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Clock dynamic calibration method and circuit based on UHF RFID chip

A technology of dynamic calibration and clock calibration, applied to logic circuits using specific components, logic circuits using basic logic circuit components, logic circuits, etc., to achieve the effects of low power consumption, small occupied chip area, and simple structure

Inactive Publication Date: 2016-09-21
WUXI KEYBRIDGE ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem to be solved in the prior art is that the oscillator and the clock calibration circuit can realize the function of the clock circuit together, and provide a relatively accurate clock for the normal operation of the chip.

Method used

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  • Clock dynamic calibration method and circuit based on UHF RFID chip
  • Clock dynamic calibration method and circuit based on UHF RFID chip
  • Clock dynamic calibration method and circuit based on UHF RFID chip

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Embodiment Construction

[0029] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0030] Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0031] like image 3 As shown, it involves a clock dynamic calibration method based on a UHF RFID chip, which controls the current to control the charge and discharge current of the capacitor in the oscillator, thereby controlling the length of the capacitor charge and discharge time to control the frequency of the output clock; clock calibration uses current calibration In this way, the baseband processor dynamically calibrates the clock frequ...

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Abstract

The present invention relates to a clock dynamic calibration method and circuit based on a UHF RFID chip, wherein the control current controls the size of the capacitor charging and discharging current in the oscillator, thereby controlling the length of the capacitor charging and discharging time to control the frequency of the output clock; clock calibration Using current calibration, the baseband processor dynamically calibrates the clock frequency according to the signal from the reader; when the output clock deviation exceeds a certain range, the digital baseband returns a set of data to change the size of the control current to change the frequency of the output clock , while receiving a reader command, the clock can be adjusted multiple times. When the command is received, the optimal clock is used to send a signal back to the reader, so that the tag can be accurately identified. The communication success rate between the tag chip and the reader of the clock circuit of the present invention can reach 100%, that is, each operation of the reader to the tag chip can obtain a correct response from the tag chip.

Description

technical field [0001] The invention relates to the technical field of passive ultra-high frequency radio frequency identification, in particular to a clock dynamic calibration method and circuit based on a UHF RFID chip. Background technique [0002] The current passive UHF radio frequency identification technology has the advantages of long distance, high speed, low cost and convenience. It has been widely used in identification, logistics management, warehouse management and other fields, and will become a basic technology for the construction of the information society in the future. . Among them, the function of the clock circuit in UHF RFID is to demodulate the forward data transmitted by the reader, and provide a precise clock for the modulated reflected signal of the chip, so as to precisely control the frequency of the backscattered data link and provide the digital circuit of the entire tag. working clock. [0003] like figure 1 and 2 As shown, the traditional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/284H03K19/177
CPCH03K17/284H03K19/177H03K19/17724
Inventor 蔡友向晓安张强张建王立泉
Owner WUXI KEYBRIDGE ELECTRONICS TECH CO LTD
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