Invention Grant
US07948244B2 Capacitive sensors including gain and active-filtered sampling stages
有权
电容式传感器包括增益和有源滤波采样级
- Patent Title: Capacitive sensors including gain and active-filtered sampling stages
- Patent Title (中): 电容式传感器包括增益和有源滤波采样级
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Application No.: US12507497Application Date: 2009-07-22
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Publication No.: US07948244B2Publication Date: 2011-05-24
- Inventor: Dejan Mijuskovic , Liviu Chiaburu
- Applicant: Dejan Mijuskovic , Liviu Chiaburu
- Applicant Address: US TX Austin
- Assignee: Freescale Semiconductor, Inc.
- Current Assignee: Freescale Semiconductor, Inc.
- Current Assignee Address: US TX Austin
- Agency: Ingrassia Fisher & Lorenz, P.C.
- Main IPC: G01R27/26
- IPC: G01R27/26 ; H03K5/08

Abstract:
Embodiments of capacitive sensors (500, 600) and methods for reducing noise in capacitive sensors are provided. Embodiments of capacitive sensors include a gain stage (510, 610), a capacitive sensor output, and an active filtered-sampling stage (550, 650). The an active filtered-sampling stage includes a first resistive element (555, 655) coupled to the gain stage output, a second resistive element (565, 670) coupled to the capacitive sensor output, a node (560, 660) between the first and second resistive elements, and a switch (575, 675) selectively coupling the first node to an integrator circuit (550, 650), where the integrator circuit is coupled to the capacitive sensor output.
Public/Granted literature
- US20090278551A1 CAPACITIVE SENSORS AND METHODS FOR REDUCING NOISE THEREIN Public/Granted day:2009-11-12
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