Microphone e.g. micro-electromechanical system (MEMS) microphone for use in mobile communication apparatus, has membrane and back plate between which variable electrical bias is produced by bias generation unit

摘要

The microphone (M) has a membrane (MB), a back plate (RP) and a bias generation unit (MVV) for producing variable electrical bias (V) between the membrane and back plate. A control signal terminal is interconnected with the control circuit, so that the control signal of control circuit rests against the control signal terminal to control the bias. The control signal terminal is also interconnected with the membrane and back plate. The control circuit produces the control signal for measuring the sound pressure level in microphone.