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:
Feb. 15, 2022
Filed:
Oct. 28, 2020
Atlantic Inertial Systems Uk, Plymouth, GB;
Christopher Paul Fell, Cheltenham, GB;
Kevin Townsend, Liskeard, GB;
ATLANTIC INERTIAL SYSTEMS UK, Plymouth, GB;
Abstract
A method for closed loop operation of a capacitive accelerometer includes applying a first drive signal Vto a first fixed capacitive electrode and a second drive signal Vto a second fixed capacitive electrode the first and second drive signals each having a periodic waveform varying in amplitude between zero and a maximum value Vand sensing a displacement of the proof mass and applying pulse width modulation to the first and second drive signals with a constant frequency fand a variable mark/space ratio. The method also includes applying a voltage offset V/2 to the proof mass and applying the pulse width modulation such that the first and second drive signals have a waveform that varies so that when either one of the first and second drive signals is at Vor zero the other drive voltage is at V/2.