Circuit arrangement for wirelessly exchanging data and RFID chip card device
First Claim
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1. A circuit arrangement for wirelessly exchanging data with a reader device, comprising:
- an antenna configured to convert electromagnetic radiation into an antenna voltage;
an analogue circuit configured to demodulate an information signal based on the antenna voltage, the analogue circuit comprising an adjustable shunt;
a digital circuit configured to process the information signal and receive power from the analogue circuit;
a decoupling circuit interconnected between the analogue circuit and the digital circuit; and
a feedback circuit, which is connected to the decoupling circuit and the adjustable shunt, configured to detect an amplitude modulation of the antenna voltage, wherein the feedback circuit controls the adjustable shunt in response to a detected modulation of the antenna voltage.
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Abstract
A circuit arrangement for wirelessly exchanging data with a reader device, including an antenna for converting electromagnetic radiation into an antenna voltage, an analogue circuit for demodulating an information signal based on the antenna voltage, and a digital circuit for processing of the information signal and for receiving power from the analogue circuit. The circuit arrangement also includes a decoupling circuit, which is interconnected between the analogue circuit and the digital circuit and provides a decoupling of both circuits.
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Citations
25 Claims
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1. A circuit arrangement for wirelessly exchanging data with a reader device, comprising:
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an antenna configured to convert electromagnetic radiation into an antenna voltage; an analogue circuit configured to demodulate an information signal based on the antenna voltage, the analogue circuit comprising an adjustable shunt; a digital circuit configured to process the information signal and receive power from the analogue circuit; a decoupling circuit interconnected between the analogue circuit and the digital circuit; and a feedback circuit, which is connected to the decoupling circuit and the adjustable shunt, configured to detect an amplitude modulation of the antenna voltage, wherein the feedback circuit controls the adjustable shunt in response to a detected modulation of the antenna voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A circuit arrangement for wirelessly exchanging data with a reader device, comprising:
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an antenna configured to convert electromagnetic radiation into an antenna voltage; an analogue circuit configured to demodulate an information signal based on the antenna voltage; a digital circuit configured to process the information signal and receive power from the analogue circuit; a decoupling circuit interconnected between the analogue circuit and the digital circuit; and a control circuit configured to monitor a parameter characterizing the field strength of an electromagnetic field surrounding the antenna and adjust an input current of the decoupling circuit based on the monitored parameter. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A circuit arrangement for wirelessly exchanging data with a reading means, comprising:
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a conversion means for converting electromagnetic radiation into an antenna voltage; a demodulation means for demodulating an information signal based on the antenna voltage; an adjustable shunting means for shunting a current caused by the antenna voltage; a processing means for processing of the information signal; an interconnection means for supplying power from the conversion means to the processing means and for decoupling the conversion means from the processing means; and a feedback means for detecting an amplitude modulation of the antenna voltage and for controlling the adjustable shunting means in response to a detected modulation of the antenna voltage.
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19. A circuit arrangement for wirelessly exchanging data with a reading means, comprising:
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an conversion means for converting electromagnetic radiation into an antenna voltage; a demodulation means for demodulating an information signal based on the antenna voltage; a processing means for processing the information signal; an interconnection means for supplying power from the conversion means to the processing means and for decoupling the conversion means from the processing means; and a control means for monitoring a parameter characterizing the field strength of an electromagnetic field surrounding the conversion means and for adjusting an input current of the interconnection means based on the monitored parameter. - View Dependent Claims (20)
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21. An RFID chip card device for wirelessly exchanging data with a RFID reader device, comprising:
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an antenna configured to convert electromagnetic radiation into an antenna voltage; an analogue circuit configured to demodulate an information signal based on the antenna voltage, the analogue circuit comprising an adjustable shunt; a digital circuit configured to process the information signal and receive power from the analogue circuit; a decoupling circuit interconnected between the analogue circuit and the digital circuit; and a feedback circuit, which is connected to the decoupling circuit and the adjustable shunt, is configured to detect an amplitude modulation of the antenna voltage, wherein the feedback circuit is configured to control the adjustable shunt in response to a detected modulation of the antenna voltage. - View Dependent Claims (22, 23)
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24. An RFID chip card device for wirelessly exchanging data with an RFID reader device, comprising:
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an antenna configured to convert electromagnetic radiation into an antenna voltage; an analogue circuit configured to demodulate an information signal based on the antenna voltage; a digital circuit configured to process the information signal and receive power from the analogue circuit; a decoupling circuit interconnected between the analogue circuit and the digital circuit; and a control circuit configured to monitor a parameter characterizing the field strength of an electromagnetic field surrounding the antenna and adjust an input current of the decoupling circuit based on the monitored parameter. - View Dependent Claims (25)
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Specification