Patent ID: 7082830
Filing Date: 2006-08-01
Classification: B60R,G01D,G01P

Abstract:
1. A physical quantity sensor comprising: a physical quantity transducer sensing a physical quantity acting on the physical quantity transducer by outputting an electrical detection signal corresponding to a magnitude of the physical quantity; a first amplifier amplifying the detection signal at a first gain given to the first amplifier to produce a first physical quantity signal depending in level on the detection signal; a second amplifier amplifying the first physical quantity signal at a second gain given to the second amplifier to produce a second physical quantity signal, the second physical quantity signal being larger in magnitude than the first physical quantity signal; a drift correcting circuit, which is made up of a digital filter, removing a drift signal component from the second physical quantity signal; a D/A converter D/A-converting the second physical quantity signal subjected to the removal of the drift signal component at the drift correcting circuit, whereby a D/A-converted second physical quantity signal is provided to the second amplifier; a multiplexer using both of the first physical quantity signal and the second physical quantity signal subjected to the removal of the drift signal component at the drift correcting circuit to produce a single signal consisting of the first and second physical quantity signals alternately selected and lined up sequentially in time; and an A/D converter applying A/D-conversion to both of the first physical quantity signal and the second physical quantity signal subjected to the removal of the drift signal component.