Patent ID: 9541396
Date: 2017-01-10
CPC Classifications: G01C,G01P

Claim:
1. A system comprising an integrated multi-axis MEMS inertial sensor architecture, the system comprising: a substrate member having a surface region; a CMOS IC layer overlying the surface region, the CMOS IC layer having a CMOS surface region, the CMOS IC layer having an Application Specific Integrated Circuit (ASIC) comprising: an Automatic Gain Control (AGC) loop circuit, the AGC loop circuit including: a sense path having Charge Sense Amplifier (CSA_SNS), a Programmable Gain Amplifier (PGA1), a mixer, another Programmable Gain Amplifier (PGA2), a Low Pass Filter (LPF), an A/D converter (ADC), and digital processing circuits; a MEMS gyroscope overlying the CMOS surface region, the MEMS gyroscope electrically coupled to the ASIC; and a MEMS accelerometer overlying the CMOS surface region, the MEMS accelerometer being electrically coupled to the ASIC; wherein the Application Specific Integrated Circuit (ASIC) further comprises an input multiplexer coupled to the A/D converter (ADC), wherein the MEMS gyroscope and MEMS accelerometer are coupled to the input multiplexer, wherein the ADC is shared between the MEMS gyroscope and MEMS accelerometer via the input multiplexer; wherein out of plane sense signal plates are shielded with metal shield on sides as well as on layers below the sense plates.