公开(公告)号：US08836359B2

公开(公告)日：2014-09-16

申请号：US13144036

申请日：2010-01-12

Applicant: Mathias Krauss ,  Sam Koblenski

Inventor： Mathias Krauss ,  Sam Koblenski

IPC: G01R31/3187 ,  H03M1/10 ,  H03M1/12

CPC classification number: H03M1/109 ,  H03M1/12

Abstract: Method and system are provided for evaluating linearity of a capacitive-to-digital converter (CDC) of a capacitive sensor integrated circuit chip. The evaluating employs multiple test capacitors, which may be on-chip with the CDC, and includes: obtaining capacitance values for the multiple test capacitors and parasitic capacitances of a first input A and a second input B to the capacitive-to-digital converter; applying the multiple test capacitors in multiple permutations to the first input A and the second input B, and for each of at least some permutations, determining an error between an expected output of the CDC using the obtained capacitance values and an actual measured output of the CDC; and determining linearity error for the CDC using the determined errors for the permutations of applying the multiple test capacitors to the first input A and the second input B of the CDC.

Abstract translation: 提供了用于评估电容式传感器集成电路芯片的电容 - 数字转换器（CDC）的线性度的方法和系统。 该评估采用多个测试电容器，其可以与CDC在芯片上，并且包括：获得多个测试电容器的电容值和第一输入端A和第二输入端B到电容 - 数字转换器的寄生电容; 将多个测试电容器以多个排列施加到第一输入端A和第二输入端B，并且对于至少一些排列中的每一个，使用所获得的电容值确定CDC的期望输出之间的误差和 CDC; 以及使用所确定的用于将多个测试电容器施加到CDC的第一输入A和第二输入B的排列的误差来确定CDC的线性误差。

公开(公告)号：US20120098557A1

公开(公告)日：2012-04-26

申请号：US13144036

申请日：2010-01-12

Applicant: Mathias Krauss ,  Sam Koblenski

Inventor： Mathias Krauss ,  Sam Koblenski

IPC: G01R31/3187

CPC classification number: H03M1/109 ,  H03M1/12

Abstract: Method and system are provided for evaluating linearity of a capacitive-to-digital converter (CDC) of a capacitive sensor integrated circuit chip. The evaluating employs multiple test capacitors, which may be on-chip with the CDC, and includes: obtaining capacitance values for the multiple test capacitors and parasitic capacitances of a first input A and a second input B to the capacitive-to-digital converter; applying the multiple test capacitors in multiple permutations to the first input A and the second input B, and for each of at least some permutations, determining an error between an expected output of the CDC using the obtained capacitance values and an actual measured output of the CDC; and determining linearity error for the CDC using the determined errors for the permutations of applying the multiple test capacitors to the first input A and the second input B of the CDC.

Abstract translation: 提供了用于评估电容式传感器集成电路芯片的电容 - 数字转换器（CDC）的线性度的方法和系统。 该评估采用多个测试电容器，其可以与CDC在芯片上，并且包括：获得多个测试电容器的电容值和第一输入端A和第二输入端B到电容 - 数字转换器的寄生电容; 将多个测试电容器以多个排列施加到第一输入端A和第二输入端B，并且对于至少一些排列中的每一个，使用所获得的电容值确定CDC的期望输出之间的误差和 CDC; 以及使用所确定的用于将多个测试电容器施加到CDC的第一输入A和第二输入B的排列的误差来确定CDC的线性误差。