数模混合线性化器CMOS电路设计
发布时间：2019-03-20 12:09
【摘要】：目前,无线通信系统朝着异构网络的形式发展,这引入了对宏基站和小基站的需求。宏基站实现广域的基本覆盖,在宏基站的盲点及数据流量较大的热点区域,通过小基站进行补充覆盖并提高网络容量。相比于宏基站,小基站的发射功率和覆盖范围较小,然而,基站中功率放大器的非线性并没有得到相应的减小。仍须通过线性化技术才能使功率放大器满足高峰均比信号传输的线性度要求。数字预失真技术(DPD)性能优越,模拟预失真(APD)结构简单,而数模混合线性化技术结合两者的优点,并具有低于DPD的功耗和高于APD的线性化能力。由于这些特点,数模混合线性化技术将是本文研究的主要内容。在混合线性化技术的验证中,选取了无记忆多项式作为预失真器的模型。基于复增益的查找表技术,以输入射频信号的包络信号功率作为查找表的索引值,得到矢量调制器的控制信号,然后用于调整输入射频信号的幅度及相位。通过系统的仿真验证线性化效果,功率放大器的增益压缩改善了0.8 dB,相位扩张改善了10.3°。使用间隔为1 MHz的双音信号,IMD3改善约32 dB,IMD5改善约18 dB。使用间隔为2 MHz的双音信号,IMD3改善约27 dB,IMD5改善约15 dB。使用带宽为3.84 MHz的CDMA2000调制信号,线性化后ACPR改善了15 dB。针对混合线性化系统,本文设计一款基于0.13μm CMOS工艺的数字控制矢量调制器,完成了电路原理图和版图的设计。整个芯片尺寸为1080μm?886μm,通过前仿真和后仿真验证了电路的性能,并初步验证了线性化性能。矢量调制器由10-bits数字信号控制,电源电压为1.2 V,电路静态功耗为17.5 mW,在3~4 GHz频段内,输入、输出端口的匹配良好(S11小于-22dB,S22小于-13 dB)。可实现的增益调节范围为11dB,相位调节范围为61°,噪声系数小于13.2 dB。
[Abstract]:At present, the wireless communication system is developing to the form of heterogeneous network, which introduces the need of macro base station and small base station. Macro base stations realize wide area coverage. In the blind spots of macro base stations and hot spots with large data traffic, small base stations are used to supplement coverage and improve network capacity. Compared with macro base station, the transmission power and coverage range of small base station is smaller than that of macro base station. However, the nonlinearity of power amplifier in base station has not been reduced correspondingly. The linearization technique is still needed to make the power amplifier meet the linearity requirement of the peak-to-average ratio (PAPR) signal transmission. Digital pre-distortion technology (DPD) has the advantages of superior performance and simple structure of analog pre-distortion (APD), while digital-analog hybrid linearization technology combines the advantages of both, and has lower power consumption than DPD and higher linearization ability than APD. Because of these characteristics, digital-analog hybrid linearization technology will be the main content of this paper. In the verification of the hybrid linearization technique, the memoryless polynomial is selected as the model of the predistorter. Based on the complex gain lookup table technique, the power of the envelope signal of the input RF signal is used as the index value of the lookup table, and the control signal of the vector modulator is obtained, which is used to adjust the amplitude and phase of the input RF signal. The linearization effect is verified by the simulation of the system. The gain compression of the power amplifier is improved by 0.8 dB, phase expansion and improved by 10.3 掳. Using a dual tone signal with an interval of 1 MHz, the IMD3 improvement is about 32 dB,IMD5 and the improvement is about 18 dB. Using a dual tone signal at intervals of 2 MHz, the IMD3 improvement is about 27 dB,IMD5 and the improvement is about 15 dB. Using a 3.84 MHz CDMA2000 modulation signal, the linearized ACPR improved by 15 dB. For the hybrid linearization system, a digital control vector modulator based on 0.13 渭 m CMOS process is designed in this paper, and the circuit schematic and layout are designed. The whole chip size is 1080 渭 m-886 渭 m. The performance of the circuit is verified by pre-simulation and post-simulation, and the linearization performance is preliminarily verified. The vector modulator is controlled by the 10-bits digital signal, the power supply voltage is 1.2V, the static power consumption of the circuit is 17.5 mW, the input and output ports match well (S11 is less than-22dB, S22 is less than-13 dB). The realizable gain adjustment range is 11 dB, the phase adjustment range is 61 掳, and the noise figure is less than 13.2 dB..
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN432;TN761
本文编号：2444202
[Abstract]:At present, the wireless communication system is developing to the form of heterogeneous network, which introduces the need of macro base station and small base station. Macro base stations realize wide area coverage. In the blind spots of macro base stations and hot spots with large data traffic, small base stations are used to supplement coverage and improve network capacity. Compared with macro base station, the transmission power and coverage range of small base station is smaller than that of macro base station. However, the nonlinearity of power amplifier in base station has not been reduced correspondingly. The linearization technique is still needed to make the power amplifier meet the linearity requirement of the peak-to-average ratio (PAPR) signal transmission. Digital pre-distortion technology (DPD) has the advantages of superior performance and simple structure of analog pre-distortion (APD), while digital-analog hybrid linearization technology combines the advantages of both, and has lower power consumption than DPD and higher linearization ability than APD. Because of these characteristics, digital-analog hybrid linearization technology will be the main content of this paper. In the verification of the hybrid linearization technique, the memoryless polynomial is selected as the model of the predistorter. Based on the complex gain lookup table technique, the power of the envelope signal of the input RF signal is used as the index value of the lookup table, and the control signal of the vector modulator is obtained, which is used to adjust the amplitude and phase of the input RF signal. The linearization effect is verified by the simulation of the system. The gain compression of the power amplifier is improved by 0.8 dB, phase expansion and improved by 10.3 掳. Using a dual tone signal with an interval of 1 MHz, the IMD3 improvement is about 32 dB,IMD5 and the improvement is about 18 dB. Using a dual tone signal at intervals of 2 MHz, the IMD3 improvement is about 27 dB,IMD5 and the improvement is about 15 dB. Using a 3.84 MHz CDMA2000 modulation signal, the linearized ACPR improved by 15 dB. For the hybrid linearization system, a digital control vector modulator based on 0.13 渭 m CMOS process is designed in this paper, and the circuit schematic and layout are designed. The whole chip size is 1080 渭 m-886 渭 m. The performance of the circuit is verified by pre-simulation and post-simulation, and the linearization performance is preliminarily verified. The vector modulator is controlled by the 10-bits digital signal, the power supply voltage is 1.2V, the static power consumption of the circuit is 17.5 mW, the input and output ports match well (S11 is less than-22dB, S22 is less than-13 dB). The realizable gain adjustment range is 11 dB, the phase adjustment range is 61 掳, and the noise figure is less than 13.2 dB..
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN432;TN761
【参考文献】
相关硕士学位论文 前3条
1 周睿;毫米波模拟预失真线性化技术研究[D];电子科技大学;2013年
2 曹萍;基于矢量信号处理的射频功放预失真技术研究[D];电子科技大学;2012年
3 马岳林;基于多项式求逆的数字预失真技术研究和测试验证[D];电子科技大学;2011年
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