Patent ID: 8878313
Filing Date: 2014-11-04
Classification: G01L,H01L

Abstract:
1. A pressure sensor comprising: a sensor body having a monolithic body part and a diaphragm body part which are formed at least partly with electrically insulating material and have a cavity therebetween, the diaphragm body part at least partly facing said cavity and having thereon a detection element configured for detecting a bending or deformation of the diaphragm body part, the sensor body supporting a circuit arrangement which is in signal communication with the detection element, the circuit arrangement being prearranged for treating a signal generated by the detection element; wherein the monolithic body part has a first end face and a second end face opposite to each other and made of electrically insulating material, the first end face of the monolithic body part having a peripheral region and a central region which is recessed with respect to the peripheral region, such that said cavity is defined at said first end face to have a peripheral surface and a bottom surface formed of electrically insulating material of the monolithic body part; wherein the diaphragm body part has an inner side and an outer side, the inner side of the diaphragm body part being made of electrically insulating material and having a peripheral region bonded to the peripheral region of the first end face of the monolithic body part, such that a central region of the inner side of the diaphragm body part faces the recessed central region of the first end face of the monolithic body part, at a distance from the bottom surface of the cavity; wherein first conductive tracks are provided at the inner side of the diaphragm body part, which extend from the peripheral region to the central region thereof, a plurality of first circuit components being connected to the first conductive tracks at the central region of the inner side of the diaphragm body part to form said detection element, the first conductive tracks each having a connection end at the peripheral region of the inner side of the diaphragm body part; wherein the monolithic body part supports at the second end face thereof said circuit arrangement, which comprises a plurality of further circuit components, among which an integrated circuit consisting of a die made of a semiconductor material and free of package and projecting connection leads; wherein the circuit arrangement includes an electric circuit pattern comprising a plurality of second conductive tracks made of electrically conductive material directly deposited onto said second end face of the monolithic body part, the circuit arrangement comprising second circuit components electrically connected to said second conductive tracks; wherein said second conductive tracks are formed on said second end face of the monolithic body part such that a positioning region of said second end face is directly exposed, the semiconductor material at a lower surface of the die being bonded to said second end face at said positioning region, and the die being electrically connected to second conductive tracks or second circuit components by wire bonding including contact films made of electrically conductive material positioned on the semiconductor material at an upper surface of the die and micro-wires each extending between one said contact film and one said second conductive track or second circuit component; wherein the monolithic body part has a number of through-holes extending between said second end face and the peripheral region of the first end face, said though-holes having a length which is greater that the distance between said second end face and the bottom surface of said cavity; wherein an electrically conductive material is present in said through-holes, which electrically connects the connection ends of said first conductive tracks at the inner side of the diaphragm body part to respective second conduct tracks at the second end face of the monolithic body.