Physical quantity sensor

• Main Author: NAGATA YOICHI
• Format: Patent
• Language: Chinese; English
• Published: 09.11.2011
• Subjects: ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; GYROSCOPIC INSTRUMENTS; MEASURING; MEASURING DISTANCES, LEVELS OR BEARINGS; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; NAVIGATION; PHOTOGRAMMETRY OR VIDEOGRAMMETRY; PHYSICS; SURVEYING; TARIFF METERING APPARATUS; TESTING

A physical quantity sensor includes a sensor element for converting a physical quantity applied from outside into an electric signal, a detection circuit for amplifying and detecting an output signal of the sensor element, and an adjusting circuit for adjusting the output signal from the detection circuit to a predetermined signal. The adjusting circuit has an amplifying circuit for amplifying the output signal from the detection circuit and a reference amplification circuit having an amplification ratio linked with the amplifying circuit. With this configuration, it is possible to change theamplification ratio of the amplifying circuit provided in the adjusting circuit in accordance with a power voltage. As a result, it is possible to realize a physical quantity sensor having stable sensor detection sensitivity and highly accurate ratiometric characteristic.