WCDMA高效线性功放研究
发布时间：2018-07-22 19:49
【摘要】：无线移动通信的高速发展，对通信基站的性能提出了更高的要求，新一代通信中复杂的调制方式及功率峰均比(PPAR)使得功放需具备良好的线性度，而激烈的成本竞争使得功放的高效率成了各电信运营商追求的共同目标，因此高效线性功放成为新一代及下一代通信基站发展的必然趋势。 本文在分析WCDMA高效线性功放设计技术的基础上，设计了具有数控衰减模块、高效率功放模块和预失真模块的高效线性功放，主要设计工作如下： (1)数控衰减模块采用了Hittite公司的数控衰减器HMC624，其输出功率经功率检测芯片AD8314检测后将功率信号转换为模拟电压信号，再由ATmega32单片机进行模数转换(ADC)转换并用C语言程序实时地控制数控衰减器(DA)的衰减量，实现步进0.5dB，0~31.5dB的衰减范围，控制系统增益大小，避免输入功率过大造成器件损坏； (2)高效率功放模块采用了NXP公司的LDMOS功放管，由驱动功放BLF6G2110及Doherty末级功放BLF6G2240构成，实现了系统增益为31dB，8dB功率回退点38dBm对应的效率有28%，线性度ACPR约为-29.8dBc。P1dB达到44.7dBm，，该功率点的功率附加效率为43.3%。 (3)预失真模块采用了Scintera公司的SC1889射频预失真方案，预失真芯片采集输入信号及输出反馈信号，进行预失真处理后产生预失真信号，进而由功放模块进行放大处理，线性度提高了11dB。 (4)基于以上模块设计了WCDMA高效线性功放系统，其体积为6cm*19cm*2cm。测试结果显示，该功放系统的平均输出功率为38dBm时，功率附加效率为25%，线性度ACPR为-41dBc。增益衰减范围达31.5dB，步进0.5dB。该功放实现了功放小型化、低功耗、高效率、高线性的目标。
[Abstract]:With the rapid development of wireless mobile communication, the performance of communication base station is required to be higher. The complex modulation mode and PPAR in the new generation communication make the power amplifier have good linearity. The fierce cost competition makes the high efficiency of power amplifier become the common goal of the telecom operators, so the efficient linear power amplifier becomes the inevitable trend of the development of the new generation and the next generation communication base station. Based on the analysis of WCDMA high efficiency linear power amplifier design technology, this paper designs an efficient linear power amplifier with numerical control attenuation module, high efficiency power amplifier module and predistortion module. The main design works are as follows: (1) the numerical control attenuator HMC624 of Hittite Company is used in the numerical control attenuation module. The output power is converted into analog voltage signal after the power detection chip AD8314 detects the output power. Then ATmega32 single chip computer is used to convert ADC and C language program to control the attenuation of the digital control attenuator (DA) in real time, realize the attenuation range of 0.5dBU / 31.5dB, control the gain of the system, and avoid the device damage caused by the excessive input power. (2) the high efficiency power amplifier module adopts the LDMOS power amplifier of NXP, which is composed of BLF6G2110 and Doherty final amplifier BLF6G2240. The system gain of 31dBU 8dB power fallback point corresponding to 38dBm is 28dBm, the linearity ACPR is about -29.8dBc.P1dB and the power additional efficiency of this power point is 43.3dBm. (3) the SC1889 radio frequency predistortion scheme of Scintera company is used in the predistortion module, and the linear degree ACPR is about -29.8dBc.P1dB and 44.7dBm. (3) the SC1889 radio frequency predistortion scheme of Scintera is used in the predistortion module. The predistortion chip collects input signal and output feedback signal, and produces predistortion signal after pre-distortion processing, and then amplifies the signal by power amplifier module. The linearity is improved by 11 dB. (4) based on the above modules, an efficient linear power amplifier system for WCDMA is designed, the volume of which is 6 cm / 19 cm ~ (2). The test results show that when the average output power of the power amplifier is 38 dBm, the power addition efficiency is 25 and the linearity ACPR is -41 dBc. The gain attenuation range is 31.5 dB and the step is 0.5 dB. This amplifier achieves the goal of miniaturization, low power consumption, high efficiency and high linearity.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.53
本文编号：2138381
[Abstract]:With the rapid development of wireless mobile communication, the performance of communication base station is required to be higher. The complex modulation mode and PPAR in the new generation communication make the power amplifier have good linearity. The fierce cost competition makes the high efficiency of power amplifier become the common goal of the telecom operators, so the efficient linear power amplifier becomes the inevitable trend of the development of the new generation and the next generation communication base station. Based on the analysis of WCDMA high efficiency linear power amplifier design technology, this paper designs an efficient linear power amplifier with numerical control attenuation module, high efficiency power amplifier module and predistortion module. The main design works are as follows: (1) the numerical control attenuator HMC624 of Hittite Company is used in the numerical control attenuation module. The output power is converted into analog voltage signal after the power detection chip AD8314 detects the output power. Then ATmega32 single chip computer is used to convert ADC and C language program to control the attenuation of the digital control attenuator (DA) in real time, realize the attenuation range of 0.5dBU / 31.5dB, control the gain of the system, and avoid the device damage caused by the excessive input power. (2) the high efficiency power amplifier module adopts the LDMOS power amplifier of NXP, which is composed of BLF6G2110 and Doherty final amplifier BLF6G2240. The system gain of 31dBU 8dB power fallback point corresponding to 38dBm is 28dBm, the linearity ACPR is about -29.8dBc.P1dB and the power additional efficiency of this power point is 43.3dBm. (3) the SC1889 radio frequency predistortion scheme of Scintera company is used in the predistortion module, and the linear degree ACPR is about -29.8dBc.P1dB and 44.7dBm. (3) the SC1889 radio frequency predistortion scheme of Scintera is used in the predistortion module. The predistortion chip collects input signal and output feedback signal, and produces predistortion signal after pre-distortion processing, and then amplifies the signal by power amplifier module. The linearity is improved by 11 dB. (4) based on the above modules, an efficient linear power amplifier system for WCDMA is designed, the volume of which is 6 cm / 19 cm ~ (2). The test results show that when the average output power of the power amplifier is 38 dBm, the power addition efficiency is 25 and the linearity ACPR is -41 dBc. The gain attenuation range is 31.5 dB and the step is 0.5 dB. This amplifier achieves the goal of miniaturization, low power consumption, high efficiency and high linearity.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.53
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2 谷涛;;数控衰减器在雷达DAGC系统中的应用[J];现代电子技术;2009年16期
本文编号：2138381
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