Invention Grant
- Patent Title: High signal to noise ratio capacitive sensing analog front-end
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Application No.: US13717780Application Date: 2012-12-18
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Publication No.: US09389256B2Publication Date: 2016-07-12
- Inventor: Paolo Angelini , Giovanni Carlo Tripoli , Ernesto Lasalandra , Tommaso Ungaretti , Kien Beng Tan , Yannick Guedon , Dianbo Guo , Sze-Kwang Tan
- Applicant: STMicroelectronics Asia Pacific Pte. Ltd. , STMicroelectronics S.r.l.
- Applicant Address: SG Singapore IT Agrate Brianza (MI)
- Assignee: STMicroelectronics Asia Pacific Pte Ltd,STMicroelectronics S.r.l.
- Current Assignee: STMicroelectronics Asia Pacific Pte Ltd,STMicroelectronics S.r.l.
- Current Assignee Address: SG Singapore IT Agrate Brianza (MI)
- Agency: Gardere Wynne Sewell LLP
- Main IPC: G06F3/044
- IPC: G06F3/044 ; G01R27/26 ; G06F3/041

Abstract:
Capacitance sensing circuits and methods are provided. The capacitance sensing circuit includes a capacitance-to-voltage converter configured to receive a signal from a capacitance to be sensed and to provide an output signal representative of the capacitance, an output chopper configured to convert the output signal of the capacitance-to-voltage converter to a sensed voltage representative of the capacitance to be sensed, an analog accumulator configured to accumulate sensed voltages during an accumulation period of NA sensing cycles and to provide an accumulated analog value, an amplifier configured to amplify the accumulated analog value, and an analog-to-digital converter configured to convert the amplified accumulated analog value to a digital value representative of the capacitance to be sensed. The analog accumulator may include a low pass filter having a frequency response to filter wideband noise.
Public/Granted literature
- US20140077823A1 HIGH SIGNAL TO NOISE RATIO CAPACITIVE SENSING ANALOG FRONT-END Public/Granted day:2014-03-20
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