Presentation on RF Predistortion of Power Amplifiers - Agilent ...
Presentation on RF Predistortion of Power Amplifiers - Agilent ...
Presentation on RF Predistortion of Power Amplifiers - Agilent ...
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Two-T<strong>on</strong>e Simulati<strong>on</strong> <strong>of</strong> <strong>RF</strong> Predistorter<br />
Before<br />
Before<br />
After<br />
After<br />
IMD IMD Products<br />
Products<br />
13 13 dB dB IMD IMD Reducti<strong>on</strong><br />
Reducti<strong>on</strong><br />
Frequency Frequency (1MHz/Div)<br />
(1MHz/Div)<br />
Frequency Frequency (1MHz/Div)<br />
(1MHz/Div)<br />
Adaptive <strong>RF</strong> Predistorter Using Rectangular Coordinate Work Functi<strong>on</strong><br />
15<br />
The plot <strong>on</strong> the left reveals the effects <strong>of</strong> driving the power amplifier at 5dB back-<strong>of</strong>f.<br />
High levels <strong>of</strong> intermodulati<strong>on</strong> power and harm<strong>on</strong>ics are generated. The plot at right<br />
shows the improvement in the output from the <strong>RF</strong> predistorter <strong>on</strong>ce the coefficients have<br />
adapted. We can observe the spectral growth that occurs using a predistorter. The<br />
adjacent channel power is spread over a wider bandwidth, but mask requirements can be<br />
meet.
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