Patent ID: 9574907
Date: 2017-02-21
CPC Classifications: G01D

Claim:
1. A measurement circuit for a microelectromechanical system (MEMS), comprising: a sensing node for measuring a state of the MEMS; an integrator; a first capacitor including a first terminal of the first capacitor connected to the sensing node and a second terminal of the first capacitor connected to an input of the integrator, wherein the input of the integrator is connected to the sensing node through the first capacitor; a reference voltage circuit node connected to the second terminal of the first capacitor; an analog-to-digital converter (ADC) including an input coupled to an output of the integrator and an output providing a digital signal representative of the state of the MEMS; a digital-to-analog converter (DAC) including an input coupled to the output of the ADC; and a second capacitor including a first terminal of the second capacitor connected to an output of the DAC and a second terminal of the second capacitor connected to the sensing node, wherein the input of the integrator is connected to the output of the DAC through the first capacitor and second capacitor.