射频接收通道中AGC环路算法设计与研究
发布时间：2018-11-10 22:54
【摘要】：ZigBee技术作为无线传感网络中主要技术之一,具有低功耗、低成本和网络容量大等优点,广泛地应用于工业控制、智能家居和环境监测等领域。自动增益控制系统作为ZigBee射频接收机的重要组成部分,可以对不同强弱的信号,做出增益的自动调整,为后级电路提供一个稳定的电平。因此,高性能的自动增益控制系统有助于更好的提升ZigBee网络的通信质量。文中涉及到的射频接收机采用低中频结构,符合ZigBee技术低功耗和低成本的要求。接收机中的自动增益控制环路采取数字信号控制的方式,代替传统的模拟控制方式,数字自动增益控制可以直接产生指数形式的增益变化,省去了指数产生电路,降低了设计复杂度,并具有很高的线性度;将射频前端的低噪声放大器变为增益可控放大器,控制信号同样由数字自动增益控制算法模块产生,减少了自动增益环路中对增益动态范围的需求,同样降低了设计复杂度;自动增益控制环路中的PGA(Programmable Gain Amplifier)模块采取粗调部分和细调部分相结合的方式,不仅具有较高的精度,并且具有较大的动态范围,只需要细调部分的放大器增益可变,粗调部分采用固定增益的放大器即可,通过数字信号控制其打开与关闭,进一步降低了设计复杂度。该算法所控制的射频接收链路增益调节范围共102dB,变化精度为2dB,其中低噪声放大器模块的动态范围为32dB,分为-2dB、14dB和30dB三个状态,环路中可编程放大器的动态范围为70dB,分为粗调部分和细调部分,粗调部分是4个增益为14dB的固定增益放大器,细调部分是动态范围为14dB,变化精度为2dB的可变电阻放大器。依据5个峰值检测器的结果对这两个部分进行控制,对应的是低噪放控制模块和可编程放大器控制模块,并加入增益分配调整模块来优化电路中的噪声系数。在ModelSim SE软件中完成了对该算法的功能仿真验证,并通过Design Compiler综合、Soc Encounter布局布线等EDA工具完成了其版图设计。
[Abstract]:As one of the main technologies in wireless sensor networks, ZigBee technology has the advantages of low power consumption, low cost and large network capacity. It is widely used in industrial control, smart home and environmental monitoring and other fields. As an important part of ZigBee radio frequency receiver, the automatic gain control system can automatically adjust the gain of different strong and weak signals, and provide a stable level for the latter stage circuit. Therefore, high performance AGC system is helpful to improve the communication quality of ZigBee network. The RF receiver in this paper adopts low intermediate frequency structure, which meets the requirements of low power consumption and low cost of ZigBee technology. The automatic gain control loop in the receiver adopts the digital signal control instead of the traditional analog control method. The digital automatic gain control can directly produce the exponential gain change and eliminate the exponential generation circuit. The design complexity is reduced and the linearity is very high. The low noise amplifier of the RF front end is transformed into a gain controllable amplifier, and the control signal is also generated by the digital automatic gain control algorithm module, which reduces the demand for the dynamic range of the gain in the automatic gain loop and also reduces the design complexity. The PGA (Programmable Gain Amplifier) module in the AGC loop adopts the combination of coarse tuning part and fine tuning part, which not only has high precision, but also has a large dynamic range, and only needs the amplifier gain of fine tuning part to be variable. In the coarse tuning part, the fixed gain amplifier can be used to control the opening and closing of the amplifier by digital signal, which further reduces the design complexity. The range of gain adjustment of RF receiving link controlled by this algorithm is 102 dB, and the variation precision is 2 dB. The dynamic range of low noise amplifier module is 32 dB, which is divided into-2 dB and 30dB states, and the dynamic range of programmable amplifier in loop is 70 dB. There are four fixed gain amplifiers with 14dB gain and four variable resistor amplifiers with dynamic range of 14dB with varying precision of 2dB. According to the results of the five peak detectors, the two parts are controlled, corresponding to the low noise amplifier control module and the programmable amplifier control module, and the gain allocation adjustment module is added to optimize the noise coefficient in the circuit. The functional simulation of the algorithm is completed in the ModelSim SE software, and the layout is designed by EDA tools such as Design Compiler integrated, Soc Encounter layout and routing.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92
[Abstract]:As one of the main technologies in wireless sensor networks, ZigBee technology has the advantages of low power consumption, low cost and large network capacity. It is widely used in industrial control, smart home and environmental monitoring and other fields. As an important part of ZigBee radio frequency receiver, the automatic gain control system can automatically adjust the gain of different strong and weak signals, and provide a stable level for the latter stage circuit. Therefore, high performance AGC system is helpful to improve the communication quality of ZigBee network. The RF receiver in this paper adopts low intermediate frequency structure, which meets the requirements of low power consumption and low cost of ZigBee technology. The automatic gain control loop in the receiver adopts the digital signal control instead of the traditional analog control method. The digital automatic gain control can directly produce the exponential gain change and eliminate the exponential generation circuit. The design complexity is reduced and the linearity is very high. The low noise amplifier of the RF front end is transformed into a gain controllable amplifier, and the control signal is also generated by the digital automatic gain control algorithm module, which reduces the demand for the dynamic range of the gain in the automatic gain loop and also reduces the design complexity. The PGA (Programmable Gain Amplifier) module in the AGC loop adopts the combination of coarse tuning part and fine tuning part, which not only has high precision, but also has a large dynamic range, and only needs the amplifier gain of fine tuning part to be variable. In the coarse tuning part, the fixed gain amplifier can be used to control the opening and closing of the amplifier by digital signal, which further reduces the design complexity. The range of gain adjustment of RF receiving link controlled by this algorithm is 102 dB, and the variation precision is 2 dB. The dynamic range of low noise amplifier module is 32 dB, which is divided into-2 dB and 30dB states, and the dynamic range of programmable amplifier in loop is 70 dB. There are four fixed gain amplifiers with 14dB gain and four variable resistor amplifiers with dynamic range of 14dB with varying precision of 2dB. According to the results of the five peak detectors, the two parts are controlled, corresponding to the low noise amplifier control module and the programmable amplifier control module, and the gain allocation adjustment module is added to optimize the noise coefficient in the circuit. The functional simulation of the algorithm is completed in the ModelSim SE software, and the layout is designed by EDA tools such as Design Compiler integrated, Soc Encounter layout and routing.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92
【共引文献】
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1 何晓燕;王庆春;;CMOS反相器电压传输特性的分析和仿真[J];安康师专学报;2006年02期
2 安杰;邳雪松;李挥;马建设;程雪岷;林家用;;用于PDIC的跨阻放大器的优化设计[J];半导体光电;2009年05期
3 谢凌寒;吴金;汪少康;李艳芳;吴毅强;;宽输入共模范围电压比较器的设计[J];半导体技术;2007年12期
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