Measurement and reporting of received signal strength in NFC enabled devices
First Claim
1. An NFC-enabled mobile device, comprising:
- a field detector circuit configured to detect an NFC reader field based on a current induced within an antenna of the NFC-enabled mobile device;
a receiver circuit configured to wake from a powered-down state in response to detection of the NFC reader field by the field detector circuit, the receiver circuit further configured to generate in-phase (I) and quadrature (Q) components of an incoming signal received from the NFC reader field;
first circuitry configured to determine a strength of the incoming signal received from the NFC reader field based on the I and Q components generated;
second circuitry configured to generate information representative of the determined strength at a first time; and
third circuitry configured to generate a first user perceivable output representative of the determined strength of the incoming signal, the first user perceivable output configured to direct a user to improve the strength of the incoming signal.
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Accused Products
Abstract
An NFC-enabled device including tag emulation circuitry and reader emulation circuitry operates so as to provide a signal strength meter function. The signal strength meter function, in tag emulation mode, measures and reports on how well the tag is coupled to a third party reader field. In reader emulation mode, the signal strength meter function measures and reports how well the reader of the NFC-enabled device couples to a tag that is being read. One exemplary method includes detecting an NFC reader field, operating reader receiver circuitry at the NFC-enabled device so as to at least determine the strength of a signal received from the reader field, generating information representative of the determined strength of the signal received from the reader field at a first time, and performing one or more predetermined actions based at least in part on the one or more signals representative of the determined strength. Predetermined actions may include generating visual, audio, and/or other indications of the received signal strength.
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Citations
19 Claims
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1. An NFC-enabled mobile device, comprising:
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a field detector circuit configured to detect an NFC reader field based on a current induced within an antenna of the NFC-enabled mobile device; a receiver circuit configured to wake from a powered-down state in response to detection of the NFC reader field by the field detector circuit, the receiver circuit further configured to generate in-phase (I) and quadrature (Q) components of an incoming signal received from the NFC reader field; first circuitry configured to determine a strength of the incoming signal received from the NFC reader field based on the I and Q components generated; second circuitry configured to generate information representative of the determined strength at a first time; and third circuitry configured to generate a first user perceivable output representative of the determined strength of the incoming signal, the first user perceivable output configured to direct a user to improve the strength of the incoming signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An NFC-enabled computational platform, comprising:
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a first circuit configured to detect a current induced by an NFC reader field in an NFC antenna of the NFC-enabled computational platform, wherein the current represents a measure of coupling between the NFC reader field and a tag; a reader receiver configured to a measure of the current in the NFC antenna and to receive in-phase (I) and quadrature (Q) versions of a signal in the NFC antenna; a second circuit configured to generate a signal indicative of the coupling between the NFC reader field and the tag based on levels of the I and Q components of the signal; and a third circuit configured to produce a user perceivable output based on the signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An NFC-enabled mobile device, comprising:
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a field detector circuit configured to detect an NFC reader field based on a current induced within an antenna of the NFC-enabled mobile device; a receiver circuit configured to wake from a powered-down state in response to detection of the NFC reader field by the field detector, the receiver circuit further configured to generate in-phase (I) and quadrature (Q) components of an incoming signal received from the NFC reader field; first circuitry configured to determine a strength of the incoming signal received from the NFC reader field based on the I and Q components generated; second circuitry configured to generate information representative of the determined strength at a first time; and third circuitry configured to generate a first user perceivable output representative of the determined signal strength, the first user perceivable output configured to direct a user to improve the strength of the signal received; wherein the field detector includes a shunt regulator.
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Specification