Method and device for measuring the distortion of a high-frequency power amplifier and method and means for automatically equalizing a high-frequency power amplifier

摘要

An equalizer for automatically equalizing a high-frequency power amplifier having a reference carrier generator which generates a reference carrier from a measured input signal of the high-frequency power amplifier, and a first synchronous demodulator while generating an input envelope curve from the measured input signal and from the reference carrier. A second synchronous demodulator which generates an in-phase component of an output envelope curve from the measured output signal of the high-frequency power amplifier and from the reference carrier, as well as a phase shifter which shifts the phase of the reference carrier 90° are also provided. A third synchronous demodulator generates a quadrature component of the output envelope curve from the measured output signal of the high-frequency power amplifier and from the reference carrier that has been shifted 90° in phase. A controller generates an amplitude correction control signal and/or a phase correction control signal from the input envelope curve, the in-phase component of the output envelope curve and/or the quadrature component of the output envelope curve. The control characteristic and/or phase characteristic of a predistorter is adjusted inversely to the control characteristic and/or phase characteristic of the high-frequency power amplifier by the amplitude correction factor and the phase correction factor.