ACPM-7833 View Datasheet(PDF) - HP => Agilent Technologies
Part Name
Description
MFG CO.
'ACPM-7833' PDF : 21 Pages View PDF
ACPR Measurement Method
Adjacent-channel power ratio
(ACPR) is used to characterize
the distortion of power amplifiers
and other subsystems for their
tendency to cause interference
with neighboring radio channels
or systems. The ACPR measure-
ment often is specified as the
ratio of the power spectral
density (PSD) of the CDMA main
channel to the PSD measured at
several offset frequencies. For the
Cellular band (824 ~ 849 MHz
transmitter channel), the two
offsets are at ±885 kHz and
±1.98 MHz and the measurement
resolution bandwidth specified is
30 kHz. These offsets are at
±1.25 MHz and ±1.98 MHz for the
PCS band (1850 ~ 1910 MHz
transmitter channel).
1.23 MHz
0
-10
-20
-30
30 kHz
30 kHz
30 kHz
-40
-50
1st ACPR-L
1st ACPR-U
Offset frequency
-60
-70
2nd ACPR-L
= 1.98 MHz
-80
2nd ACPR-U
= 1.98 MHz
FREQUENCY (MHz)
Figure 16. CDMA Adjacent-Channel Power Ratio Measurement.
1st ACPR (dBc)
30 kHz
2nd ACPR (dBc)
14
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