A kind of ask demodulator of radio frequency identification tag chip and its demodulation method

Abstract

The present invention discloses a radio-frequency identification label chip ASK demodulator and a demodulation method thereof. The demodulator comprises a demodulation circuit configured to filter the radio frequency carrier wave of inputting modulation signals and extracting the enveloping of the inputting modulation signals and output the enveloping of the inputting modulation signals to a differentiating circuit; the differentiating circuit configured to filter the low-frequency of the enveloping of the inputting modulation signals, extracting the edge changing information of the enveloping and outputting the edge changing information of the enveloping to the first input end of a comparator; a filter circuit configured to connect with the second input end of the comparator and configured to filter high-frequency signals inputted to the second end of the comparator; and the comparator configured to compare and amplify the input signals at two input ends and output the enveloping signals after digitization shaping. The radio-frequency identification label chip ASK demodulator and the demodulation method thereof can obtain large power range while ensuring the high sensitivity and the low loss.

Description

technical field [0001] The present invention relates to a radio frequency identification (Radio Frequency Identification, RFID) technology, in particular to an ASK (Amplitudc Shift Keying, Amplitude Shift Keying) demodulator of a radio frequency identification tag chip and a demodulation method thereof. Background technique [0002] Radio Frequency Identification (RFID) technology is a non-contact automatic identification technology. The identification process does not require manual intervention and can work in various harsh environments. Its basic principle is to use radio frequency signals and space coupling transmission characteristics for non-contact two-way communication. The concept of radio frequency identification (RFID) technology was proposed as early as the 1940s, but it was not widely used in the commercial field until the 1980s. After decades of development, RFID technology has been widely used in many aspects of production and life, such as: production equipm...

AI Technical Summary

Problems solved by technology

At present, most of the existing demodulation circuits are based on the scheme of envelope detection circuit + comparator + voltage limiting circuit. The defect of this technology is that it cannot obtain high sensitivity and large power range at the same time with low power consumption.

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