The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 19, 2019
Filed:
Feb. 26, 2018
Cirrus Logic International Semiconductor Ltd., Edinburgh, GB;
Paul Wilson, Linlithgow, GB;
Karthikeya Kodur, Edinburgh, GB;
Cirrus Logic, Inc., Austin, TX (US);
Abstract
This application relates to methods and apparatus for operating MEMS sensors, in particular MEMS capacitive sensors (C) such as a microphones. An amplifier apparatus () is arranged to amplify an input signal (V) received at a sense node () from the MEMS capacitive sensor. An antiphase signal generator () generates a second signal (V) which is in antiphase with the input signal (V) and an amplifier arrangement () is configured to receive the input signal (V) at a first input and the second signal (V) 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.