RFID interrogator having customized radio parameters with local memory storage
First Claim
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1. An apparatus for interrogating an RFID tag, comprising:
- a radio adapted to communicate RF signals with said RFID tag, said radio including a receiver portion and a transmitter portion, said transmitter portion having an amplifier subsystem adapted to be operated in a saturated gain state;
a processor operatively coupled to said radio and providing control signals defining operational parameters of said radio; and
a memory accessible by said processor and containing at least one data value used to set said operational parameters, said at least one data value comprising an optimal setting of said amplifier subsystem selected to achieve said saturated gain state upon initialization of said radio.
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Abstract
An RFID interrogator has a receiver/transmitter architecture that accounts for the variation in tolerances of radio system electrical components. The RFID interrogator includes a memory in which is stored desired initial condition data of the receiver/transmitter architecture, and this initial condition data is used upon initialization of the RFID interrogator to define the operational condition of the RFID interrogator. Each individual RFID interrogator may contain unique initial condition data corresponding to the particular component tolerances of that radio system.
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Citations
18 Claims
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1. An apparatus for interrogating an RFID tag, comprising:
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a radio adapted to communicate RF signals with said RFID tag, said radio including a receiver portion and a transmitter portion, said transmitter portion having an amplifier subsystem adapted to be operated in a saturated gain state; a processor operatively coupled to said radio and providing control signals defining operational parameters of said radio; and a memory accessible by said processor and containing at least one data value used to set said operational parameters, said at least one data value comprising an optimal setting of said amplifier subsystem selected to achieve said saturated gain state upon initialization of said radio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. In an apparatus for interrogating an RFID tag comprising a radio for communicating RF signals and having an amplifier, and a processor operatively coupled to said radio and providing control signals defining operational parameters of said amplifier, a method for setting said operational parameters comprises:
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determining a bias condition of said amplifier sufficient to achieve a saturated output power level for said amplifier; recording a value of at least one digital potentiometer of said processor corresponding to said determined bias condition; and generating said control signals using said recorded digital potentiometer value. - View Dependent Claims (12, 13, 14, 15, 16)
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17. In an apparatus for interrogating an RFID tag comprising a radio for communicating RF signals and having an amplifier, and a processor operatively coupled to said radio and providing control signals defining operational parameters of said amplifier, a method for setting said operational parameters comprises:
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determining a bias condition of said amplifier sufficient to achieve a saturated output power level for said amplifier; recording a value of at least one digital potentiometer of said processor corresponding to said determined bias condition, wherein said recording step further comprises recording said at least one digital potentiometer value in a non-volatile memory; generating said control signals using said recorded digital potentiometer value; allocating said memory into a plurality of memory blocks with at least one of said plurality of memory blocks including a cyclic redundancy code (CRC); and reserving at least one of said plurality of memory blocks for said at least one digital potentiometer value.
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18. In an apparatus for interrogating an RFID tag comprising a radio for communicating RF signals and having an amplifier, and a processor operatively coupled to said radio and providing control signals defining operational parameters of said amplifier, a method for setting said operational parameters comprises:
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determining a bias condition of said amplifier sufficient to achieve a saturated output power level for said amplifier; recording a value of at least one digital potentiometer of said processor corresponding to said determined bias condition wherein said recording step further comprises recording said at least one digital potentiometer value in a non-volatile memory; generating said control signals using said recorded digital potentiometer value; and wherein said generating step further comprises retrieving said at least one digital potentiometer value from said non-volatile memory during an initialization of said apparatus.
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Specification