公开(公告)号：US20190011291A1

公开(公告)日：2019-01-10

申请号：US15926276

申请日：2018-03-20

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Vamsikrishna PARUPALLI ,  Zhong YOU ,  Gaurav AGARWAL ,  Vikrant ARUMUGAM ,  Johann G. GABORIAU ,  Nishant JAIN

IPC: G01D5/24 ,  G01R27/26 ,  H04L27/144 ,  G01R29/26

Abstract: A method for measuring a capacitive sensor output may include applying an excitation signal to a capacitor of the capacitive sensor which causes generation of a modulated signal from a baseband signal, wherein the excitation signal is of a carrier frequency which is higher than frequency content of the baseband signal, demodulating the modulated signal to generate an output signal representative of a capacitance of the capacitor wherein the demodulating is based, at least in part, on the excitation signal, determining whether noise in the modulated signal is caused by interference at approximately the carrier frequency, and in response to determining noise in the modulated signal is caused by interference at approximately the carrier frequency, modifying the carrier frequency to another frequency to reduce noise caused in the modulated signal by the interference.

公开(公告)号：US20230366747A1

公开(公告)日：2023-11-16

申请号：US18191733

申请日：2023-03-28

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Vamsikrishna PARUPALLI ,  Zhong YOU ,  Johann G. GABORIAU ,  Amar VELLANKI ,  Vikrant ARUMUGAM

IPC: G01K7/22 ,  H03M1/10

CPC classification number: G01K7/22 ,  H03M1/1014 ,  G01K2219/00

Abstract: A current digital-to-analog converter may be used in a system for measuring temperature of a thermistor, with mismatch reduction techniques applied to digital-to-analog converter elements of the digital-to-analog converter in order to maximize accuracy and precisions of the temperature measurement.