适用于无线医疗监护系统的低频唤醒模块模拟解调器电路设计与研究

发布时间：2018-01-14 13:22

  本文关键词：适用于无线医疗监护系统的低频唤醒模块模拟解调器电路设计与研究　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 模拟解调器 亚阈值设计 低功耗 高灵敏度

【摘要】：近年来,无线通讯设备的不断发展,使其成为实现多种医疗和非医疗应用的关键技术。但是这类无线通讯设备多采用电池供电,这对系统功耗提出了很高要求。低频唤醒技术,能有效降低系统功耗,延长电池的使用寿命。而模拟解调器作为低频唤醒模块中不可或缺的部分受到了越来越多的关注。本文从无线医疗监护系统的应用出发,研究低频唤醒模块的低功耗设计理论及其中模拟解调器的电路设计。完成的主要研究工作如下:(1)构建了一种适用于幅移键控(ASK)调制的模拟解调器系统,通过设计具有屏蔽带外噪声功能的电路如选频放大器、整流器、带通滤波器和具有幅值选择功能的比较器等,最大程度上减小噪声对解调结果的影响,提高系统灵敏度,保证解调的正确性。(2)采用亚阈值电路设计方法对模拟解调器中的电路进行设计,电路中的大多数晶体管工作在亚阈值区,达到降低系统功耗的目的。(3)设计模拟解调器系统版图,通过版图优化大大减小了版图的寄生电容对电路频率特性的影响。本设计采用SMIC公司0.18μm工艺,仿真结果显示本文所设计的模拟解调器系统可以在SS/TT/FF工艺角下,温度-40--120℃,电源电压2.0—3.6V范围内对天线接收到的ASK调制信号进行正确解调,系统检测灵敏度可以达到1mVPP,在典型工作环境下(电源电压3.3V,工作温度27℃),正常工作时系统功耗低于3.3μA。
[Abstract]:In recent years, with the development of wireless communication equipment, it has become the key technology to realize a variety of medical and non-medical applications, but most of these wireless communication devices use battery power. The low frequency wake-up technology can effectively reduce the power consumption of the system. As an indispensable part of low-frequency wake-up module, analog demodulator has attracted more and more attention. This paper starts from the application of wireless medical monitoring system. The low power design theory of low frequency wake-up module and the circuit design of analog demodulator are studied. The main research work is as follows: 1) A kind of ASK for amplitude shift keying is constructed. A modulated analog demodulator system. By designing circuits with the function of shielding out-of-band noise, such as frequency-selecting amplifier, rectifier, bandpass filter and comparator with amplitude selection function, the influence of noise on demodulation results is minimized. Improve the sensitivity of the system to ensure the correctness of the demodulation. 2) the sub-threshold circuit design method is used to design the circuits in analog demodulator, most of the transistors in the circuit work in the sub-threshold region. To achieve the purpose of reducing the power consumption of the system, the layout of the analog demodulator system is designed. The influence of parasitic capacitance on the frequency characteristics of the circuit is greatly reduced by layout optimization. This design adopts SMIC 0.18 渭 m process. The simulation results show that the analog demodulator system designed in this paper can be used at the temperature of -40--120 鈩，

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