Invention Grant
- Patent Title: Circuit and method for sensing a capacitance
- Patent Title (中): 用于感测电容的电路和方法
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Application No.: US13316273Application Date: 2011-12-09
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Publication No.: US09075486B2Publication Date: 2015-07-07
- Inventor: Chun-Chung Huang , I-Shu Lee , Shih-Yuan Hsu , Te-Sheng Chiu
- Applicant: Chun-Chung Huang , I-Shu Lee , Shih-Yuan Hsu , Te-Sheng Chiu
- Applicant Address: TW Hsinchu
- Assignee: ELAN MICROELECTRONICS CORPORATION
- Current Assignee: ELAN MICROELECTRONICS CORPORATION
- Current Assignee Address: TW Hsinchu
- Agency: Muncy, Geissler, Olds & Lowe, P.C.
- Priority: TW99143211A 20101210
- Main IPC: G01R27/26
- IPC: G01R27/26 ; G06F3/041 ; G06F3/045 ; G06F3/044 ; G01D5/24
Abstract:
A transconductance amplifier mirror circuit is connected to an electrode for sensing the capacitance of the electrode with reference to ground, or the capacitance between the electrode and another electrode. A voltage level change is produced on the electrode connected to the transconductance amplifier mirror circuit to cause the transconductance amplifier mirror circuit to supply charges to or drain charges from a charge calculation circuit. The charge amount variation is converted to a signal for calculating the sensed capacitance.
Public/Granted literature
- US20120146726A1 CIRCUIT AND METHOD FOR SENSING A CAPACITANCE Public/Granted day:2012-06-14
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