Patent ID: 7866215
Filing Date: 2011-01-11
Classification: G01L

Abstract:
1. A redundant pressure sensing device for producing a first and a second output proportional to an applied first and second pressure irrespective of vibration and acceleration of said device, comprising: a chip having a first pressure sensing device including first and second deflectable diaphragms and a second pressure sensing device including third and fourth deflectable diaphragms, said first and second pressure sensing devices electrically separated on said chip by an isolation groove; a plurality of piezoresistors mounted on each deflectable diaphragm; wherein said plurality of piezoresistors on said first and second diaphragms are electrically coupled together to provide a first output indicative of a first pressure; and wherein said plurality of piezoresistors on said third and fourth diaphragms are electrically coupled together to provide a second output indicative of a second pressure wherein said first and second outputs are substantially devoid of variations due to vibration and acceleration of said device.