| RFID technology has been widely used in the construction of Io T sensor networks due to its advantages such as low power consumption,low cost and long wireless communication distance.With the expansion of the commercial scale of the fifth-generation mobile communication technology(5G),the world of intelligent connection of everything is becoming a reality.The rapid development of 5G means that the Internet of Things can transmit massive amounts of data.At this time,the timeliness of environmental information in the sensor network becomes particularly important.RFID with integrated sensors needs to transmit information more quickly and accurately.The inventory efficiency of RTF(Reader Talk First)mode adopted by traditional RFID has been unable to meet the needs.The more efficient TTO(Tag Talk Only)mode is developing,and the RFID tag compatible with more working modes and more standards has become a new research direction.Based on the passive temperature sensor tag chip architecture,this paper designs two digital basebands compatible with TTO mode.The first digital baseband based on custom protocol,enters RTF mode after power-on reset.If no downlink command is received within 5ms,it jumps to TTO mode and continues to return data within the matched pulse time slot according to the activation password.The "roll call" and time division multiple access technology are innovatively applied to TTO mode to improve inventory efficiency and anticollision effect.The second digital baseband is based on the ISO18000-6C protocol.This paper proposes a method to switch modes and achieve compatibility based on stored information,that is,save the mode flag information by using the user storage area in the memory,and select the mode according to the information when the digital baseband is initialized.After completing the compatibility design of the two baseband working modes,write the RTL code of each module,and verify the functional correctness of the design through simulation.Based on the TSMC 0.18μm process,the two basebands are separately logically synthesized,and the clock gating integrated cell of the process library is inserted into the netlist to optimize power consumption.The total power consumption after custom baseband synthesis is 9.91μW,which achieves 24.46% optimization.The total power consumption after ISO18000-6C protocol baseband synthesis is 23.14μW,which achieves 55.01% optimization.On the basis of logic synthesis,this paper completed the physical design of the digital baseband of the two tag chips,and obtained the total power consumption after placement and routing.The total power consumption of the custom baseband is 27.45μW,and the total power consumption of the ISO18000-6C protocol baseband is 51.87μW.Finally,this paper extracts the parasitic parameters of the digital baseband layout,completes the static timing analysis and physical verification of the overall layout of the tag chip.In this paper,the custom protocol system test environment is built,and the prototype of the custom baseband function is verified.When the baseband function is consistent with the protocol,the tag chip of the custom protocol is taped out.This paper also uses the Impinj R1000 reader to prototype the ISO18000-6C baseband,and the verification results show that the baseband function complies with the protocol.Finally,this paper has carried on the physical test to the custom protocol label chip,the chip function is correct,among them the multi-label TTO mode test result accords with the anticipated design.The two basebands designed in this paper that are compatible with the TTO mode can provide real-time environmental information,and have a strong competitive advantage in the era of building intelligent sensor networks. |
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