UHF RFID reader baseband signal processing and modulation circuit

Abstract

The invention discloses an ultrahigh-frequency radio frequency identification device (RFID) reader baseband signal processing and modulating circuit which comprises a first-level digital filter circuit, a second-level continuous time filter circuit, an operational amplifier circuit and a modulator circuit. The first-level digital filter circuit is used for filtering high-order harmonic wave to output low-frequency analog signals; the second-level continuous time filter circuit is used for smoothing the low-frequency analog signals to output intermediate-frequency signals; the operational amplifier circuit is used for performing zero-offset in-phase attenuation processing on the intermediate-frequency signals; and the modulator circuit is used for mixing the processed intermediate-frequency signals and local oscillator signals to output modulating signals. The ultrahigh-frequency RFID reader baseband signal processing and modulating circuit processes and modulates signals output by a baseband processor and orders or data of label communication, can meet different communication requirements, is easy to implement and low in power consumption and cost, and can adapt to baseband data rate with different speed, and the cut-off frequency of the filter can be adjusted.

Description

technical field [0001] The invention belongs to the technical field of radio frequency identification, and in particular relates to the design of a baseband signal processing and modulation circuit of an ultra-high frequency RFID reader. Background technique [0002] Compared with passive high frequency (13.56MHz) RFID technology, passive UHF (840MHz~960MHz) RFID technology has the advantages of long reading distance, fast reading speed and large storage capacity. [0003] At present, RFID technology is developing rapidly, and its application in various aspects is becoming more and more extensive. Especially in the military, as the main supporting technology in the military informatization, the radio frequency identification technology of the Internet of Things is the most original data identification and collection technical means of the information system. Its development and application will determine the degree of military informatization construction. With the promulga...

AI Technical Summary

Problems solved by technology

In terms of RFID protocol implementation technology, readers based on ISO international standards are all integrated solutions using professional transceiver chips. Due to the realistic requirements of confidential communication, the biggest defect of this solution is that the protocol has been solidified and cannot meet the requirements of independent radio frequency identification technology. military standard

Therefore, the realization of the independent RFID protocol, that is, the national standard or the national military standard RFID protocol, cannot rely on the integrated solution of professional transceiver chips, but can only independently build a discrete protocol implementation platform.

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