Patent ID: 9505030
Filing Date: 2016-11-29
CPC Classification: A61B,B06B,B81B,B81C,H01L

Claim Text:
1. A complementary metal oxide semiconductor (CMOS) wafer, comprising: a semiconductor substrate; an ultrasonic transducer comprising: a cavity created by a partial removal of a first metallization layer of the CMOS wafer; an electrode disposed between the cavity and the semiconductor substrate; and an acoustic membrane comprising a dielectric layer and a second metallization layer of the CMOS wafer, the cavity being disposed between the semiconductor substrate and the acoustic membrane; and an integrated circuitry in the semiconductor substrate, coupled to the ultrasonic transducer and configured to control operation of the ultrasonic transducer; wherein the electrode disposed between the cavity and the semiconductor substrate is a first electrode of the ultrasonic transducer, and wherein the ultrasonic transducer further comprises a second electrode disposed opposite the first electrode, the second electrode disposed in the acoustic membrane between the cavity and the second metallization layer.