Patent ID: 7142034
Filing Date: 2006-11-28
Classification: G01L

Abstract:
1. A charge signal converting amplifier, comprising: a signal converting circuit operable to convert a sensor charge signal proportional to a mechanical load into a voltage signal and operable to output said voltage signal, the signal converting circuit comprising: an automatic correcting circuit responsive to said voltage signal operable to correct automatically drift in a positive direction, due to a temperature change, and drift in a negative direction, due to a charge leakage, generated in an input signal transmitting system, the automatic correcting circuit comprising a switching element operable to conduct a signal line between the amplifier and the voltage converting capacitor to a zero point; the automatic correcting circuit being further operable to set an output level of said signal converting circuit to a same level at a start time and an end time of cycles of said mechanical load using the switching element.