| 摘要 |
PROBLEM TO BE SOLVED: To provide a distortion compensation circuit capable of precisely compensating nonlinear distortion which is generated by a power amplifier without being mounted with any digital circuit of a large calculation scale with a simple feedback circuit configuration requiring no quadrature demodulator.SOLUTION: The distortion compensation circuit has a deviation calculation section 12 that analyzes the frequency of a feedback signal Mix2(t) output from an A/D converter 11; based on the analysis result of the frequency, identifies magnitude value Magand phase value θ of an analog signal after down-conversion by a mixer 10; based on the identified magnitude value Magand phase value θ and magnitude value Aand phase value θof a known signal, calculates a gain deviation ΔGain(n) and a phase deviation ΔPhase(n) on a power amplifier 7.SELECTED DRAWING: Figure 1 |
