Phase frequency characteristics evaluation for E-class devices output circuits

Abstract

Based on the unitarity of the E-class device circuit [S]-matrix, the phase frequency characteristics are estimated for the output circuit at any harmonic of the fundamental frequency. Formulas are derived for approximate phase frequency characteristics of an E-class device model with a switch that operates in two states corresponding to either zero or infinite active resistances. Using the example of the presented phase-frequency characteristics of the E-class power amplifier layout, the validity of the formulas obtained is confirmed. Taking into account the conclusions drawn from the formulas, recommendations are formulated for making additions to the well-known methods of designing E-class devices. These techniques can be supplemented by the introduction of parameter settings of the elements of the output circuits, for which the established estimated values of the phase frequency characteristics of the output circuit on harmonics are most respected with the maximum possible number of them.