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Method, system and apparatus for calibrating a pulse position modulation (PPM) decoder to a PPM signal

A pulse position modulation and decoder technology, applied in pulse position modulation, transmission systems, radio wave measurement systems, etc., can solve the problem of impossible to accurately decode PPM transmission symbols

Inactive Publication Date: 2003-01-01
MICROCHIP TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to differences in semiconductor manufacturing process, operating voltage and / or temperature, the frequency of the internal oscillator of the RFID tag device may vary within ±25%
If left uncorrected, the internal oscillator clock frequency of an RFID tag can vary so much that it will be impossible to accurately decode PPM transmitted symbols

Method used

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  • Method, system and apparatus for calibrating a pulse position modulation (PPM) decoder to a PPM signal
  • Method, system and apparatus for calibrating a pulse position modulation (PPM) decoder to a PPM signal
  • Method, system and apparatus for calibrating a pulse position modulation (PPM) decoder to a PPM signal

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Embodiment Construction

[0037] The present invention involves calculating the relative frequency relationship between an RFID tag's internal oscillator and an external PPM source, such as an RFID tag reader, and then calibrating the RFID tag's PPM decoder circuitry to the required frequency for reliable PPM symbol decoding. The accuracy of the circuit for RFID tagging devices. In an embodiment of the present invention, the PPM decoder is calibrated to an external PPM frequency source (i.e., RFID tag reading) done by a single-step measurement during one code intrusion calibration symbol period (hereinafter referred to as the calibration symbol period). oscillator) and the internal oscillator of the RFID tagging device.

[0038] Referring now to the drawings, there are schematically shown details of preferred embodiments of the invention. Identical elements in the drawings are represented by the same numbers and / or letters, and similar elements are represented by numbers and / or letters with different ...

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Abstract

A radio frequency identification (RFID) tag device having a pulse position modulation (PPM) decoder circuit which calculates a relative frequency relationship between an internal oscillator of the RFID tag device and an external PPM source such as a RFID tag reader. The PPM decoder circuit is calibrated to the difference between the external PPM frequency source (i.e., RFID tag reader) and the internal clock-oscillator of the RFID tag device, which is performed in a single measurement during one calibration symbol period.

Description

technical field [0001] This invention relates generally to radio frequency identification (RFID) tagging devices, and more particularly to radio frequency identification tagging devices that calibrate the timing of their decoders based on received pulse position modulation (PPM) signals within a calibration symbol interval. Background technique [0002] Radio frequency identification (RFID) tagging devices may be used in inventory management, automatic identification of cars on toll roads, security systems, electronic charge cards, keyless entry, and the like. Since RFID tagging devices can be read through paint, water, mud, dust, human bodies, concrete, or through the tagged item itself, RFID tagging devices will work in harsher environmental conditions than barcode labels. RFID tag devices are used with radio frequency tag readers (interrogators) that generate a continuous wave (CW) radio frequency (RF) or electromagnetic carrier wave at close range...

Claims

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Application Information

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IPC IPC(8): G01S13/78G01S13/76G06K19/07H04B14/02
CPCG01S13/76H04B14/026G06K19/0723H03K7/04
Inventor 塞缪尔·E·亚历山大斯蒂芬·R·洛耶
Owner MICROCHIP TECH INC