| 摘要 |
<p>Five voltage dividing resistors (R1 - R5) are connected in series between the nodes of external power supply voltages (VDD, VEE) to obtain first to fourth divided voltages (V1, V2, V3, V4). A first power amplifier (AMP11) of an Ntop type for impedance conversion is connected to a node (83) of the first voltage (V1). A second power amplifier (AMP12) of a Ptop type for impedance conversion is connected to a node (84) of the second voltage (V2). A third power amplifier (AMP13) of the Ntop type for impedance conversion is connected to a node (85) of the third voltage (V3). A fourth power amplifier (AMP14) of the Ptop type for impedance conversion is connected to a node (86) of the fourth voltage (V4). In each of the first and third power amplifiers (AMP11, AMP13) of the Ntop type, the ability of causing a current to flow out of the amplifier from the output terminal (30) is set to be high, and the ability of causing a current to flow into the amplifier from the output terminal (30) is set to be low. In each of the second and fourth power amplifiers (AMP12, AMP14) of the Ptop type, the ability of causing a current to flow into the amplifier from the output terminal (40) is set to be high, and the ability of causing a current to flow out of the amplifier from the output terminal (40) is set to be low. <IMAGE></p> |
