Leakage tolerant interface circuit with increased signal gain

A MicroElectroMechanical system (MEMS) interface circuit comprising:

• an input chopper circuit configured to apply an excitation voltage to a transducer by pre-charging the transducer with a plurality of bias voltages in a plurality of alternating sensing cycles to generate a transducer difference charge, wherein the input chopper circuit comprises two capacitors that form the transducer;
• an input common-mode control circuit configured to generate a common-mode voltage in response to the applied excitation voltage and to remove a common-mode charge injection caused by the applied excitation voltage;
• and
• a capacitance-to-voltage (C/V) and output chopper circuit configured to, in response to the common-mode voltage, integrate transducer difference charge on a plurality of capacitors to produce an output voltage.

A method for operating an interface circuit, the method comprising:

• applying an excitation voltage to a transducer by pre-charging the transducer with a plurality of bias voltages in a plurality of alternating sensing cycles and applying a voltage step to generate a transducer difference charge;
• generating a common-mode voltage in response to the applied excitation voltage;
• and
• in response to the common-mode voltage, integrating the transducer difference charge on a plurality of capacitors to produce an output voltage.