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58 Chapter 1
Agilent EXA Signal Analyzer
Power Suite Measurements
On 5 MHz Filtered
IBW
−73 dB −8 dBm
On 10 MHz Filtered
IBW
−76 dB −2 dBm
RRC Weighting Accuracy
n
White noise in Adjacent Channel
TOI-induced spectrum
rms CW error
0.00 dB nominal
0.001 dB nominal
0.012 dB nominal
a. The effect of scale fidelity on the ratio of two powers is called the relative scale fidelity. The
scale fidelity specified in the Amplitude section is an absolute scale fidelity with –35 dBm at
the input mixer as the reference point. The relative scale fidelity is nominally only 0.01 dB
larger than the absolute scale fidelity.
b. See Amplitude Accuracy and Range section.
c. See Frequency and Time section.
d. Expressed in decibels.
e. An ACP measurement measures the power in adjacent channels. The shape of the response
versus frequency of those adjacent channels is occasionally critical. One parameter of the
shape is its 3 dB bandwidth. When the bandwidth (called the Ref BW) of the adjacent channel
is set, it is the 3 dB bandwidth that is set. The passband response is given by the convolution
of two functions: a rectangle of width equal to Ref BW and the power response versus fre-
quency of the RBW filter used. Measurements and specifications of analog radio ACPs are
often based on defined bandwidths of measuring receivers, and these are defined by their
−6 dB widths, not their −3 dB widths. To achieve a passband whose −6 dB width is x, set the
Ref BW to be .
f. Most versions of adjacent channel power measurements use negative numbers, in units of
dBc, to refer to the power in an adjacent channel relative to the power in a main channel, in
accordance with ITU standards. The standards for W-CDMA analysis include ACLR, a posi-
tive number represented in dB units. In order to be consistent with other kinds of ACP mea-
surements, this measurement and its specifications will use negative dBc results, and refer to
them as ACPR, instead of positive dB results referred to as ACLR. The ACLR can be deter-
mined from the ACPR reported by merely reversing the sign.
g. 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.
h. The Fast method has a slight decrease in accuracy in only one case: for BTS measurements at
5 MHz offset, the accuracy degrades by ±0.01 dB relative to the accuracy shown in this table.
Description Specifications Supplemental Information
x
0.572 RBW×
–