Linearization Ultra-high Radio Frequency Identification Reader Transmitter Design,

An UHF (Ultra High Frequency) RFID (Radio Frequency Identification Definition) System that based on the RFID reader system which includes the reader's transmission baseband simulation model and the circuit design is presented in this thesis. Also within this thesis, the structure of the RFID reader transmitter, the design and the implementation of the RFID reader transmitter's baseband circuit are proposed, according to the specific requirement of the UHF RFID Transmission System.At the very beginning, the thesis gives out the reason that causes the nonlinearity of an UHF RFID Transmitter System, the measurement of the power amplifier's nonlinearity and the simulation model that can be used to describe the nonlinearity that caused by the power amplifier within an UHF RFID Transmitter. Then the paper lists out three different types of linearization technologies and the process of the analysis and the comparison between each of these different types of linearization technology on the aspect of its linearization performance, stability and energy-consuming index and its systematic cost. And due to the comparison between different types of linearization technologies, the first part of this paper drives out the digital pre-distortion linearization technology as the most suitable linearization technology for the UHF RFID system.At the second part of the thesis, we analysis the character of the transmitter's transmitting signals and propose the structure of an linearized UHF RFID Transmitter. Then we divide the UHF Transmitter into several functional sub-modules, based upon side of which we analyze each sub-modules'performance and accomplish the design of their required circuits. These circuits include a PIE encoding circuit, a pulse-shaping filter and four up-sampling half-band filters. All these baseband circuit designs and analysis ensure the UHF RFID Transmitter to meet the requirements both in its time domain and its frequency domain that have been specified by the UHF RFID System Protocol.The third part of the thesis states the performance analysis and the circuit design of the digital baseband pre-distortion linearization technology used in the UHF RFID Transmitter. In this part, a unique digital pre-distortion linearization method that based on the LUT table algorithm is proposed to meet the two different modulation methods required in RFID system, the double-side-band (DSB) modulation and the signal-side-band (SSB) modulation. And we do researches and analysis that can be used to prove the improvement of the transmitting signal's adjacent channel power (ACP) under both DSB and SSB modulation, while also study the effects of how the LUT table sizes that used in the digital pre-distortion algorithm will affect the improvement of the ACP and to minimize the implementation cost when gaining the same linearization effects. By using the technology of pre-distortion, we can increase our transmitting signal's linearity under the same power transmission efficiency and increase the data rate of the transmitting signal under the same required bandwidth which increase the spectrum usage of the transmitting signal. Finally, we realize all the digital baseband modules and circuits'designs that are required within the linearized UHF RFID reader transmitter.In the fourth part of the thesis, we realize all the digital baseband designs into real circuits and accomplish its layout with the technology of SMICl3 lP8M. Then we do the test of both the digital transmitter baseband and the digital pre-distortion algorithm on the UHF RFID System testing platform. All testing results presented in this thesis correspond with the systematic analysis and simulations and strongly prove the correctness of the linearized UHF RFID Reader Transmitter.