| 摘要 |
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. |
