Abstract
In this paper, a harmonic control network (HCN) is presented to reduce the voltage stress (maximum MOSFET voltage) of the class E power amplifier (PA). Effects of the HCN on the amplifier specifications are investigated. The results show that the proposed HCN affects several specifications of the amplifier, such as drain voltage, switch current, output power capability (Cp factor), and drain impedance. The output power capability of the presented amplifier is also improved, compared with the conventional class E structure. High-voltage stress limits the design specifications of the desired amplifier. Therefore, several limitations can be removed with the reduced switch voltage. According to the results, the maximum drain voltage for the presented amplifier is reduced and subsequently, the output power capability is increased about 25% using the presented structure. Zero-voltage switching condition (ZVS) and zero-voltage derivative switching condition (ZVDS) are assumed in the design procedure. These two conditions are essential for high efficiency achievement in various classes of switching amplifiers. A class E PA with operating frequency of 1 MHz is designed and simulated using advanced design system (ADS) and PSpice software. The theory and simulated results are in good agreement.
Highlights
The main blocks in many communication systems are power amplifiers
Class E amplifiers are called DC-AC inverters, which are further divided into two main types: the Zero-voltage switching condition (ZVS) power amplifiers and the zero current switching (ZCS) power amplifiers
A harmonic control network (HCN) is designed and applied in the typical class E amplifier circuit to reduce the maximum value of the MOSFET voltage and to improve the Cp factor of the amplifier
Summary
The main blocks in many communication systems are power amplifiers. Power amplifiers are high-consumption elements, and so, their efficiency is an important factor in the design procedure [1,2,3]. Class E power amplifiers are very interesting for communication systems due to their high efficiency. Class E amplifiers are called DC-AC inverters, which are further divided into two main types: the ZVS power amplifiers and the zero current switching (ZCS) power amplifiers. Recent approaches have introduced several structures with improved MOSFET voltage and current waveforms, such as inverse class E [12,13,14], class EF [15,16,17], and class DE power amplifiers [18,19]. A harmonic control network (HCN) is designed and applied in the typical class E amplifier circuit to reduce the maximum value of the MOSFET voltage and to improve the Cp factor of the amplifier.
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