Closed-Form Design Equations for Class-E<sub>M</sub> Power Amplifier with Isolation Circuit

Mugisho, Moise Safari; Thian, Mury

doi:10.1109/inmmic.2018.8430014

Cited by 4 publications

(13 citation statements)

References 6 publications

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“…The main and auxiliary circuits each consisting of shunt capacitances (Cs1, Cs2), finite DC-feed inductances (LC1, LC2), a series resonant circuit (L1C1 tuned at f0, L2C2 tuned at 2f0), and series reactances (X1, X2). The purpose of the auxiliary circuit and the working principle of the isolation circuit are explained in [2].…”

Section: Circuit Analysismentioning

confidence: 99%

“…The load network parameters of the main circuit given in (9)-(10) are obtained by applying the condition for maximum drain efficiency (DE) in a Class-EM PA, derived in [2] and using Fourier series expansion of vs1(θ). Subsequently, Iinj is given in (10).…”

Section: Circuit Analysismentioning

confidence: 99%

“…It was shown in [2] that the DC power of the auxiliary circuit (PDC2) is one-third of the DC power of the main circuit (PDC1), and consequently, IDC1 and IDC2 can be used to determine the required DC supply voltage of the auxiliary circuit VDC2 for a prescribed VDC1, where IDC1 and IDC2 are the average values of is1(θ) and is2(θ) respectively.…”

Section: Circuit Analysismentioning

confidence: 99%

“…The DC currents IDC1 and IDC2 were obtained as 234 mA and 184 mA respectively. Using condition (11) from [2], PDC1 = 6.55 W and Pout = 8.74 W were obtained. The load network parameters of the main circuit are determined using (9)-(10): Ropt = 6.1 Ω, LC1 = 2.97 nH, Cs1 = 0.43 pF, and Cx1 = 3.74 pF.…”

Section: Design Example and Verificationmentioning

confidence: 99%

“…However, it was shown in [2] that some of the core design equations presented in [1] are incorrect and ambiguous while the analyses in [3]- [4] result in a large system of nonlinear equations whose solutions offer little insights into how the circuit operates, thus hampering the widespread usage thereof. Although the simplified and accurate analysis presented in [2] results in explicit design equations, the optimum fundamental-frequency load impedance Zopt(f0) presented to the main switch is capacitive. This poses a major problem in the implementation since many commercially available power devices require inductive loading at the fundamental frequency (f0) in order to achieve high-efficiency operations.…”

Section: Introductionmentioning

confidence: 99%

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Analysis and Design of a High-Efficiency Class-E_M Power Amplifier

Mugisho

Thian

Grebennikov³

2019

2019 IEEE Radio and Wireless Symposium (RWS)

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The Class-EM power amplifier (PA) offers the possibility of achieving high-efficiency operations at high operating frequencies while using slow-switching transistors. This is made possible by the adoption of the ZVS/ZVDS/ZCS and ZCDS conditions on the main circuit and the adoption of the ZVS condition on the auxiliary circuit. In this paper, we present the analysis and design of a new topology of the Class-EM PA incorporating a finite DC-feed inductance and an isolation circuit, rendering it more attractive for implementations. Furthermore, we propose a novel transmission-line load network that provides the drain of the transistor with the required load impedances at the fundamental frequency as well as at even and odd harmonic frequencies for the main and the auxiliary circuits. The concept is verified through harmonicbalance simulations with the PA exhibiting a peak drain efficiency of 90.3%, a peak power added efficiency of 86.7%, and a peak output power of 41.2 dBm at an operating frequency of 1.5 GHz.

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Section: Circuit Analysismentioning

confidence: 99%

Section: Circuit Analysismentioning

confidence: 99%

Section: Circuit Analysismentioning

confidence: 99%

Section: Design Example and Verificationmentioning

confidence: 99%