ADL5535 Data Sheet
Rev. A | Page 12 of 16
ACPR PERFORMANCE
Figure 18 shows a plot of the adjacent channel power ratio
(ACPR) vs. P
OUT
for the ADL5535. The signal type used is a
single wideband code division multiple access (W-CDMA)
carrier (Test Model 1-64). This signal is generated by a very
low ACPR source. ACPR is measured at the output by a high
dynamic range spectrum analyzer that incorporates an instru-
ment noise-correction function. At an output power level of
+8 dBm, ACPR is still very low at −65 dBc, making the device
suitable for use in driver applications.
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ACPR (dBc)
P
OUT
(dBm)
380MHz
190MHz
190MHz SOURCE POWER
OUTPUT REFERRED
380MHz SOURCE POWER OUTPUT REFERRED
Figure 18. ACPR vs. P
OUT
, Single W-CDMA Carrier (Test Model 1-64)
at 190 MHz and 380 MHz
ERROR VECTOR MAGNITUDE (EVM) PERFORMANCE
Error vector magnitude (EVM) is a measure used to quantify the
performance of a digital radio transmitter or receiver. A signal
received by a receiver has all constellation points at their ideal
locations; however, various imperfections in the implementation
(such as magnitude imbalance, noise floor, and phase imbalance)
cause the actual constellation points to deviate from their ideal
locations. The ADL5535 shows excellent performance when used
with higher-order modulation schemes, such as a 16 QAM.
Figure 19 illustrates the EVM performance of the ADL5535 when
driven with a 16 QAM 10 Msym/s signal. Degradation of the EVM
performance starts to occur at an output power of +12 dBm.
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10 12
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16 18
EVM (dB)
P
OUT
(dBm)
380MHz SOURCE POWER OUTPUT REFERRED
380MHz
190MHz
190MHz SOURCE POWER
OUTPUT REFERRED
Figure 19. EVM Performance vs. P
OUT
with a 16 QAM, 10 Msym/s Signal
