| 摘要 |
PROBLEM TO BE SOLVED: To provide an offset voltage compensation device that detects a true value of a DC output signal of a sensor section by compensating for an offset voltage of an amplifier while suppressing an increase in the number of components.SOLUTION: An offset voltage compensation device 1 includes: a sensor section 3 connected to a power supply 2 to measure a physical quantity and convert it to an output signal; a switch 4 for short-circuiting an input to the sensor section 3; an amplifier 5 for amplifying the output signal of the sensor section 3; and a computing element 6 for computing a quantity of electricity on the basis of an output of the amplifier 5. The computing element 6 subtracts, from an output of the amplifier 5 with the input to the sensor section 3 not short-circuited, an output of the amplifier 5 in such a short circuit state to extract a signal component difference. The signal component difference and a predetermined coefficient determined by a resistance value of the sensor section 3 and a resistance value of the switch 4 are next used to detect a true value of the output signal of the sensor section 3. |
