【摘要】：無線移動(dòng)通信的高速發(fā)展，對(duì)通信基站的性能提出了更高的要求，新一代通信中復(fù)雜的調(diào)制方式及功率峰均比(PPAR)使得功放需具備良好的線性度，而激烈的成本競爭使得功放的高效率成了各電信運(yùn)營商追求的共同目標(biāo)，因此高效線性功放成為新一代及下一代通信基站發(fā)展的必然趨勢。 本文在分析WCDMA高效線性功放設(shè)計(jì)技術(shù)的基礎(chǔ)上，設(shè)計(jì)了具有數(shù)控衰減模塊、高效率功放模塊和預(yù)失真模塊的高效線性功放，主要設(shè)計(jì)工作如下： (1)數(shù)控衰減模塊采用了Hittite公司的數(shù)控衰減器HMC624，其輸出功率經(jīng)功率檢測芯片AD8314檢測后將功率信號(hào)轉(zhuǎn)換為模擬電壓信號(hào)，再由ATmega32單片機(jī)進(jìn)行模數(shù)轉(zhuǎn)換(ADC)轉(zhuǎn)換并用C語言程序?qū)崟r(shí)地控制數(shù)控衰減器(DA)的衰減量，實(shí)現(xiàn)步進(jìn)0.5dB，0~31.5dB的衰減范圍，控制系統(tǒng)增益大小，避免輸入功率過大造成器件損壞； (2)高效率功放模塊采用了NXP公司的LDMOS功放管，由驅(qū)動(dòng)功放BLF6G2110及Doherty末級(jí)功放BLF6G2240構(gòu)成，實(shí)現(xiàn)了系統(tǒng)增益為31dB，8dB功率回退點(diǎn)38dBm對(duì)應(yīng)的效率有28%，線性度ACPR約為-29.8dBc。P1dB達(dá)到44.7dBm，，該功率點(diǎn)的功率附加效率為43.3%。 (3)預(yù)失真模塊采用了Scintera公司的SC1889射頻預(yù)失真方案，預(yù)失真芯片采集輸入信號(hào)及輸出反饋信號(hào)，進(jìn)行預(yù)失真處理后產(chǎn)生預(yù)失真信號(hào)，進(jìn)而由功放模塊進(jìn)行放大處理，線性度提高了11dB。 (4)基于以上模塊設(shè)計(jì)了WCDMA高效線性功放系統(tǒng)，其體積為6cm*19cm*2cm。測試結(jié)果顯示，該功放系統(tǒng)的平均輸出功率為38dBm時(shí)，功率附加效率為25%，線性度ACPR為-41dBc。增益衰減范圍達(dá)31.5dB，步進(jìn)0.5dB。該功放實(shí)現(xiàn)了功放小型化、低功耗、高效率、高線性的目標(biāo)。
[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.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.53

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本文編號(hào)：2138381