Patent ID: 9516415
Filing Date: 2016-12-06
CPC Classification: H04R

Claim Text:
1. A double backplate microphone, comprising a micro-electro-mechanical system (MEMS) chip, an amplifier with an single-ended input port, a first backplate, electrically connected to the single-ended input port, a second backplate electrically connected to ground, a membrane, arranged between the first and the second backplate, a first resistive element having a resistance >=1 GΩ and electrically connected to the first backplate, a second resistive element having a resistance >=1 GΩ and electrically connected to the membrane, a first capacitance C a second capacitance C a parasitic capacitance Cp a parasitic capacitance Cm between the membrane and ground, a parasitic capacitance CP 4 pF<=Cm=C Cp Cp the first backplate, the membrane, and the second backplate are arranged on the MEMS-chip.