Memory effect evaluation program, memory effect evaluation method, and memory effect evaluation apparatus

摘要

PPROBLEM TO BE SOLVED: To easily and previously evaluate memory effects of an amplifier. PSOLUTION: Two signals of different frequencies are input to an amplifier and an output waveform of the amplifier is measured to acquire a fundamental wave, third-order IMD (Inter Modulation Distortion) and fifth-order IMD (step S10). A coefficient corresponding to memoryless nonlinear distortion regardless of memory effects of the amplifier is then calculated from the fundamental wave, third-order IMD and fifth-order IMD obtained by the measurement (step S20). Continuously, a value representing characteristics of memory nonlinear distortion caused by the memory effects of the amplifier is calculated (step S30). When calculating these coefficient and characteristic value, an operation expression is used which represents a distortion occurrence model of the amplifier distinguishably considering memoryless nonlinear distortion and memory nonlinear distortion. PCOPYRIGHT: (C)2011,JPO&INPIT