| 摘要 |
PROBLEM TO BE SOLVED: To provide a wireless transmitter in which the amount of distortion compensation is great and transmission characteristics, in particular ACP (adjacent channel leak power) characteristics are kept excellent. SOLUTION: In the wireless transmitter, a signal obtained by distributing a feedback signal from a directional coupler 8 and signal obtained by distributing a local oscillation signal from a PLL frequency synthesizer 13, their phases being shifted by phase shifters 15A, 15B, are inputted to a quadrature demodulators 17A, 17B. The in-phase components of an input signal from a baseband signal generator 1 and of the signal demodulated by the quadrature demodulator 17A are added by an adder 3A, and the quadrature components thereof are operated by an adder 3B. Furthermore, the in-phase components of a signal from the adder 3A and of the signal demodulated by the quadrature demodulator 17B are operated by an adder 3C and the quadrature component of a signal from the adder 3B and of the signal demodulated by the quadrature demodulator 17B are operated by an adder 3D. The resulting outputted is modulated, amplified and transmitted from an antenna 11. COPYRIGHT: (C)2006,JPO&NCIPI
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