| 摘要 |
PURPOSE:To eliminate regulation for each unit of sensor, and deal with sensors of different specifications with a common hardware by providing an amplifica tion factor regulation circuit and an offset regulation circuit. CONSTITUTION:An atmospheric pressure PI is applied to an atmospheric pressure sensor 1, and an offset regulation signal S0 to input 7a/output 7b an offset reduction pattern of offset regulation data Do0 is reduced. Offset voltage value at an amplification circuit 3 is then reduced. Next, an, atmospheric pressure P2 is applied to the sensor 1, and amplification factor regulation signal Sg to input 8a/output 8b amplification factor increasing pattern of amplification factor regulation data Dg is increased. An amplification factor at the circuit 3 is then increased. By providing an offset regulation circuit 7 and an amplification factor regulation circuit 8, regulation by the unit of sensor is not required even for a sensor of which sensitivity and offset irregularity is large, so sensor completion yield is improved. Even in the case where sensors of different specifications are used, common hardware can be applied, thereby regulation processes can be simplified, with the cost reduced. |
