BPSK modulation circuit based on low-power-consumption backscattering amplification tag and method thereof

Abstract

The invention discloses a BPSK modulation circuit and method based on a low-power-consumption backscattering amplification tag, the circuit comprises an antenna, the low-power-consumption backscattering amplification tag and a bias voltage switching module, wherein the antenna is used for receiving an incident excitation signal; the bias voltage switching module is used for providing different bias voltages; the low-power-consumption backscattering amplification tag is respectively connected with the antenna and the bias voltage switching module and is used for amplifying the incident excitation signal according to the different bias voltages and outputting a scattering signal; and the antenna is also used for sending the scattering signal. The bias voltage switching module performs switching power supply on the low-power-consumption backscattering amplification tag, and utilizes different impedances presented by the low-power-consumption backscattering amplification tag under different bias voltages to change phase information of a scattering coefficient of the low-power-consumption backscattering amplification tag so as to realize BPSK modulation, and the circuit is simple to realize.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a BPSK modulation circuit based on a low-power backscattering amplification tag and a method thereof. Background technique [0002] In passive RFID systems, when the antenna senses a current through an incoming radio frequency signal, it provides enough power to drive an integrated circuit on the tag and respond, using a technique known as backscatter modulation. Therefore, the antenna must be designed to be able to collect power from the incoming signal and send out a backscattered signal. [0003] In current RFID, generally speaking, no-gain backscatter tags and simple LC circuits are used for phase modulation of backscatter signals. Satisfied well, but the operability of the circuit and the instability of the phase modulation and the transmission distance are also a problem that needs to be faced. Using a control circuit capable of phase shifting t...

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Problems solved by technology

[0004] However, the power consumption of the existing phase-shift control circuit is relatively large, and the complexity of the circuit will be further increased.

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