基于CMOS的移动终端高能效功率放大器研究与设计

发布时间：2018-03-23 12:53

本文选题：线性功率放大器　切入点：数控功放　出处：《中国科学技术大学》2015年硕士论文

【摘要】：功率放大器是整个收发机系统中主要的耗能模块且有较大的非线性失真,直接影响着设备的待机时间和所能支持的通信速率,因此高能效高线性度的CMOS功放设计一直是国内外研究的热点。 CMOS工艺由于其高的衬底损耗、低的击穿电压以及各种寄生电容给大功率线性功放设计带来了很大的挑战,特别是应用于移动终端的功放,近年来高通等公司已经相继推出了相应的CMOS功放产品,实现了不错的性能。本文第一部分设计了一种高线性度高效率CMOS线性功放,对CMOS功放的可靠性和非线性来源进行了深入的分析,并给出了相应的解决方案,芯片绑线以及PCB走线等都用HFSS进行了建模优化。该线性功放采用TSMC0.18um工艺设计,后仿输出功率1dB压缩点P1dB为25.3dBm,在P1dB处功率附加效率PAE接近33%。在ADS的WLAN802.11g仿真平台里,输入64QAM信号,该功放满足其频谱掩膜和EVM要求的最大线性输出功率为15dBm,说明功放具有很好的线性度。由于目前通信通常采用高阶的幅度调制信号,为了满足其线性度要求,功放必须采用功率回退的方式,这样会造成效率的降低。而数控类功放可以实现效率和线性度之间更好的权衡。本文第二部分对数控类功放进行了研究,对数控功放的版图进行优化,并采用了新型的二次谐波电流抑制电路和改进型的LO驱动电路,设计了两种高效率的数控功放：(1)针对蓝牙v4.0应用设计了一种6位数控式功放,采用TSMC0.18um工艺,后仿输出功率为4.3dBm,效率为35%,功放的动态范围超过26dB,可以支持蓝牙v4.0的EDR模式；(2)设计了一种应用于WLAN802.11g的大功率8位数控的逆D类功放,使用SMIC65nm工艺,后仿结果显示,在2.4GHz处的峰值输出功率为26.1dBm,主功放的漏端效率约为42%,输出功率变化低于1dB的带宽为900MHz。论文第三部分设计了一种应用于综合功率控制器的有源巴伦,加入了三级校正电路、带宽补偿电路和温度补偿电路,并对开关管的可靠性和非线性进行了分析讨论。后仿结果显示,在1.9-2.6GHz带宽内输出差分信号幅度误差控制在0.2dB以内,相位误差控制在1°以内。通过带宽补偿技术使整个功率控制器系统的增益变化低于1dB的带宽大于1GHz。
[Abstract]:Power amplifier is the main energy dissipation module in the whole transceiver system and has large nonlinear distortion, which directly affects the standby time of the equipment and the communication rate that can be supported. Therefore, the design of CMOS power amplifier with high energy efficiency and high linearity has been a hot spot at home and abroad. Because of its high substrate loss, low breakdown voltage and various parasitic capacitors, CMOS process brings great challenges to the design of high power linear power amplifier, especially for mobile terminal. In recent years, Qualcomm and other companies have introduced corresponding CMOS power amplifier products, which have achieved good performance. In the first part of this paper, a high linearity and high efficiency CMOS linear power amplifier is designed. The reliability and nonlinear sources of CMOS power amplifier are analyzed in depth, and the corresponding solutions are given. HFSS is used to model and optimize the chip wire binding and PCB wiring. The linear power amplifier is designed by TSMC0.18um process. The post-output power 1dB compression point P1dB is 25.3 dBm, and the additional power efficiency PAE is close to 33 at P1dB. In the WLAN802.11g simulation platform of ADS, the 64QAM signal is input. The maximum linear output power of this amplifier is 15dBm, which meets the requirements of spectrum mask and EVM, which indicates that the amplifier has good linearity. At present, high order amplitude modulation signal is usually used in communication, in order to meet the linearity requirement, power amplifier must adopt the way of power back. This will result in the reduction of efficiency. The CNC power amplifier can achieve a better trade-off between efficiency and linearity. In the second part of this paper, the numerical control power amplifier is studied, and the layout of the numerical control power amplifier is optimized. A new second harmonic current suppression circuit and an improved Lo drive circuit are used to design two kinds of high efficiency CNC power amplifier: 1) for Bluetooth v4.0 application, a 6-bit numerical control power amplifier is designed, and the TSMC0.18um process is adopted. The output power is 4.3 dBm, the efficiency is 35, the dynamic range of power amplifier is more than 26dB, and the EDR mode can support Bluetooth v4.0. A kind of high power 8-bit NC inverse D power amplifier applied to WLAN802.11g is designed. The SMIC65nm technology is used. The result shows that, The peak output power at 2.4GHz is 26.1 dBm.The leakage efficiency of the main power amplifier is about 42 and the output power change is lower than the bandwidth of 1dB is 900MHz. In the third part of the thesis, we design a kind of active Barron which is applied to the integrated power controller, and add the three-level correction circuit, the bandwidth compensation circuit and the temperature compensation circuit. The reliability and nonlinearity of the switch are analyzed and discussed. The post-simulation results show that the amplitude error of the output differential signal in the 1.9-2.6GHz bandwidth is controlled within the 0.2dB. The phase error is controlled within 1 掳. The gain change of the whole power controller system is lower than that of 1dB with bandwidth compensation technique greater than 1 GHz.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN722.75

【共引文献】