| 摘要 |
PROBLEM TO BE SOLVED: To achieve compatibility between expansion of an output amplitude and reduction in power consumption. SOLUTION: A selection section 20 selects one of a plus-side power supply potential V1[+] and a plus-side power supply potential V2[+] which are different from each other. A potential generation circuit 30 generates a minus-side power supply potential V3[-] from the plus-side power supply potential V1[+], V2[+] that the selection section 20 selects. An amplifier 14 operates with the plus-side power supply potential V1[+] and minus-side power supply potential V3[-] as a power source to generate an output signal SC by amplifying an intermediate signal SB. A control circuit 40 controls the selection section 20 so as to select the plus-side power supply potential V1[+] when an amplitude αB of the intermediate signal SB is lower than a threshold αTH_B or the plus-side power supply potential V2[+] when the amplitude αB is larger the threshold αTH_B. COPYRIGHT: (C)2011,JPO&INPIT
|
