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Demodulation circuit suitable for nfc tags
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A technology for demodulating circuits and resistors, which is applied in the field of demodulating circuits, can solve the problems of increasing circuit design complexity, increasing chip cost, increasing chip area, etc., achieving the goals of increasing complexity, reducing chip area, and reducing loss Effect
Active Publication Date: 2019-03-12
中黍(北京)生物科技有限公司
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Therefore, the design of the 100% demodulation circuit of this scheme not only increases the complexity of the circuit design but also increases the area of the chip and increases the cost of the chip.
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[0021] The present invention will be further described below in conjunction with specific embodiments, and the advantages and characteristics of the present invention will become clearer along with the description. However, these embodiments are only exemplary and do not constitute any limitation to the scope of the present invention. Those skilled in the art should understand that the details and forms of the technical solutions of the present invention can be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the protection scope of the present invention.
[0022] see figure 2 , The present invention relates to a demodulation circuit suitable for NFC tags, including high-voltage PMOS tubes HVPM1, HVPM2, HVPM3, high-voltage NMOS tubes HVNM1, HVNM2, HVNM3, HVNM4, low-voltage PMOS tubes LVPM1, LVPM2, LVPM3, LVPM4, low-voltage NMOS tubes LVNM1, LVNM2, LVNM3, LVNM4, resistors R1, R2...
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Abstract
The invention relates to a 100% demodulation circuit for NFC tag, comprising high pressure PMOS pipe HVPM1, HVPM2, HVPM3, high pressure NMOS pipe HVNM1, HVNM2, HVNM3, HVNM4, low pressure PMOS pipe LVPM1, LVPM2, LVPM3, LVPM4, low pressure NMOS pipe LVNM1, LVNM2, LVNM3, LVNM4, resistance R1, R2, R3 and electric capacity C1, C2. The invention has the advantages that by using the combination of nonlinear circuit and low-pass filter, the modulation signal sent from the NFC reading device is detected, by fully utilizing the difference between the threshold voltage characteristics of the high voltage devices and the low voltage devices in the circuit design, as well as with the RC filter network, the 100% demodulation function of the modulation signal can be achieved.
Description
technical field [0001] The invention relates to a demodulation circuit suitable for NFC tags. Background technique [0002] NFC (Near Field Communication) tag chip is an IC chip that stores data and can be read by NFC devices. It is usually used in passive communication mode. It has the advantages of small size, light weight, low cost and long service life. Widely used in anti-counterfeiting and traceability of products, supply chain management, access control, public transportation systems and other major industries. [0003] The NFC tag chip is mainly composed of three core modules: RF analog front end, digital controller and memory. The RF analog front-end is responsible for obtaining RF energy to provide power to the entire tag chip, recover data, and generate clock signals. It is the key to whether the chip can work stably, and the 100% demodulation circuit is a part of the entire data recovery. Demodulation is the reverse process of modulation, which is the process o...
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Application Information
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