Patent ID: 6272928
Filing Date: 2001-08-14
Classification: G01L

Abstract:
A dielectrically isolated single chip pressure sensor adapted to substantially simultaneously measure a first absolute pressure and a differential between said first pressure and a second absolute pressure comprising:a semiconductor wafer including first and second recessed portions and at least one rim portion formed between said first and second recessed portions, said first and second recessed portions defining first and second deflectable diaphragms and said rim portion isolating said first deflectable diaphragm from said second deflectable diaphragm;a first open four arm Wheatstone Bridge circuit mounted on said first deflectable diaphragm so as to be dielectrically isolated therefrom and responsive to said first pressure; and,a second open four arm Wheatstone Bridge circuit mounted on said second deflectable diaphragm so as to be dielectrically isolated therefrom and being responsive to said second pressure;wherein, said first and second circuits are adapted to be electrically coupled to one another so as to cooperatively provide a common output indicative of a differential pressure associated with said first and second pressures while simultaneously partially providing an output indicative of said first or second pressures.