Patent ID: 7033071
Filing Date: 2006-04-25
Classification: G01D

Abstract:
1. An apparatus for sensing an environmental temperature around a sensor as a temperature parameter signal and correcting a sensor signal outputted from the sensor based on the temperature parameter signal, said sensor having a usable temperature range, said temperature parameter signal depending on the environmental temperature, said sensor signal having a predetermined temperature dependent characteristic that varies within the usable temperature range depending on a variation of the environmental temperature, said apparatus comprising: a slope correction signal setting unit configured to output selectively one of a plurality of direct current signals according to the sensed temperature parameter signal, voltage levels of said plurality of direct current signals being determined to correspond to the predetermined temperature dependent characteristic of the sensor signal; an absolute correction signal setting unit configured to set an absolute direct current signal for correcting the predetermined temperature dependent characteristic over the usable temperature range; an analog amplifying circuit connected to the slope correction signal setting unit and configured to amplify the outputted direct current signal according to the sensed temperature parameter signal; and an analog arithmetic circuit connected to the analog amplifying circuit and configured to carry out a predetermined arithmetic operation based on the outputted direct current signal from the slope correction signal setting unit, the absolute direct current signal, the amplified direct current signal and the sensor signal.