Compensation for holes in the read range of an RFID reader technical field
First Claim
1. A reader for an RFID system comprising:
- an antenna configured to receive a transponder data signal;
a receiver coupled to said antenna for generating a conditioned output signal from said transponder data signal; and
a controller coupled to said receiver for detecting amplitude of said conditioned output signal and controlling operation of said receiver as a function of said amplitude.
2 Assignments
0 Petitions
Accused Products
Abstract
A reader and a corresponding method are provided for processing transponder data signals received from a transponder in an RFID system. The reader includes an exciter which generates excitation signals, a receiver which conditions the transponder data signals, an antenna coupled to the exciter and receiver which transmits the excitation signals and receives the transponder data signals, and a controller coupled to the receiver. The controller receives the conditioned transponder data signals and demodulates the conditioned signals to extract the transponder data. The controller is configured to detect the amplitude of the conditioned signals and to control operation of the receiver as a function of the amplitude of the conditioned signals.
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Citations
25 Claims
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1. A reader for an RFID system comprising:
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an antenna configured to receive a transponder data signal;
a receiver coupled to said antenna for generating a conditioned output signal from said transponder data signal; and
a controller coupled to said receiver for detecting amplitude of said conditioned output signal and controlling operation of said receiver as a function of said amplitude. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A reader for an RFID system comprising:
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an antenna configured to receive a transponder data signal;
a receiver coupled to said antenna including a shift and clamp circuit for performing a shifting operation and a clamping operation on said transponder data signal; and
a controller coupled to said receiver for demodulating a receiver output signal to extract transponder data from said receiver output signal and further for detecting amplitude of said receiver output signal and controlling operation of said receiver in response to said amplitude. - View Dependent Claims (10, 11, 12, 13)
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14. A method for reading a transponder data signal comprising:
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receiving a transponder data signal containing transponder data on a reader antenna;
amplifying said transponder data signal to generate a conditioned amplifier output signal containing said transponder data;
attempting to extract said transponder data from said amplified output signal;
detecting an amplitude of said conditioned amplifier output signal;
comparing said amplitude to a predetermined threshold;
adjusting a level of gain performed during amplification of said transponder data signal when said amplitude is greater than said predetermined threshold such that said transponder data is not extractable from said conditioned amplifier output signal; and
demodulating said conditioned amplifier output signal to extract said transponder data from said conditioned amplifier output signal, thereby reading said transponder data signal. - View Dependent Claims (15, 16)
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17. A method for reading a transponder data signal comprising:
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receiving an antenna signal on a reader antenna, wherein said antenna signal includes a low voltage transponder data signal containing transponder data;
reducing voltage of said antenna signal to generate a voltage reduced signal containing said transponder data;
amplifying said voltage reduced signal to generate a conditioned amplifier output signal containing said transponder data;
attempting to extract said transponder data from said amplified output signal;
detecting an amplitude of said conditioned amplifier output signal;
comparing said amplitude to a predetermined threshold;
adjusting a level of voltage reduction of said antenna signal when said amplitude is greater than said predetermined threshold such that transponder data is not extractable from said conditioned amplifier output signal; and
demodulating said conditioned amplifier output signal to extract transponder data from said conditioned amplifier output signal, thereby reading said transponder data signal. - View Dependent Claims (18)
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19. A reader for an RFID system comprising:
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an antenna to receive a transponder data signal;
a receiver coupled to said antenna, said receiver including a voltage reduction circuit for receiving an antenna signal including said transponder data signal from said antenna and generating a voltage reduced signal, said receiver further including an amplifier coupled to said voltage reduction circuit for receiving said voltage reduced signal and generating a conditioned amplifier output signal; and
a controller coupled to said amplifier for demodulating said conditioned amplifier output signal, thereby reading said transponder data signal, wherein said controller detects said amplitude of said conditioned amplifier output signal and controls operation of said receiver as a function of said amplitude. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification