用于UHF RFID閱讀器芯片的完全前饋式多比特Delta-Sigma調(diào)制器設(shè)計
[Abstract]:Unlike Nyquist analog-to-digital converters, Delta-Sigma analog-to-digital converters play an important role in more and more fields because they do not require accurate passive device matching. Based on 0.18 渭 m CMOS technology and according to the requirements of UHF RFID reader chip, a switched capacitor Delta-Sigma modulator for A / D conversion is designed in this paper. The results are as follows: 1. Firstly, the basic principle of Delta-Sigma modulator is analyzed in detail according to the linear model and the characteristics of its three common structures are analyzed. In addition, the stability of Delta-Sigma modulator is analyzed according to the nonlinear model. Finally, the requirement of sampling clock is analyzed. In the system design, the single-loop three-order four-bit quantization structure is adopted, and the loop filter is realized with the complete feedforward structure. The behavior-level simulation verifies its advantage over the traditional feedback structure: the output swing of the integrator is smaller than that of the reference voltage, which will greatly reduce the performance requirements of the operational amplifier. In addition, the problem of non-ideal multi-bit feedback DAC is restrained by DWA technology. Finally, the performance index of each module circuit is determined by behavior-level simulation. In the circuit design, a closed-loop active summation circuit is used to make the system process larger input signal amplitude (-1dBFS). Because of its closed loop structure, it is insensitive to process deviation relative to the open-loop summation circuit. In addition, the non-ideal characteristics of the circuit are qualitatively analyzed to guide the selection of the operational amplifier structure in the summation circuit. Finally, all the transistor level circuit design and layout design of the modulator analog circuit are completed. The simulation results show that the modulator can achieve more than 12 bits in the 1.5MHz bandwidth at 48MHz sampling speed, and consume a current of 5 Ma at 3.3 V supply voltage. This thesis is supported by the National Natural Science Foundation of China, "Research on Multi-noise Modeling and Optimization of UHF RFID Reader Chip" (61306034) and "Research and Test Verification of Anti-collision of Mobile UHF RFID Reader" (61302005).
【學位授予單位】:華東師范大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TP391.44;TN761
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