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Rfid reader and circuit and method for echo cancellation thereof

一种射频识别装置、回声消除的技术，应用在内存记录载体读取问题、仪器、电气元件等方向，能够解决减低读取器101灵敏度以及无杂波干扰动态范围等问题

Inactive Publication Date: 2008-06-18
IND TECH RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the echo problem seriously reduces the sensitivity of the reader 101 and the spurious-free dynamic range (SFDR: spurious-free dynamic range)

Method used

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  • Rfid reader and circuit and method for echo cancellation thereof
  • Rfid reader and circuit and method for echo cancellation thereof
  • Rfid reader and circuit and method for echo cancellation thereof

Examples

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Embodiment Construction

[0070] FIG. 4 shows a schematic circuit diagram of an RFID reader 400 including an echo cancellation circuit 407 according to an embodiment of the present invention. The RFID reader 400 includes a back-end module 450 , a circulator 405 , an antenna 406 , a band-pass filter (BPF: band-pass filter) 410 , two low-noise amplifiers 411 and 413 , and an echo cancellation circuit 407 . The back-end module 450 includes a control unit 401 , a radio frequency oscillator 402 , a power splitter 403 , a power amplifier 404 , and a demodulator 414 . Among the elements of the RFID reader 400, the control unit 401, the RF oscillator 402, the power splitter 403, the circulator 405, the antenna 406, and the demodulator 414 are compatible with the existing RFID reader 101 The corresponding elements in are similar. The power splitter 403 can be replaced by a coupler or any device with the same signal transmission capability. The circulator 405 can be replaced with a coupler or any device with t...

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PUM

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Abstract

An echo cancellation circuit for an RFID reader and the method thereof are provided. The echo cancellation circuit includes a gain calculator, a gain adjustment circuit, and a subtraction circuit. The gain calculator provides a complex gain value according to a carrier signal and a received signal through an adaptive algorithm. The gain adjustment circuit is coupled to the gain calculator. The gain adjustment circuit multiplies the carrier signal by the complex gain value, and outputs the result of the multiplication. The subtraction circuit is coupled to the gain adjustment circuit. The subtraction circuit subtracts the output of the gain adjustment circuit from the received signal, and then provides the result of the subtraction as the output signal of the echo cancellation circuit.

Description

technical field [0001] The present invention relates to a radio frequency identification device (RFID: radio frequency identification) reader, and in particular to an echo cancellation circuit and method for the radio frequency identification device reader. Background technique [0002] FIG. 1 shows a schematic diagram of a conventional RFID reader 101 and several RFID tags, such as three RFID tags 102-104. The reader 101 emits ultra high frequency (UHF: ultra high frequency) electromagnetic waves to drive the tags 102 - 104 so that the tags 102 - 104 can return data to the reader 101 . FIG. 2 shows a schematic diagram of the circuit of a conventional radio frequency identification device reader 101 . The radio frequency identification device reader 101 includes a radio frequency oscillator (RF oscillator) 201, a power splitter (power splitter) 202, a power amplifier (PA: power amplifier) ​​203, a modulator (modulator) 204, a circulator (circulator) 205, An antenna 206 , a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/00H04B3/23
CPCG06K7/0008G06K7/10346
Inventor 林志鸿李进府余佳任陈俊才
Owner IND TECH RES INST
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