公开(公告)号：US10250980B2

公开(公告)日：2019-04-02

申请号：US15729796

申请日：2017-10-11

Applicant: Fortemedia, Inc.

Inventor： Ion Opris ,  Abu Hena M Kamal ,  Lee Tay Chew ,  Ramesh Prakash ,  Shomo Chen ,  Qiang Wei ,  Lung-Chu Joseph Chen

IPC: H04R3/10 ,  H04R19/04 ,  H04R3/04 ,  H04R19/00 ,  B81B7/00 ,  B81B7/02 ,  H03F3/183 ,  H03G3/30

Abstract: A digital microphone is provided. The digital microphone includes an acoustic sensor, a bias generator, first and second attenuators, a buffer, an amplifier, an ADC, and a controller. The acoustic sensor transfers an acoustic signal to a voltage signal. The bias generator provides a bias voltage to the acoustic sensor. The first attenuator attenuates the voltage signal by a first attenuation value. The buffer buffers the voltage signal to generate a buffered voltage signal. The amplifier amplifies the buffered voltage signal to generate an amplified signal. The ADC converts the amplified signal to a data signal with a digital format. The second attenuator attenuates the data signal by a second attenuation value. The controller determines whether the amplified signal is larger than a reference value and adjusts the bias voltage and the first and second attenuation values of the first and second attenuators according to the result determined by the controller.

公开(公告)号：US10349161B2

公开(公告)日：2019-07-09

申请号：US15730836

申请日：2017-10-12

Applicant: Fortemedia, Inc.

Inventor： Ion Opris ,  Abu Hena M Kamal ,  Ramesh Prakash ,  Lee Tay Chew

IPC: A61F11/06 ,  H04R3/00 ,  H04R1/10 ,  G10K11/16 ,  H04R1/34 ,  B81B3/00 ,  B06B1/02 ,  B81B7/00 ,  H04R3/06 ,  H04R19/00 ,  H04R19/04

Abstract: A circuit for biasing a transducer including a first plate and a second plate includes a front-end buffer and a charge pump. The front-end buffer generates an internal signal at an internal node in response to a voltage signal of the second plate. The transducer receives the incident sound wave at the first plate to generate the voltage signal at the second plate. The charge pump boosts the internal signal into a boost voltage at the first plate according to a first clock signal.