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Rfid system components implementing adjusted backscatter calculations and methodsRelated Patent Categories: Registers, Records, ConductiveRfid system components implementing adjusted backscatter calculations and methods description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080006702, Rfid system components implementing adjusted backscatter calculations and methods. Brief Patent Description - Full Patent Description - Patent Application Claims
Related Applications [0001] This application claims the benefit of U.S. Provisional Application Ser. No. 60/646,267 filed on Jan. 21, 2005, which is hereby claimed under 35 U.S.C. .sctn.119(e). The Provisional Application is incorporated herein by reference. FIELD OF THE INVENTION [0002] The present invention relates to Radio Frequency IDentification (RFID) systems, and more particularly, to an apparatus, a method, and a system of employing adjustments to backscatter calculations in RFID communication. BACKGROUND OF THE INVENTION [0003] Radio Frequency IDentification (RFID) systems typically include RFID tags and RFID readers (the latter are also known as RFID reader/writers or RFID interrogators). RFID systems can be used in many ways for locating and identifying objects to which the tags are attached. RFID systems are particularly useful in product-related and service-related industries for tracking large numbers of objects being processed, inventoried, or handled. In such cases, an RFID tag is usually attached to an individual item, or to its package. [0004] In principle, RFID techniques entail using an RFID reader to interrogate one or more RFID tags. The reader transmitting a Radio Frequency (RF) wave performs the interrogation. A tag that senses the interrogating RF wave responds by transmitting back another RF wave. The tag generates the transmitted back RF wave either originally, or by reflecting back a portion of the interrogating RF wave in a process known as backscatter. Backscatter may take place in a number of ways. [0005] The reflected back RF wave may further encode data stored internally in the tag, such as a number. The response is demodulated and decoded by the reader, which thereby identifies, counts, or otherwise interacts with the associated item. The decoded data can denote a serial number, a price, a date, a destination, other attribute(s), any combination of attributes, and so on. [0006] An RFID tag typically includes an antenna system, a power management section, a radio section, and frequently a logical section, a memory, or both. In earlier RFID tags, the power management section included a power storage device, such as a battery. RFID tags with a power storage device are known as active tags. Advances in semiconductor technology have miniaturized the electronics so much that an RFID tag can be powered solely by the RF signal it receives. Such RFID tags do not include a power storage device, and are called passive tags. BRIEF DESCRIPTION OF THE DRAWINGS [0007] FIG. 1 illustrates a typical RFID system with an RFID reader and an RFID tag; [0008] FIG. 2 is a diagram of an RFID tag such as the RFID tag shown in FIG. 1; [0009] FIG. 3 is a conceptual diagram for explaining a half-duplex mode of communication between the components of the RFID system of FIG. 1; [0010] FIG. 4 is a block diagram illustrating one embodiment of an electrical circuit that may be employed in an RFID tag such as the RFID tag of FIG. 1; [0011] FIGS. 5A and 5B illustrate two versions of the electrical circuit of FIG. 4 emphasizing signal flow in receive and transmit operational modes of the RFID tag, respectively; [0012] FIG. 6 illustrates one embodiment of a partial block diagram of the integrated circuit shown in FIG. 2; [0013] FIG. 7 is a conceptual diagram for explaining prior art communication from an RFID reader; [0014] FIG. 8 is a conceptual diagram for explaining prior art method of determining a backscatter parameter; [0015] FIG. 9 illustrates a prior art determination of TRCAL.NO from a reader waveform; [0016] FIG. 10 illustrates a prior art dividing technique using right-shifting; [0017] FIG. 11 illustrates results of the dividing technique of FIG. 10; [0018] FIG. 12 illustrates error in determining the backscatter parameter using the dividing technique of FIG. 10; [0019] FIG. 13 is a block diagram of a processing circuit of an embodiment of the invention; [0020] FIG. 14 illustrates error in determining the backscatter parameter using the processing circuitry of FIG. 13; Continue reading about Rfid system components implementing adjusted backscatter calculations and methods... 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