A differential input radio frequency identification tag AM envelope signal demodulation circuit
A radio frequency identification tag, differential input technology, applied in the field of radio frequency identification, can solve the problems of single-ended signal input not easy to interfere factors, difficult detection operation, difficult envelope demodulation, etc., to eliminate auxiliary envelope demodulation and peak detection. requirements, meet ultra-low power consumption, reduce design difficulty and the effect of production
Active Publication Date: 2021-11-19
EXCELIO TECH SHENZHEN
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This structure is used as a traditional technology. Because of the effect of the diode threshold, it is difficult to perform detection operation on the case of low input signal amplitude, and it is not easy to eliminate the interference factors of ground instability with single-ended signal input, and it is difficult to obtain a high-performance Envelope demodulation of
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[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0047] Such as Figure 4As shown, a radio frequency identification tag AM wave envelope signal demodulation circuit with differential input according to the present invention includes two parts: a signal input module and an envelope demodulation module,
[0048] The signal input module is used to sample an external command signal, and input it to the envelope demodulation module through double-terminals in the form of an AM wave;
[0049] The envelope demodulation...
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The present invention belongs to the technical field of radio frequency identification, and specifically refers to a radio frequency identification tag AM wave envelope signal demodulation circuit with differential input. The demodulation circuit includes two parts: a signal input module and an envelope demodulation module. It is used to sample the external command signal and input it to the envelope demodulation module through double-terminals in the form of AM wave. The envelope demodulation module includes two parts: a common mode signal extraction module and a digital output module. The common mode signal extraction module is used to input from the signal The common-mode voltage of the envelope component of the differential signal input by the two-terminal input is extracted from the modulated signal input by the module as the envelope signal, and the digital output module is used to convert the extracted common-mode signal into a digital representation of the envelope information of the input amplitude modulation wave. square wave signal. The invention uses a differential input structure to sample the antenna end, and the transconductance Gm of the differential pair tube can be large enough, so the structure has high sensitivity and good adaptability.
Description
technical field [0001] The invention belongs to the technical field of radio frequency identification, and specifically refers to a demodulation circuit which adopts a differential input mode and obtains a common-mode voltage of a differential signal as an envelope signal for demodulation. Background technique [0002] Radio frequency identification (RFID) tags are the most basic core technical components in the application system architecture of the Internet of Things. They play a role in tracking, traceability, and big data collection in the fields of logistics management, asset security and tracking management, access authority management, and food safety traceability. etc. effect. The main communication methods of radio frequency identification tags are divided into active response and passive response. The active response method, also known as TTF (Tag Talks First) method, is a method in which the radio frequency identification tag enters a loop to repeatedly send its ...
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IPC IPC(8): H04L27/06H04B5/00
CPCH04L27/06H04B5/77
Inventor 吴边
Owner EXCELIO TECH SHENZHEN