Aiming at the problem that temperature directly acquired from the temperature sensor is not accurate because of the violently varying temperature and the uneven temperature field distribution of sensor signal acquisition circuit at start-up period

a method that replaces the temperature with calibration scale factor at start-up period of the circuit is presented and then compensates the circuit scale factor.The calibration scale factor is acquired from calibration voltage at start-up period.The calibration scale factor follows the temperature change of each components.Circuit scale factor corresponds to temperature

so the relation expression between calibration scale factor and circuit scale factor at start-up period can be got.Compensate the circuit scale factor according to the above expression just mentioned and the calibration scale factor at start-up period.The experimental result indicates that after compensation with calibration scale factor at start-up period

repeatability of circuit scale factor in the range of 30 ℃ is improved remarkably

which provides a method for sensor signal acquisition circuit fast start-up in temperature-changeful environment.