Analysis of a Class-E Power Amplifier With Shunt Filter for Any Duty Ratio

The class-E power amplifier with shunt filter, which is also known as the class-E power amplifier with shunt capacitance and shunt filter, is proposed in this brief for any duty ratio. The basic circuit waveforms and design equations are derived and the design parameters of the circuit elements for some selected duty ratios are numerically solved. Subsequently, the characteristics of the class-E power amplifier with shunt filter are discussed. Also, a simulation example is carried out to verify the presented design method. Compared with the classical class-E power amplifier, the presented class-E power amplifier with shunt filter has a higher achievable maximum frequency and requires less quality factor of the filter. It is a promising candidate to design broadband and high-efficiency power amplifiers.