公开(公告)号：US20190326868A1

公开(公告)日：2019-10-24

申请号：US16393363

申请日：2019-04-24

Applicant: Silicon Integrated Systems Corp

Inventor： Wen-Chi LIN ,  Ssu-Che YANG ,  Keng-Nan CHEN

IPC: H03G3/30 ,  H03F3/45 ,  H04R3/00

Abstract: An analog microphone and a control method thereof are disclosed. The analog microphone includes a sensor configured to sense an audio signal and convert the audio signal into an electrical signal; a charge pump configured to provide a bias voltage for the sensor to drive the sensor; a source follower configured to receive the electrical signal and convert the electrical signal into a source follower signal; a gain adjustable amplifier configured to receive the source follower signal, multiply the source follower signal by an amplifying factor, and output an amplified signal; and a detecting module configured to adaptively control the bias voltage of the charge pump and the amplified signal of the gain adjustable amplifier in response to the source follower signal of the source follower.

公开(公告)号：US20180127264A1

公开(公告)日：2018-05-10

申请号：US15668844

申请日：2017-08-04

Applicant: SILICON INTEGRATED SYSTEMS CORP.

Inventor： Ssu-Che YANG ,  Wen-Chi LIN ,  Keng-Nan CHEN

IPC: B81B7/00 ,  G01R17/04

CPC classification number: B81B7/008 ,  B81B2201/02 ,  G01R17/04 ,  H02M3/07 ,  H04R3/04 ,  H04R2201/003 ,  H04R2410/00

Abstract: A sensing device includes a micro-electromechanical sensor, a source follower and an amplifier. The source follower includes a first output module including a first transistor and a second transistor. The micro-electromechanical sensor is configured to generate an input signal. A first terminal of the first transistor is configured to receive a first reference voltage. A second terminal and a control of the first transistor are electrically connected to the first output terminal and to a first current source respectively. A first terminal and a second terminal of the second transistor are electrically connected to the second terminal and the control terminal of the first transistor respectively. A control terminal of the second transistor is configured to receive the input signal. A first input terminal and a second input terminal of the amplifier are electrically connected to a first output terminal configured to receive a common-mode voltage respectively.