Analog Devices ADRV9002

Preliminary Technical Data UG-1828
Rev. PrB | Page 179 of 277
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0
0 2000 4000 6000 8000 10000 12000 14000 16000 18000
OUTPUT AMPLITUDE (Linear)
INPUT AMPLITUDE (Linear)
50
–50
–40
–30
–20
–10
10
0
20
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40
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
RELATIVE PHASE ANGLE (Degrees)
INPUT AMPLITUDE (Linear)
×10
4
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Figure 170. Raw Transmit Signal Input vs. Nonlinearized Power Amplifier Output
18000
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12000
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0
0 2000 4000 6000 8000 10000 12000 14000 16000 18000
OUTPUT AMPLITUDE (Linear)
INPUT AMPLITUDE (Linear)
50
–50
–40
–30
–20
–10
10
0
20
30
40
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
RELATIVE PHASE ANGLE (Degrees)
INPUT AMPLITUDE (Linear)
×10
4
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Figure 171. Raw Transmit Signal Input vs. Linearized Power Amplifier Output
Figure 171 shows an example ACPR performance before and after DPD. The blue curve represents the ACPR performance before DPD,
from which, spectral regrowth could be observed. The black curve represents the ACPR performance after DPD. It is obvious that the
ACPR performance is significantly improved.
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Figure 172. ACPR Performance Before and After DPD