| 摘要 |
PURPOSE:To perform compensation without using any temperature sensor and to facilitate adjusting operation by providing three resistors among three terminals to which voltages signals of different temperature characteristics including zero are applied. CONSTITUTION:In a constant current circuit 200, a bridge circuit 100 which is supplied with a constant current transduces pressure into an electric signal by utilizing piezoelec tric effect and a correcting circuit 300 generates a temperature correction signal for temperature compensation. An adding circuit 400 adds the pressure signal of the circuit 100 to the temperature correction signal of the circuit 300 to compensate the tempera ture characteristic of the pressure signal from the circuit 100 and an amplifying circuit 500 amplifies and output the signal. At this time, one-terminal sides of the resistors R9 - R11 in the circuit 300 are connected to a terminal (d) where the voltage having the largest temperature characteristic is applied, the ground of 0 potential with the least temperature characteristics, and the resistance terminal of the circuit 400 where a voltage with an intermediate temperature characteristic is applied. For the purpose, the resistor R9 or R10 is trimmed to enable and facilitate the adjusting operation for the temperature characteristic of a temperature characteristic compensating current flowing to the resistance 11. |
