Presentation on Digital Predistortion of Power Amplifiers - Agilent ...
Presentation on Digital Predistortion of Power Amplifiers - Agilent ...
Presentation on Digital Predistortion of Power Amplifiers - Agilent ...
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<strong>Digital</strong> Predistorti<strong>on</strong> - 27<br />
Multi-T<strong>on</strong>e Simulati<strong>on</strong> <strong>of</strong> Predistorter<br />
Before Before<br />
After After<br />
-34 -34 dBc dBc<br />
-54 -54 dBc dBc<br />
dBm dBm<br />
dBm dBm<br />
Frequency Frequency (MHz) (MHz)<br />
Frequency Frequency (MHz) (MHz)<br />
<strong>Digital</strong> Predistorti<strong>on</strong> <strong>of</strong> <strong>Power</strong> Amps<br />
June, 01<br />
Page 27<br />
The first figure shows that driving the power amplifier at 5dB back-<strong>of</strong>f generates high<br />
levels <strong>of</strong> intermodulati<strong>on</strong> power. The sec<strong>on</strong>d figure shows the resultant output from the<br />
digital baseband predistorter <strong>on</strong>ce the LUT entries have adapted. We can observe the<br />
spectral growth that occurs using a predistorter. The adjacent channel power is spread<br />
over a wider bandwidth but the mask requirements can be meet.
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