Hermetically sealed absolute and differential pressure transducer
First Claim
1. 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.
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Accused Products
Abstract
A single chip dielectrically isolated leadless pressure sensor adapted to substantially simultaneously measure a first pressure and a differential between the first pressure and a second pressure including: a wafer including first and second recessed portions respectively defining first and second deflectable diaphragms and at least one rim portion formed between the first and second recessed portions for isolating the first deflectable diaphragm from the second deflectable diaphragm; a first circuit mounted on the first deflectable diaphragm and being responsive to the first pressure; and a second circuit mounted on the second deflectable diaphragm and being responsive to the second pressure; wherein, the 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 the first and second pressures, while simultaneously partially providing an output indicative of the first or second pressures.
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Citations
20 Claims
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1. 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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
in a first mode, said transducer is adapted to provide said output indicative of said differential and said second output simultaneously; and
,in a second mode, said transducer is adapted to provide said second and third outputs simultaneously.
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12. A pressure sensing assembly comprising:
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a wafer including first and second recessed portions respectively forming first and second deflectable diaphragms, at least one rim isolating said first diaphragm from said second diaphragm, and first and second circuits each respectively formed on an associated one of said first and second diaphragms, said first and second circuits each being dielectrically isolated from its respectively associated diaphragm and adapted to provide an output indicative of an amount of deflection of said associated diaphragm; and
,a member including first and second ports respectively opening to a first aperture passing there through to said first diaphragm and a second aperture passing through to said second diaphragm, whereby when said first port is exposed to a first pressure to be measured said first diaphragm is exposed to a said first pressure through said first aperture, and when said second port is exposed to a second pressure to measured said second diaphragm is exposed to said second pressure through said second aperture;
wherein, said first and second circuits are adapted to be electrically coupled together to cooperatively provide a first output indicative of a differential between said first and second pressures to be measured, and said second circuit is further adapted to be simultaneously coupled to another circuit to cooperative therewith provide a second output indicative of said second pressure to be measured. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification