Demodulation circuit for ultrahigh frequency radio frequency recognizing chip

Abstract

The invention discloses a demodulator circuit used for the ultrahigh frequency radio frequency distinguishing chip, including a detecting circuit and an envelope shaping circuit, wherein the radio frequency signals received by the antenna pass through the envelope detecting circuit and the envelope shaping circuit in turn and output the S signals and the Sav signals to a comparator; the envelope shaping circuit includes a bleeder resistor, a diode, a filter resistance and a filter capacitance, wherein the bleeder resistor is connected between the signal output end of the envelope detecting circuit and the ground, the anode of the diode is connected with the signal output end of the envelope detecting circuit, while the cathode is connected with one end of the parallel branch constituted by the filter resistance and the filter capacitance, and the other end is connected with the ground, wherein the signal output end of the envelope detecting circuit is the S signal output end, while the junction of the parallel branch constituted by the filter resistance and the filter capacitance is the Sav signal output end. The invention realizes the coexistence of the low power dissipation and low cost of the demodulator circuit of the ultrahigh frequency radio frequency distinguishing chip.

Description

technical field [0001] The invention relates to a demodulation circuit for an ultra-high frequency radio frequency identification chip. Background technique [0002] UHF RFID (Ultra High Frequency Radio Frequency Identification) is a non-contact automatic identification technology, which automatically identifies the target object and obtains relevant data through radio frequency signals, without manual intervention, and can work in various harsh environments , has great advantages in fast scanning, miniaturization, anti-pollution, good durability, reusable, penetrable reading, large data memory and reliable data, and is being widely used in various industries, such as logistics and warehousing , intelligent transportation, automatic toll collection, sea and air port cargo management, supermarket retail management, medical equipment management, postal cargo tracking, etc., and also has a wide range of applications in border management, personnel safety, and sports, promoting ...

AI Technical Summary

Problems solved by technology

[0015] In view of the above background, the present invention proposes a demodulation circuit for UHF radio frequency identification chips, which can solve the problem that low power consumption and low cost cannot coexist in the prior art

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