Design of class-E<inf>M</inf> power amplifier with one input signal

Design of Class-E$_{\rm M}$ Oscillator With Second Harmonic Injection

“…The proposed circuit is also regarded as an improved version of the classamplifier [20]. By reducing the number of input signals from two to one, the driver-circuit design of the proposed circuit is much simpler than that of the classamplifier for the fixed frequency and the fixed dc-supply voltage applications.…”

“…Fig. 3(a) shows a circuit topology of the classpower amplifier [15]- [20]. The classamplifier has the main and injection circuits.…”

“…The design of the driving circuit is one of the problems for the classamplifier. This paper, which was previously presented in part at ECCE 2009 [20], 1 presents the classoscillator with the second-harmonic injection. In the proposed oscillator, the output frequency of the proposed oscillator is locked with the input frequency of the injection circuit.…”

“…The classpower amplifier [15]- [20] is an improved version of the class-E amplifier [8]- [13], which has the main and injection circuits. By injecting the second-harmonic current to the switch, the main circuit satisfies not only the class-E ZVS/ZVDS conditions at the transistor turn-on instant but also zero-current switching (ZCS) and zero-current-derivative switching (ZCDS) conditions at the transistor turn-off instant.…”

Push-Pull Class-${\rm E}_{\rm M}$ Power Amplifier for Low Harmonic-Contents and High Output-Power Applications

“…In order to obtain the values of the unknown parameters, the Newton's method is applied to solve the algebraic equations. It is possible to derive the algebraic-equation solutions numerically because the circuit equations are obtained in (3). The algorithm of the Newton's method was presented in [8] in detail.…”