| 摘要 |
PROBLEM TO BE SOLVED: To provide an amplifier capable of following up fast switching.SOLUTION: A power supply device includes: an envelope signal generation part which generates an envelope signal representing an envelope of a transmission signal inputted from an input terminal; a filter which is connected to a power input terminal of a power amplification part for amplifying the transmission signal, includes an inductor and a capacitor and cancels noise in supply power of the power amplification part; a conversion part which outputs a target voltage and an estimated current of the supply power on the basis of the envelope signal; a cancel part which includes an inductor part having the same inductance property as the inductor and a capacitor part having the same capacitance property as the capacitor, and outputs a target value of an input voltage of the filter on the basis of the target voltage and the estimated current which are outputted from the conversion part in such a manner that a voltage of power source power is inputted from an output terminal of the filter and an input voltage of the filter is outputted from an input terminal of the filter; and a switching part which performs switching between the cancel part and the filter.SELECTED DRAWING: Figure 1 |
