Achieving Stable Output Power and Efficiency of a Class E Power Amplifier while Changing the Self-Inductance of the Frequency Filter and the Load Resistance

— The high level of efficiency of class E power amplifiers (PAs) allows them to be used in portable devices, since at high output power levels a longer battery life can be achieved. The change in output power due to the deviation of the achieved operating mode even with small changes in the values o...

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Bibliographic Details
Published in:Russian microelectronics 2023-12, Vol.52 (7), p.677-681
Main Authors: Gurov, K. O., Mindubaev, E. A., Danilov, A. A.
Format: Article
Language:English
Subjects:
Capacitors
Efficiency
Electrical Engineering
Energy consumption
Engineering
Frequency filters
Inductance
Load resistance
Portable equipment
Power amplifiers
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Summary:— The high level of efficiency of class E power amplifiers (PAs) allows them to be used in portable devices, since at high output power levels a longer battery life can be achieved. The change in output power due to the deviation of the achieved operating mode even with small changes in the values of the frequency filter’s self-inductance and load resistance is a significant problem of a class E PA. This paper proposes a solution to this problem by dynamically changing the capacitances of capacitors in the load circuit of class E PAs, which depend on the values of the frequency filter’s self-inductance and load resistance. The possibility of achieving the nominal and two types of subnominal operating modes of class E PAs with a dynamic change in the capacitances of the capacitors in the load circuit in the range of frequency filter ratings and load resistance is studied. It is found that there are such values of the capacitances of capacitors through which it is always possible to achieve nominal or subnominal operating modes for any values of the remaining components of the circuit. At the same time, changing the values of the frequency filter and the load resistance with the subsequent achievement of the operating mode allows us to stabilize the required output power in class E PAs. The proposed class E PA scheme allows the stabilization of the output power at 0.65 W with an efficiency of at least 85% with the load resistance varying from 5 to 30 Ohm, and the self-inductance of the frequency filter, from 5 to 15 μH.
ISSN:1063-7397
1608-3415
DOI:10.1134/S1063739723070089