MEASURING METHOD AND DEVICE FOR MEASURING THE DISTORTION OF A HIGH FREQUENCY POWER AMPLIFIER AND CORRECTION METHOD AND DEVICE FOR THE AUTOMATIC CORRECTION OF A HIGH FREQUENCY POWER AMPLIFIER

摘要

The invention relates to a correcting device for automatically correcting a high frequency power amplifier. Said correcting device has a mechanism for generating a reference carrier from a measured input signal (7) of the high frequency power amplifier, and a first synchronous demodulator (8) for generating an input envelope curve from the measured input signal (7) and from the reference signal. The inventive device also has a second synchronous demodulator (9) for generating an inphase component of an output envelope curve from the measured output signal (6) of the high frequency power amplifier (3) and from the reference carrier, as well as a phase modifier (12) for displacing the phase of the reference carrier by 90°. A third synchronous demodulator (10) generates a quadrature component of the output envelope curve from the measured output signal (6) of the high frequency power amplifier (3) and from the reference carrier which is by 90° out of phase. A control device (24) generates an amplitude correction control signal and/or a phase correction control signal from the input envelope curve, from the inphase component of the output envelope curve and/or from the quadrature component of the output envelope curve. The modulation characteristic and/or phase characteristic of a correcting device (2) is set by the amplitude correction factor and the phase correction factor inversely to the modulation characteristic and/or the phase characteristic of the high frequency power amplifier (3).