Patent ID: 6770503
Filing Date: 2004-08-03
Classification: B81B,G01P

Abstract:
A method of packaging a micromechanical sensor with an associated control circuit, comprising:fabricating the sensor on a front side of a first wafer of semiconductor material, said sensor having electrical contact points of electrical I/O; fabricating the control circuit on a front side of a second wafer of semiconductor material, said control circuit having electrical contacts; forming a cavity on the back side of the second wafer, the cavity being formed such that the sensor fits within the cavity when the front side of the first wafer is placed in an adjoining relationship with the back side of the second wafer; forming through-holes in the second wafer at locations adjacent to the cavity allowing access to the electrical contacts of the control circuit from the back side of the second wafer; depositing a patterned layer of metal on the back side of the second wafer and in the through holes to form electrical interconnections to the electrical contacts of the control circuit via the through-holes, the interconnections terminating in back-side termination points arranged such that electrical contact points of the sensor contact the termination points when the wafers are placed in an adjoining relationship; and subsequent to the depositing step, bonding the first wafer and the metallized second wafer together in the adjoining relationship.