An improved calculation method of inductance and capacitances in π1 circuits for resonant power amplifiers

Archives of Electrical Engineering

Katarzyna Kulma¹  Juliusz Modzelewski¹ 

关键词: resonant-circuit design;    impedance transformation;    inductor quality factor;    loaded quality factor;    Class A;    Class AB;    Class B;    Class C;   

DOI  :  10.2478/v10171-012-0019-x

来源: Versita

【 摘 要 】

In the paper an improved method of calculation of the inductance and capacitances in the π1 circuit for Class A, AB, B, and C resonant power amplifiers is presented. This method is based on an assumption that the quality factor of the inductor is finite and the capacitors are lossless. The input parameters for calculations are the amplifier load resistance, the transistor load resistance, the quality factor of the inductor, the loaded quality factor of the designed circuit, and the operating frequency. The presented method allows reducing the required regulation range of π1 circuits elements in built resonant amplifiers as compared to the traditional calculation methods assuming lossless capacitors and inductor. This advantage is important, in particular, for long- and medium-wave transistor power amplifiers, where capacitances in π1 circuits are high comparing to typical trimming capacitors.

【 授权许可】

Unknown