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:
Jan. 07, 2020
Filed:
Mar. 29, 2018
Cirrus Logic International Semiconductor Ltd., Edinburgh, GB;
Paul Wilson, Linlithgow, GB;
Cirrus Logic, Inc., Austin, TX (US);
Abstract
The present disclosure relates to a system comprising: a MEMS capacitive transducer comprising a first electrode and a second electrode; integrator circuitry; and test circuitry. The MEMS capacitive transducer forms part of a negative feedback path of the integrator circuitry, and the test circuitry is operable to selectively apply one or more current sources to an input of the integrator circuitry based on a signal at an output of the integrator so as to generate a periodic signal at the output of the integrator circuitry. A frequency of the periodic signal is at least partially dependent upon a capacitance of the MEMS capacitive transducer. The system is further operative to determine a parameter indicative of the frequency of the periodic signal and to estimate the capacitance of the MEMS capacitive transducer based on the parameter indicative of the frequency of the periodic signal.