| 摘要 |
PROBLEM TO BE SOLVED: To provide an amplifier circuit which easily suppresses an intermodulation distortion signal that is caused by amplification. SOLUTION: In a path of a first amplifier 102, the first amplifier 102 applies class A amplification to an input signal and amplifies the input signal by a multiple ofα. As a result, input signal components F<SB>1</SB>, F<SB>2</SB>with a powerαF and intermodulation distortion signal components (2F<SB>1</SB>-F<SB>2</SB>) and (2F<SB>2</SB>-F<SB>1</SB>) with a power F<SB>k1</SB>are produced. In a path of a second amplifier 103, the second amplifier 103 applies class AB amplification to the input signal, and amplifies the input signal by a multiple ofβ(α>β). As a result, input signal components F<SB>1</SB>, F<SB>2</SB>with a powerβF and intermodulation distortion signal components (2F<SB>1</SB>-F<SB>2</SB>) and (2F<SB>2</SB>-F<SB>1</SB>) with a power F<SB>k2</SB>are produced. Finally, a composite unit 104 composes: the input signal components F<SB>1</SB>, F<SB>2</SB>with the powerαF, and the intermodulation distortion signal components (2F<SB>1</SB>-F<SB>2</SB>) and (2F<SB>2</SB>-F<SB>1</SB>) with the power F<SB>k1</SB>, in a positive phase; and the input signal components F<SB>1</SB>, F<SB>2</SB>with the powerβF, and the intermodulation distortion signal components (2F<SB>1</SB>-F<SB>2</SB>) and (2F<SB>2</SB>-F<SB>1</SB>) with the power F<SB>k2</SB>, in an opposite phase. COPYRIGHT: (C)2007,JPO&INPIT
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