Transponder and method for wireless data transmission
First Claim
1. A transponder comprising:
- a circuit comprising two antenna terminals coupled to respective ends of an antenna coil for receiving data by inductive coupling;
a resistor coupled in series with a switch between the terminals; and
a controller configured to;
couple the terminals to the resistor through the switch when detecting that a voltage applied at the terminals falls below a first threshold value; and
decouple the terminals from the resistor through the switch when detecting that the voltage applied at the terminals is higher than a second threshold value for a duration.
19 Assignments
0 Petitions
Accused Products
Abstract
A transponder and a method for wireless data transmission is provided. The transponder comprises an input circuit with input terminals for connecting an antenna coil for data transmission to a base station by means of inductive coupling, a first controllable switching means, at least one resistor, which is looped in series with the first controllable switching means between the input terminals of the input circuit, and a controller which is designed in such a way that it connects through the first switching means as soon as a voltage applied at the input terminals falls below a first settable threshold value, and again interrupts it as soon as the voltage applied at the input terminals for a settable duration is above the first settable threshold value and/or above a second settable threshold value.
15 Citations
20 Claims
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1. A transponder comprising:
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a circuit comprising two antenna terminals coupled to respective ends of an antenna coil for receiving data by inductive coupling; a resistor coupled in series with a switch between the terminals; and a controller configured to; couple the terminals to the resistor through the switch when detecting that a voltage applied at the terminals falls below a first threshold value; and decouple the terminals from the resistor through the switch when detecting that the voltage applied at the terminals is higher than a second threshold value for a duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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interfacing, by a transponder, with a base station through inductive coupling to receive data, the transponder comprising a circuit with two antenna terminals coupled to respective ends of an antenna coil and a resistor coupled in series with a switch between the terminals; and coupling, when detecting that a voltage applied at the terminals falls below a first threshold value, the terminals to the resistor through the switch; decoupling, when detecting that the voltage applied at the terminals is higher than a second threshold value for a duration, the terminals from the resistor through the switch. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A device comprising:
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a circuit comprising two antenna terminals coupled to respective ends of an antenna coil for receiving data by inductive coupling; a rectifier coupled to the terminals configured to generate a signal based on a voltage applied at the terminals; a signal-processing unit configured to detect a field gap based on the signal from the rectifier; a resistor coupled in series with a switch between the terminals; and a controller configured to; couple the terminals to the resistor through the switch when detecting, based on the generated signal, that the voltage applied at the terminals falls below a first threshold value; and decouple the terminals from the resistor through the switch when detecting that the voltage applied at the terminals is higher than a second threshold value for a duration. - View Dependent Claims (17, 18, 19, 20)
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Specification