Multi-carrier transmitter circuit and communication equipment

Abstract

To reduce the size of a multi-carrier transmitter circuit for a mobile communication base station, by suppressing instantaneous peak output power to a small value with respect to a wide-band signal of a few MHz to tens of MHz so that the peak factor of a multi-carrier signal is reduced. In a multi-carrier transmitter circuit for modulating carriers with corresponding input signals to generate modulated signals and then multiplexing said modulated signals and outputting a multiplexed signal, the multi-carrier transmitter circuit is equipped with carrier generators - to -n for generating each said carrier, modulators - to -n for modulating each carrier with each input signal and outputting said modulated signal, an adder for multiplexing said modulated signals and outputting the multiplexed signal, variable attenuators - to -n for directly or indirectly adjusting a level of each input signal, phase detectors - to -n for detecting a phase of each carrier, and a control circuit for controlling the variable attenuators - to -n in accordance with the phase of each carrier.