Patent ID: 8658453
Filing Date: 2014-02-25
Classification: B06B

Abstract:
1. A method of producing an integrated circuit/transducer device including a substrate, a complementary-metal-oxide-semiconductor (CMOS) circuit over a CMOS circuit region on the substrate and a capacitive micromachined ultrasonic transducer (cMUT) element over a cMUT element region on the substrate, the method comprising: depositing a first layer over both the CMOS circuit region and the cMUT element region that; b) depositing a sacrificial layer after step a); c) depositing a dielectric layer over the CMOS circuit and cMUT element regions after step b); d) removing the sacrificial layer to form a cavity after step c); and e) depositing a second layer over both the CMOS circuit region and the cMUT element region after step d) that: