Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Comparison and decision circuit in amplitude keying signal demodulation circuit module

A signal demodulation and circuit module technology, applied in the field of analog signal processing and radio frequency identification, can solve the problems of large area, large noise, and unfavorable reduction of RFID Tag area demodulation accuracy, etc., to reduce noise, reduce chip area, eliminate Effects of Common Mode Signals

Inactive Publication Date: 2009-06-10
ZHEJIANG XINGSHENG IOT TECH
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the use of resistors in the differential circuit, when implemented by on-chip integration, there are problems of large area and large noise, which is not conducive to reducing the area of ​​​​the RFID Tag and improving the demodulation accuracy

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Comparison and decision circuit in amplitude keying signal demodulation circuit module
  • Comparison and decision circuit in amplitude keying signal demodulation circuit module
  • Comparison and decision circuit in amplitude keying signal demodulation circuit module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0019] The demodulation circuit for the ASK signal with shallower modulation depth for RFID Tag proposed by the present invention is described in detail in conjunction with the accompanying drawings as follows:

[0020] The overall structure of the comparison and decision circuit of the present invention is as follows: figure 2 shown. It includes a differential circuit, a reference voltage generation circuit, a hysteresis comparator circuit and a bias voltage generation circuit, wherein the output terminals of the differential circuit and the reference voltage generation circuit are connected to the input terminals of the hysteresis comparator circuit, and the bias The voltage generating circuit is respectively connected with the differential circuit, the reference voltage generating circuit and the hysteresis comparator circuit to provide a stable DC bias for the differential circuit, the reference voltage generating circuit and the hysteresis comparator circuit; the RF ASK ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a compare and decide circuit of amplitude key-control signal demodulation circuit, belonging to the analogue signal process and radio frequency recognize technique. Said circuit comprises: a differential coefficient circuit, a reference voltage generation circuit, a hysteresis comparator circuit, and a bias voltage generate circuit. Wherein, said differential coefficient circuit is formed by a PMOS tube, a NMOS tube and a capacitor; said reference voltage generation circuit is formed by a PMOS tube, a NMOS tube and a capacitor. The invention can solve the problem that modulation depth is too shallow of the modulation signal sent from the Reader to the Tag in RFID protocol (as ISO / IEC FDIS 18000-6 protocol), and it can simple structure, small and high sensitivity.

Description

technical field [0001] The invention belongs to the field of analog signal processing and radio frequency identification technology (RFID), in particular to a comparison and judgment circuit in an amplitude keying (ASK) signal demodulation circuit module on an RFID tag (Tag). Background technique [0002] In the RFID system, the Reader (card reader) communicates with the Tag by transmitting radio frequency modulation signals to the Tag (label). In the ISO / IEC FDIS 18000-6 protocol, the modulation signal is an amplitude keying (ASK) signal with a relatively shallow depth (up to 27% at the shallowest). The function of the demodulation circuit module on the Tag is to demodulate the ASK signal into a standard digital signal and output it to the digital circuit. The general demodulation circuit structure used to demodulate ASK signal with shallow depth is as follows: figure 1 As shown, it is composed of an envelope detection circuit, a comparison and judgment circuit, and a sha...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/06G06K7/00
Inventor 白蓉蓉李永明张春王志华
Owner ZHEJIANG XINGSHENG IOT TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com