| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly accurate D/A converter.SOLUTION: A major part of a D/A converter 10 includes: a first switch SW1 connected to a first reference voltage Vr1; a second switch SW2 connected to a second reference voltage Vr2; and a third switch SW3 connected to a third reference voltage Vr3. Further, the D/A converter 10 includes: a first capacitor C1; a fourth switch SW4 connected to the third reference voltage Vr3; a fifth switch SW5 connected to the first capacitor C1 and the fourth switch SW4; an operational amplifier OP1 connected to the fifth switch SW5; and a second capacitor C2 connected to the fifth switch SW5 and the operational amplifier OP1. When an input digital signal with polarity is zero, there is performed switchover control to switch between a case when the first switch SW1 is closed and the second switch SW2 is opened, and a case when the first switch SW1 is opened and the second switch SW2 is closed.SELECTED DRAWING: Figure 1 |
