Patent ID: 7049729
Filing Date: 2006-05-23
Classification: G01L,H03F

Abstract:
1. An amplifier for converting a charge signal, comprising: a signal converting circuit for converting a charge signal from a sensor by an effect of a detecting target and by a converted signal into a voltage signal; and an automatic correction circuit including an amplifier circuit for detecting a leakage of the charges generated in a signal transmission system by an output level of the signal converting circuit, and including a switch which is actuated by an output of the amplifier circuit, the switch being conducted by an output of the amplifier circuit when the leakage of the charges is detected by the amplifier circuit to discharge an input charge of the signal converting circuit, thereby automatically correcting an output level of said signal converting circuit so that the output levels are the same at the start timing and the end timing for generating the charges of said sensor.