Pseudo-random number generating circuit and generating method of radio frequency identification tag chip

Abstract

The invention discloses a pseudo-random number generating circuit and a generating method of a radio frequency identification tag chip, which relate to the radio frequency identification (RFID) technology. The pseudo-random number generating circuit of the invention comprises an on-chip oscillator and a power-on reset signal generator in the radio frequency identification tag chip. The pseudo-random number generating circuit is characterized by also comprising a counter, a controller, a processor and a pseudo-random number generator, wherein the on-chip oscillator, the counter, the processor and the pseudo-random number generator are connected sequentially, the power-on reset signal generator is connected with the pseudo-random number generator through the controller, and the other outputof the controller is connected with the counter. Compared with the prior art, the invention has the characteristics of simple circuit structure, low cost, low power consumption, small area and easy integration.

Description

technical field [0001] The invention relates to radio frequency identification (RFID) technology, in particular to a pseudo-random number generation circuit of a tag chip in the radio frequency identification system and a corresponding pseudo-random number generation method. Background technique [0002] In the field of radio frequency identification technology, there are many methods for anti-collision identification of tags. Some methods, such as pure ALOHA algorithm, random time slot algorithm, etc., need to generate a random number in the tag, and then allocate the time slot of the tag according to the size of the random number. Since the time slot allocation is based on the size of the generated random number, the randomness of the random number directly affects the anti-collision performance of the tag, thereby affecting the identification efficiency of the radio frequency identification system. [0003] In addition to the above-mentioned anti-collision problems in ra...

AI Technical Summary

Problems solved by technology

However, the shortcomings of the above-mentioned patented technologies are that the circuit structure is complex, the cost is high, and the power consumption is large, which cannot meet the low power consumption requirements of passive radio frequency identification.

Moreover, some of the above methods use special devices, such as Zener diodes, which are not conducive to CMOS integration.

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