Patent ID: 6973836
Filing Date: 2005-12-13
Classification: G01L

Abstract:
1. A semiconductor pressure sensor comprising: a semiconductor substrate having a diaphragm for receiving pressure and a bridge circuit for detecting distortion of the diaphragm corresponding to the pressure, wherein the bridge circuit includes a pair of first a pair of second gauge resistors, wherein the first gauge resistors are disposed on a center gauge resistors and of the diaphragm, and the second gauge resistors are disposed on a periphery of wherein the diaphragm, and each first gauge resistor has a first resistance, which is larger than a second resistance of each second gauge resistor, wherein the bridge circuit has a predetermined ratio of resistance between the second resistance and the first resistance, wherein the diaphragm has another predetermined ratio of thermal stress between a second thermal stress to be applied to the second gauge resistor and a first thermal stress to be applied to the first gauge resistor in a case where a thermal stress is applied to the substrate, and wherein the predetermined ratio of resistance is equal to the predetermined ratio of thermal stress.