Method and circuit for automatic compensation of RFID resonance frequency statistics and temperature drift
A technology of temperature drift and resonance frequency, applied in the field of radio frequency identification, to achieve significant economic value, improve production efficiency and yield
Active Publication Date: 2022-05-17
EXCELIO TECH SHENZHEN
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Problems solved by technology
[0018] The purpose of the present invention is to solve the problem that the existing RFID resonant circuit drifts due to statistical factors and temperature factors, and proposes a method and circuit structure for automatic calibration and compensation for the drift, so as to improve the production efficiency and yield of products
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[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0041] First define several nouns used in this technical solution:
[0042] Peak Code – the binary code obtained after analog-to-digital conversion of the resonance amplitude;
[0043] Compensation code – the binary code composed of the switch control signal of the adjustable capacitor array, such as "1" when the switch is turned on, and "0" when the switch is turned off;
[0044] PTAT voltage - the voltage proportional to the absolute temperature (PTAT is P ropo...
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The invention belongs to the technical field of radio frequency identification, and specifically refers to a method and a circuit for automatically compensating RFID resonance frequency statistics and temperature drift. This application proposes a complete calibration compensation technology for the impact of statistical drift and temperature drift on resonance performance faced by radio frequency identification tag chip products. The automatic compensation for statistical drift saves a special The process of calibrating equipment greatly improves production efficiency and yield. This application also includes the automatic compensation technology for the temperature drift of the resonant circuit, using a variety of different implementation schemes for products with different refined logic control requirements, fundamentally solving the impact of temperature drift on the resonant frequency. The frequency calibration process after power-on reset proposed in this application clearly proposes control steps for implementing statistical drift and temperature drift compensation, and its guiding idea can be extended to a more general circuit compensation technology in the field of low-power wireless communication.
Description
technical field [0001] The invention belongs to the technical field of radio frequency identification, and specifically refers to a method for automatic calibration and compensation for the drift of the resonant frequency of a passive passive radio frequency identification tag (RFID) resonant circuit due to statistical factors and temperature factors, and realizes the method circuit. Background technique [0002] Radio frequency identification technology is one of the lowest core hardware technologies in the field of Internet of Things. The radio frequency identification tag chip made of radio frequency identification technology in the form of an integrated circuit using an integrated semiconductor manufacturing process is the basic component of the core technology in this field. The radio frequency identification tag chip is packaged in some form and connected with a number of peripheral devices to form the core circuit system of the radio frequency identification tag; the ...
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IPC IPC(8): H03B5/04H03B5/12
CPCH03B5/04H03B5/1265
Inventor 吴边
Owner EXCELIO TECH SHENZHEN