Unlock instant, AI-driven research and patent intelligence for your innovation.

RFID reader receiving analog baseband circuit

A technology that simulates baseband circuits and readers

Active Publication Date: 2013-03-20
SHANGHAI QUANRAY ELECTRONICS
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

figure 2 The left part is the square wave interference formed by transmission, and the latter part is the received signal. There is an obvious charge and discharge process from transmission to reception. The charge and discharge will affect the symbol recognition. When the charge and discharge are too serious, it will affect the normal recognition of the preamble. , resulting in the failure of normal demodulation

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
  • RFID reader receiving analog baseband circuit
  • RFID reader receiving analog baseband circuit
  • RFID reader receiving analog baseband circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The specific implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention should not be limited thereby.

[0027] see Image 6 System block diagram of the present invention. The RFID reader-writer of the present invention receives an analog baseband circuit, including a receiving down-converter, a high-pass filter, an IQ quadrature amplifier and a low-pass filter. There are two high-pass filters, two IQ quadrature amplifiers, the receiving downconverter, the first high-pass filter, the second high-pass filter, the first IQ quadrature amplifier, the second IQ quadrature The AC amplifier and the low-pass filter are connected in sequence, and the output terminal of the first high-pass filter is also connected with a switch circuit. The switch circuit can use a switch whose model is DG2715DL-T1-E3.

[0028] The improvement of the prese...

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 discloses an RFID reader receiving analog baseband circuit comprising a receiving low converter, high-pass filters, an amplifier and a low-pass filter, wherein, the receiving low converter, the high-pass filters, the amplifier and the low-pass filter are connected in sequence, and the output ends of the high-pass filters are also connected with a switch circuit. The low converter ofthe invention utilizes two high-pass filters, and a parallel switch is added between two high-pass filters; during transmission, a switch is switched to ground, interference formed by transmission isearthing in short circuit, the switch is off when receiving, and a signal normally passes through the high-pass filter to a subsequent circuit. After treated by the switch, the interference formed bytransmission is lowered to an acceptable degree, and charging and discharging are basically eliminated.

Description

technical field [0001] The invention relates to a radio frequency identification (Radio Frequency Identification, referred to as RFID) reader, in particular to an RFID reader receiving analog baseband circuit. Background technique [0002] figure 1 It is a block diagram of a general RFID system. The transmitting modulator, drive amplifier, power amplifier and isolator constitute the transmitting channel, and the receiving down-converter, high-pass filter, and IQ quadrature amplifier (IQ is generally translated as quadrature, I=Inphase in phase, Q = Quadrature quadrature) and a low-pass filter constitute the receiving part. Generally, the use of bias circuits in conjunction with amplifiers is common knowledge. figure 1 omitted and not drawn. [0003] Antenna multiplexers can use ferrite circulators or directional couplers. Generally, ferrite circulators and directional couplers have a transmission and reception isolation of 20dB, while the transmission power to the antenn...

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): H04B1/30H04B1/52G06K17/00H04B1/525
Inventor 岳流锋
Owner SHANGHAI QUANRAY ELECTRONICS