Analytical Design Equations for Class-E Power Amplifiers with Finite DC-Feed Inductance and Switch On-Resistance


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Acar, Mustafa and Annema, Anne Johan and Nauta, Bram (2007) Analytical Design Equations for Class-E Power Amplifiers with Finite DC-Feed Inductance and Switch On-Resistance. In: IEEE International Symposium on Circuits and Systems, ISCAS 2007, 27-30 May 2007 , New Orleans, LA.

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Abstract:Many critical design trade-offs of the class-E power amplifier (e.g power efficiency) are influenced by the switch on-resistance and the value of dc-feed drain inductance. In literature, the time-domain mathematical analyses of the class-E power amplifier with finite dc-feed inductance assume zero switch on-resistance in order to alleviate the mathematical difficulties; resulting in non-optimum designs. We present analytical design equations in this paper for class-E power amplifier taking into account both finite drain inductance and switch on-resistance. The analysis indicates the existence of infinitely many design equations; conclusions include: 1) class-E conditions (e.g. zero voltage and zero slope) can be satisfied in the presence of switch-on resistance. 2) The drain-efficiency (eta) of the class-E power amplifier is upper limited for a certain operation frequency and transistor technology. 3) Using a finite dc-feed inductance instead of an RF-choke in a class-E power amplifier can increase eta by ap 30%.
Item Type:Conference or Workshop Item
Copyright:© 2007 IEEE
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:
Link to this item:http://purl.utwente.nl/publications/58152
Official URL:http://dx.doi.org/10.1109/ISCAS.2007.378758
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