公开(公告)号：US20230396932A1

公开(公告)日：2023-12-07

申请号：US18203974

申请日：2023-05-31

申请人： Sennheiser electronic GmbH & Co. KG

发明人： Stephan Leschka ,  Wolfgang Dreßler

IPC分类号： H04R19/01 ,  H03K17/60 ,  H04R3/00

CPC分类号： H04R19/016 ,  H03K17/60 ,  H04R3/007

摘要： An electret microphone is provided, comprising a microphone capsule with an output connection, a first input connection as an earth connection and a second input connection for providing a supply voltage for the microphone capsule and for leading out a microphone output signal of the microphone capsule, and a cascode consisting of a first and second transistor. An output connection of the microphone capsule is provided as input of the cascode. The second transistor is configured as a field effect transistor FET and the gate connection thereof is coupled to the output connection of the microphone capsule. A drain connection of the second transistor is coupled to an emitter connection of the first transistor as bipolar transistor or to a source connection of the first transistor as an FET transistor. Furthermore, a third transistor is provided as bipolar transistor, whose emitter connection is coupled to the second input connection. A collector connection of the third transistor is coupled via a capacitor to earth. A base connection of the third transistor is coupled via a resistance to the second input connection. The base connection of the third transistor is coupled to a collector connection of the first transistor as bipolar transistor or to a drain connection of the first transistor as FET transistor. A resistance is coupled between the drain connection of the second transistor and the collector connection of the third transistor.