CAPACITIVE SENSOR INTERFERENCE DETERMINATION
First Claim
Patent Images
1. A method of determining interference in a capacitance sensor device, said method comprising:
- transmitting a signal on a transmitter sensor channel of said capacitive sensor;
receiving said signal on a receiver sensor channel of said capacitive sensor, wherein said receiver sensor channel is coupled with an amplifier; and
examining behavior of said amplifier for non-linearity to determine if a level of interference has been received by said receiver sensor channel in conjunction with receipt of said signal.
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Abstract
In a method of determining interference in a capacitance sensor, a signal is transmitted on a transmitter sensor channel of the capacitive sensor. The signal is received on a receiver sensor channel of the capacitive sensor, the receiver sensor channel being coupled with an amplifier. Behavior of the amplifier is examined for non-linearity to determine if a level of interference has been received by the receiver sensor channel in conjunction with receipt of the signal.
54 Citations
17 Claims
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1. A method of determining interference in a capacitance sensor device, said method comprising:
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transmitting a signal on a transmitter sensor channel of said capacitive sensor; receiving said signal on a receiver sensor channel of said capacitive sensor, wherein said receiver sensor channel is coupled with an amplifier; and examining behavior of said amplifier for non-linearity to determine if a level of interference has been received by said receiver sensor channel in conjunction with receipt of said signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A capacitive sensor interference determining circuit, said circuit comprising:
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an amplifier configured with a first input for receiving a signal from a receiver sensor channel of a capacitive sensor and a second input for a reference voltage; a current differential amplifier coupled with said amplifier, said current differential amplifier configured to output two differential currents representing differentials of currents utilized in said amplifier; and a current comparator coupled with said differential amplifier, said current comparator configured to compare said two differential currents to two reference currents to determine whether a non-linearity condition exists in said amplifier. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of fabricating an interference determining processor system for a capacitive sensor device, said method comprising:
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coupling an amplifier with a receiver sensor channel of said processor system, said amplifier configured with a first input for receiving a signal from said receiver sensor channel and a second input for a reference voltage; coupling a current differential amplifier with an output of said amplifier, said current differential amplifier configured to output two differential currents representing differentials of currents utilized in said amplifier; and coupling a current comparator with said current differential amplifier, said current comparator configured to compare said two differential currents to two reference currents to determine whether a non-linearity exists in said amplifier. - View Dependent Claims (14, 15, 16, 17)
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Specification