Patent ID: 7100451

Claim:
A pressure sensor comprising: a package having a cover enclosing a cavity therein; a piezoelectric substrate carried within the cavity, wherein a first surface of the substrate is dimensioned for carrying a SAW transducer pattern thereon and a second opposing surface of the substrate is carried in the cavity for a deforming of the substrate in response to pressure on the cover; a SAW transducer pattern carried on the first surface of the substrate, the SAW transducer pattern including an interdigital transducer serving as both an input and an output transducer for generating and detecting a SAW, and reflectors disposed on the first surface and positioned on opposing sides of the interdigital transducer; and at least two rows of bumps supporting the substrate within the cavity, wherein a SAW velocity change about the region of the bumps is dependent upon temperature and pressure applied to the sensor.