Capacitive Touch Sensor Control Unit With Automatic Gain Control
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United States of America Patent
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Issued Date -
Dec 25, 2014
app pub date -
Jun 21, 2013
filing date -
Jun 21, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In one embodiment, a touch sensor having automatically adjustable gain control includes an amplifier coupled to a first sense line of a touch sensor. The amplifier receives a signal from the first sense line and scales the signal by an amount of gain. An analog-to-digital (ADC) converter receives the signal from the amplifier and converts the signal from an analog signal to a first digital signal. A processor receives the first digital signal from the ADC and, without user input, automatically calculates the amount of gain for scaling the signal based on the received first digital signal. A feedback loop transmits the amount of gain to the amplifier for applying the amount of gain to the signal.
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