Patent ID: 9635460
Date: 2017-04-25
CPC Classifications: H04R

Claim:
1. A microelectromechanical (MEMS) microphone comprising: a MEMS motor, the MEMS motor including at least a diaphragm and a charge plate, the MEMS motor configured to receive sound energy and transform the sound energy into an electrical signal; a gain adjustment apparatus, disposed on an integrated circuit and coupled to the MEMS motor, the gain adjustment apparatus comprising: an input configured to receive the electrical signal from the MEMS motor; an output; an amplifier configured to provide an output voltage at the output based upon a gain provided by the amplifier and the electrical signal; and a plurality of switchable capacitors, each of the plurality of switchable capacitors configured to be selectively connected to the input; wherein selective connection of the plurality of switchable capacitors to the input causes a sensitivity of the MEMS microphone to be within a predetermined specific target sensitivity range for the MEMS microphone; and wherein the plurality of switchable capacitors attenuate the output based at least in part upon a capacitance of the MEMS motor, a capacitance of the plurality of switchable capacitors that are connected to the input, and a capacitance of the integrated circuit.