INTEGRATING CAPACITY-VOLTAGE CONVERTER

摘要

PURPOSE: An integrating capacity-voltage converter is provided to convert a variance of non-linear capacity of a pressure sensor to a linear detection voltage without using an additional memory by using a fully differential capacity type pressure sensor. CONSTITUTION: An integrating capacity-voltage converter includes an integrator(300) and a differential amplifier(400). The integrator(300) is used for feeding back output signals and integrating input voltages according to the applied pressure. The differential amplifier(400) is used for feeding back the output voltages of the integrator(300) and amplifying differentially the integrated voltages. The integrator(300) includes an operational amplifier(310), a fully differential capacity type pressure sensor, the first and the second feedback switching portions(320,330), and a charge portion(340). The operational amplifier(310) is used for amplifying the input voltages and the feedback voltages. The fully differential capacity type pressure sensor includes the first and the second capacitors which are varied by the applied pressure. The first and the second feedback switching portions(320,330) feeds back the output voltages of the operational amplifier(310). The charge portion(340) includes a charge portion to supply the feedback voltages to the operational amplifier(310).