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首页> 外文期刊>International Journal of Microwave and Wireless Technologies >Highly efficient 3-stage Doherty power amplifier using gate bias adaption
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Highly efficient 3-stage Doherty power amplifier using gate bias adaption

机译：利用栅极偏置自适应的高效3级Doherty功率放大器

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This paper demonstrates a highly efficient 3-stage Doherty power amplifier (PA) employing an envelope tracking (ET) tech nique. The '3-stage' Doherty PA is the most efficient architecture for a high peak-to-average power ratio (PAPR) signal among the various Doherty PAs. However, because of the lower peaking biases than those of the 'N-way'Doherty PA, the proper load modulation is hard to be achieved. To get proper modulation, the peaking PAs' gate biases have been adaptively controlled using the ET technique, and the peak power and maximum efficiency characteristic along the backed-off output power region is successfully achieved. By ADS and Matlab simulations, the overall behavior of the 3-stage Doherty PA employing the ET technique has been fully analyzed. To maximize the overall efficiency of the proposed 3-stage Doherty PA, the unit PA has been designed using class F～(-1) PA. For verification, the amplifier is implemented using 5 W and 10 W PEP LDMOSFETs for the 802.16e mobile world interoperability for microwave access (WiMAX) at 1 GHz with a 8.5 dB PAPR. The measured drain efficiency of the proposed 3-stage Doherty PA is 55.5% at an average output power of 37 dBm, which is a 7.54 dB backed-off output power. The digital feedback predistortion (DFBPD) algorithm has been used to linearize the proposed PA considering the ET technique. After linearization, the —33.15 dB of relative constellation error (RCE) performance is achieved, satisfying the system specification. These results show that the 3-stage Doherty employing the ET technique and saturated PA is the most suitable PA for the highly efficient and linear transmitter.
机译：本文演示了采用包络跟踪（ET）技术的高效3级Doherty功率放大器（PA）。 “三级” Doherty PA是各种Doherty PA中最高峰均功率比（PAPR）信号的最有效架构。但是，由于峰值偏置比“ N路” Doherty PA更低，因此很难实现适当的负载调制。为了获得适当的调制，已使用ET技术自适应地控制了峰值PA的栅极偏置，并成功实现了沿后退输出功率区域的峰值功率和最大效率特性。通过ADS和Matlab仿真，已充分分析了采用ET技术的3级Doherty PA的整体性能。为了使所提出的三级Doherty PA的整体效率最大化，已使用F〜（-1）PA类设计了单元PA。为了进行验证，该放大器使用5 W和10 W PEP LDMOSFET来实现802.16e移动世界的互操作性，以在1 GHz时具有8.5 dB PAPR的微波接入（WiMAX）。建议的三级Doherty PA在37 dBm的平均输出功率下测得的漏极效率为55.5％，这是7.54 dB的后退输出功率。考虑到ET技术，已使用数字反馈预失真（DFBPD）算法来线性化建议的PA。线性化后，达到了–33.15 dB的相对星座误差（RCE）性能，满足了系统规范。这些结果表明，采用ET技术和饱和PA的3级Doherty是最适合高效线性发射机的PA。

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