Capacitive sensing array having electrical isolation
First Claim
1. An electronic device, comprising:
- a sensor chip comprising an array of individual capacitive sensing elements;
an antenna electronic component positioned within the electronic device; and
an electrical isolation wall electrically separating the sensor chip and the antenna, wherein;
the electrical isolation wall filters high frequency signals from traveling between the antenna and the sensor chip, and comprises a first inductor in series with a voltage supply of the sensor chip and a second inductor in series with a ground reference of the sensor chip.
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Accused Products
Abstract
A capacitive fingerprint sensor that may be formed of an array of sensing elements. Each capacitive sensing element of the array may register a voltage that varies with the capacitance of a capacitive coupling. A finger may capacitively couple to the individual capacitive sensing elements of the sensor, such that the sensor may sense a capacitance between each capacitive sensing element and the flesh of the fingerprint. The capacitance signal may be detected by sensing the change in voltage on the capacitive sensing element as the relative voltage between the finger and the sensing chip is changed. Alternately, the capacitance signal may be detected by sensing the change in charge received by the capacitive sensing elements as the relative voltage between the finger and the sensing chip is changed.
168 Citations
21 Claims
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1. An electronic device, comprising:
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a sensor chip comprising an array of individual capacitive sensing elements; an antenna electronic component positioned within the electronic device; and an electrical isolation wall electrically separating the sensor chip and the antenna, wherein; the electrical isolation wall filters high frequency signals from traveling between the antenna and the sensor chip, and comprises a first inductor in series with a voltage supply of the sensor chip and a second inductor in series with a ground reference of the sensor chip. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An electronic device, comprising:
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a housing; an antenna at least partially within the housing; an input element separate from the housing; a sensor positioned beneath the input element; a controller chip electrically connected to the sensor; and an electrical isolation element electrically isolating the antenna from the sensor, the electrical isolation element comprising; a first inductor in series with a voltage supply of the sensor; and a second inductor in series with a ground reference of the sensor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification