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> - 16<br />
ADS RF Predistorti<strong>on</strong> Simulati<strong>on</strong><br />
Simulati<strong>on</strong> Parameters:<br />
1) Multi-t<strong>on</strong>e Modulati<strong>on</strong> (Fc(<br />
Fc=800<br />
MHz, BW=25 MHz)<br />
2) 64 entry look-up table<br />
3) Complex gain look-up table technique<br />
4) linear c<strong>on</strong>vergence parameter is -0.1<br />
5) Behavioral model for <strong>Power</strong> Amplifier<br />
6) Ideal passive comp<strong>on</strong>ents assumed<br />
<strong>Digital</strong> Predistorti<strong>on</strong> <strong>of</strong> <strong>Power</strong> Amps<br />
June, 01<br />
Page 16<br />
The ADS digital baseband predistorter simulati<strong>on</strong> example is based <strong>on</strong> the complex gain look-up<br />
table technique. Where we utilize the linear c<strong>on</strong>vergence method to adapt the LUT entries so as to<br />
minimize the level <strong>of</strong> undesired distorti<strong>on</strong>. The LUT c<strong>on</strong>sists <strong>of</strong> <strong>on</strong>ly 64 entries which are indexed<br />
by a 6 bit A/D c<strong>on</strong>verter. The power amplifier used in this example has a behavioural model. We<br />
have assumed the passive comp<strong>on</strong>ents, such as the power splitters and combiners are ideal.<br />
For dem<strong>on</strong>strati<strong>on</strong> purposes we have used a multi-t<strong>on</strong>e input centered <strong>on</strong> 800 MHz. The<br />
bandwidth has been exaggerated to dem<strong>on</strong>strate the adaptati<strong>on</strong> requirements for wide<br />
bandwidths.
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