AMPLIFIER, GALVANO UNIT, AND LASER PROCESSING MACHINE

PROBLEM TO BE SOLVED: To obtain an amplifier capable of enhancing power utilization efficiency while a supply power source voltage is made variable.SOLUTION: An amplifier includes: supply power sources 4, 7 which output while varying a supply voltage on the basis of an input signal; supply power sources 5, 8 having a higher supply voltage than the supply power sources 4, 7; transistors Tr2, Tr6 connected to the supply power sources 4, 7, and performing an amplification operation on the basis of the input signal; and transistors Tr4, Tr8 connected to the supply power sources 5, 8 and the transistors Tr2, Tr6, and performing an amplification operation on the basis of the input signal. When the voltage of an output signal from the transistors Tr2, Tr6 is within a voltage range capable of being supplied by the supply power sources 4, 7, the transistors Tr2, Tr6 perform an amplification operation to output an output signal, and, when the voltage of an output signal from the transistors Tr2, Tr6 exceeds a voltage capable of being supplied by the supply power sources 4, 7, the transistors Tr4, Tr8 perform an amplification operation to output an output signal via the transistors Tr2, Tr6. 【課題】供給電源電圧を可変しつつ電力利用効率を向上可能な増幅器を得ること。【解決手段】入力信号に基づいて供給電圧を変動して出力する供給電源４，７と、供給電圧が供給電源４，７より大きい供給電源５，８と、供給電源４，７と接続し、入力信号に基づいて増幅動作を行うトランジスタＴｒ２，６と、供給電源５，８およびトランジスタＴｒ２，６と接続し、入力信号に基づいて増幅動作を行うトランジスタＴｒ４，８と、を備え、トランジスタＴｒ２，６からの出力信号の電圧が供給電源４，７で供給可能な電圧範囲の場合、トランジスタＴｒ２，６が増幅動作を行って出力信号を出力し、トランジスタＴｒ２，６からの出力信号の電圧が供給電源４，７で供給可能な電圧を超える場合、トランジスタＴｒ４，８が増幅動作を行ってトランジスタＴｒ２，６経由で出力信号を出力する。【選択図】図１