Split signal differential MEMS microphone
US10153740B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 11, 2016 |
| Grant date | Dec 11, 2018 |
| Priority date | — |
| Expiry date | Jul 12, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/11
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A microphone assembly includes a capacitive MEMS transducer and a bias circuit having a DC output coupled to the transducer. The microphone assembly also includes a differential amplifier having a first input coupled to a first output of the transducer, the differential amplifier having a second input coupled to a second output of the transducer. The microphone assembly further includes a first impedance matching network and a second impedance matching network configured to balance a first capacitive load at the first input of the amplifier and a second capacitive load at the second input of the amplifier. Electrical signals applied by the transducer to the first and second inputs of the amplifier are matched or approximately matched in magnitude and 180 degrees or approximately 180 degrees out of phase with respect to each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.