High signal to noise ratio capacitive sensing analog front-end
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United States of America Patent
Stats
-
Jul 12, 2016
Grant Date -
Mar 20, 2014
app pub date -
Dec 18, 2012
filing date -
Sep 14, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
First Claim
Other Claims data not available
Family
International Classification(s)
- 2012 Application Filing Year
- G06F Class
- 48051 Applications Filed
- 40472 Patents Issued To-Date
- 84.23 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 7 Citation Count
- G06F Class
- 11.69 % this patent is cited more than
- 9 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jan 12, 2028 |
