公开(公告)号：US10481121B2

公开(公告)日：2019-11-19

申请号：US15904737

申请日：2018-02-26

申请人： Cirrus Logic International Semiconductor Ltd.

发明人： Paul Wilson ,  Karthikeya Kodur

IPC分类号： H03F3/45 ,  G01N27/22 ,  G01D5/241 ,  H03F3/187 ,  H04R19/00 ,  G01D5/24 ,  H04R3/06

摘要： This application relates to methods and apparatus for operating MEMS sensors, in particular MEMS capacitive sensors (CMEMS) such as a microphones. An amplifier apparatus (300) is arranged to amplify an input signal (VINP) received at a sense node (104) from the MEMS capacitive sensor. An antiphase signal generator (201; 304) generates a second signal (VINN) which is in antiphase with the input signal (VINP) and an amplifier arrangement (105; 305) is configured to receive the input signal (VINP) at a first input and the second signal (VINN) at a second input and to output corresponding amplified first and second output signals. This converts a single ended input signal effectively into a differential input signal.

公开(公告)号：US10712304B2

公开(公告)日：2020-07-14

申请号：US16567727

申请日：2019-09-11

申请人： Cirrus Logic International Semiconductor Ltd.

发明人： Paul Wilson ,  Karthikeya Kodur

IPC分类号： H03F13/00 ,  G01N27/22 ,  H03F3/45 ,  H03F3/187 ,  H04R19/00 ,  G01D5/24 ,  H04R3/06 ,  G01D5/241

摘要： This application relates to methods and apparatus for operating MEMS sensors, in particular MEMS capacitive sensors (CMEMS) such as a microphones. An amplifier apparatus is arranged to amplify an input signal (VINP) received at a sense node from the MEMS capacitive sensor. An antiphase signal generator generates a second signal (VINN) which is in antiphase with the input signal (VINP) and an amplifier arrangement is configured to receive the input signal (VINP) at a first input and the second signal (VINN) at a second input and to output corresponding amplified first and second output signals. This converts a single ended input signal effectively into a differential input signal.