33 dBc ACPR, the mixer level (ML) must be optimized for accuracy. This opti-
mum mixer level is
−25 dBm, so the input attenuation must be set as close as possible to the average
input power
− (−25 dBm). For example, if the average input power is −6 dBm, set the attenuation to 19
dB. This specification applies for the normal 3.5 dB peak-to-average ratio of a single code. Note that if
the mixer level is set to optimize dynamic range instead of accuracy, accuracy errors are nominally
doubled.
c. ACPR accuracy at 3.2 MHz offset is warranted when the input attenuator is set to give an average
mixer level of
−13 dBm.
d. In order to meet this specified accuracy, the mixer level must be optimized for accuracy when measur-
ing node B Base Transmission Station (BTS) within 3 dB of the required -40 dBc ACPR. This opti-
mum mixer level is
−23 dBm, so the input attenuation must be set as close as possible to the average
input power
− (−23 dBm). For example, if the average input power is -5 dBm, set the attenuation to 18
dB. This specification applies for the normal 10 dB peak-to-average ratio (at 0.01
% probability) for
Test Model 1. Note that, if the mixer level is set to optimize dynamic range instead of accuracy, accu-
racy errors are nominally doubled.
e. ACPR accuracy at 3.2 MHz offset is warranted when the input attenuator is set to give an average
mixer level of
−12 dBm.