Invention Grant
- Patent Title: Stress control during processing of a MEMS digital variable capacitor (DVC)
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Application No.: US14898678Application Date: 2014-06-04
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Publication No.: US09754724B2Publication Date: 2017-09-05
- Inventor: Robertus Petrus Van Kampen , Richard L. Knipe
- Applicant: CAVENDISH KINETICS, INC.
- Applicant Address: US CA San Jose
- Assignee: CAVENDISH KINETICS, INC.
- Current Assignee: CAVENDISH KINETICS, INC.
- Current Assignee Address: US CA San Jose
- Agency: Patterson & Sheridan, LLP
- International Application: PCT/US2014/040824 WO 20140604
- International Announcement: WO2014/209556 WO 20141231
- Main IPC: H01L49/02
- IPC: H01L49/02 ; H01G5/16 ; H01G5/18

Abstract:
The present invention generally relates to a MEMS digital variable capacitor (DVC) (900) and a method for manufacture thereof. The movable plate (938) within a MEMS DVC should have the same stress level to ensure proper operation of the MEMS DVC. To obtain the same stress level, the movable plate is decoupled from CMOS ground during fabrication. The movable plate is only electrically coupled to CMOS ground after the plate has been completely formed. The coupling occurs by using the same layer (948) that forms the pull-up electrode as the layer that electrically couples the movable plate to CMOS ground. As the same layer couples the movable plate to CMOS ground and also provides the pull-up electrode for the MEMS DVC, the deposition occurs in the same processing step. By electrically coupling the movable plate to CMOS ground after formation, the stress in each of the layers of the movable plate can be substantially identical.
Public/Granted literature
- US20160126017A1 STRESS CONTROL DURING PROCESSING OF A MEMS DIGITAL VARIABLE CAPACITOR (DVC) Public/Granted day:2016-05-05
Information query
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