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Demodulating circuit for ultrahigh-frequency RFID (radio frequency identification) tag chip

A technology of RFID tags and demodulation circuits, which is applied to record carriers, instruments, and computer parts used in machines. It can solve the problems of low dynamic range, poor anti-interference ability, and high power consumption of demodulation circuits, and achieve high dynamic range. , the effect of low power consumption and good noise suppression performance

Inactive Publication Date: 2015-05-20
CHENGDU ZHAOMEI SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the demodulation circuit of its analog RF front end still has the problems of high power consumption, poor anti-interference ability and low dynamic range.

Method used

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  • Demodulating circuit for ultrahigh-frequency RFID (radio frequency identification) tag chip

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Embodiment Construction

[0009] The present invention will be further described below in conjunction with accompanying drawing:

[0010] like figure 1 As shown, the present invention is a demodulation circuit for UHF wireless RFID tag chip, including the first capacitor C1 to the fourth capacitor C4, the first diode D1, the second diode D2, the first transistor P1 To the six transistors P6, the first resistor R1 to the fourth resistor R4 and the comparator, the circuit input signal terminal is connected to the first terminal of the first capacitor C1, and the circuit output signal terminal is respectively connected to the anode of the second diode D2, the second The first terminal of the capacitor C2, the first terminal of the first resistor R1, the source of the second transistor P2, the first terminal of the third capacitor C3, the first terminal of the fourth capacitor C4, the source of the fourth transistor P4 and The source of the sixth transistor P6 is connected to the ground, the second end of...

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PUM

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Abstract

The invention discloses a demodulating circuit for an ultrahigh-frequency RFID (radio frequency identification) tag chip. The demodulating circuit comprises first to fourth capacitors, a first diode, a second diode, first to sixth transistors, first to fourth resistors and a comparator. The input signal end of a circuit is connected with the first end of the first capacitor; the output signal end of the circuit is connected with an anode of the second diode, the first end of the second capacitor, the first end of the first resistor, a source of the second transistor, the first end of the third capacitor, the first end of the fourth capacitor, a source of the fourth transistor and a source of the sixth transistor before grounded. The demodulating circuit has high noise suppressing performance and is low in power consumption.

Description

technical field [0001] The invention relates to a demodulation circuit, in particular to a demodulation circuit for an ultra-high frequency wireless RFID tag chip. Background technique [0002] Ultra-high frequency radio frequency identification technology has the advantages of non-contact, fast identification speed, long range, large storage capacity and multi-card identification, and has been widely used in production, retail, transportation and logistics industries. As the core component of UHF radio frequency identification system, RFID passive tag chip has been a research hotspot at home and abroad in recent years. However, the demodulation circuit of its analog RF front end still has the problems of high power consumption, poor anti-interference ability and low dynamic range. Contents of the invention [0003] The object of the present invention is to provide a demodulation circuit for a UHF wireless RFID tag chip in order to solve the above problems. [0004] In o...

Claims

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Application Information

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IPC IPC(8): G06K19/077
Inventor 唐海龙
Owner CHENGDU ZHAOMEI SCI & TECH