Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A Circuit for Improving the Waveform and Modulation Depth of Non-contact Card Strong Field Modulation

A modulation waveform, non-contact card technology, applied to record carriers, instruments, computer parts, etc. used in machines, can solve the problems of unsatisfactory modulation waveform, shallow modulation depth of strong field, and large area of ​​modulation discharge devices.

Active Publication Date: 2017-10-31
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems that the modulation depth of the strong field is too shallow, the modulation waveform is not ideal and the area of ​​the modulation discharge device is too large, and provide a method that does not increase the area of ​​the modulation discharge device additionally, but also increases the depth of the strong field modulation, improving Modulation Waveform Scheme

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
  • A Circuit for Improving the Waveform and Modulation Depth of Non-contact Card Strong Field Modulation
  • A Circuit for Improving the Waveform and Modulation Depth of Non-contact Card Strong Field Modulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The invention proposes a circuit for improving the modulation waveform and modulation depth of the non-contact card strong field. The circuit comprises: a voltage stabilizing circuit (1), a modulating circuit (2) and an inverter (4).

[0016] In the voltage stabilizing circuit, there is a switch K3 between the output VO of the detection circuit and the control terminal VC1 of the discharge switch K1, and the on and off of the switch K3 is controlled by the modulation data. The switch K3 is turned off in the modulation phase, and the switch K3 is turned on in the non-modulation phase. The switch K3 can be implemented with NMOS or PMOS, and can also be implemented with a transmission gate. The switch K1 can be implemented in the form of a MOS tube, or replaced by two switches connected between the antenna signal LA, the ground and the antenna signal LB, and the ground, or replaced by a switch connected between the RF power supply and the ground .

[0017] The modulation...

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 proposes a circuit for improving the modulation waveform and modulation depth of the non-contact card strong field, which can obtain better modulation waveform and modulation depth in the strong field without changing other circuits.

Description

technical field [0001] The present invention relates to a voltage stabilizing circuit and a modulating circuit of a non-contact card chip, and more specifically, the present invention relates to a circuit for improving the modulation waveform and modulation depth of a non-contact card strong field. Background technique [0002] There are two parts of the discharge circuit inside the contactless card chip: the discharge circuit of the voltage stabilizing circuit and the discharge circuit of the modulation circuit. The discharge current of the voltage stabilizing circuit is related to the antenna voltage and the RF power supply voltage. When it is detected that the antenna and RF power supply are lowered, the discharging current of the voltage stabilizing circuit decreases. When the card sends data to the card reader, the modulation circuit starts to discharge current, causing the amplitude of the card antenna to drop. When the voltage regulator circuit detects this drop, it ...

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): G06K19/077
Inventor 刘晓艳马哲
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap 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