使用左右手傳輸線設計雙頻帶Doherty功率放大器

Dual band Doherty power amplifier using CRLH transmission lines.

李忠倫(Chung-Lun Lee)

指導教授 ： 盧信嘉

國立臺灣大學/電機資訊學院/電子工程學研究所/碩士(2014年)

https://doi.org/10.6342/NTU.2014.01873

摘要

本論文介紹一種新的架構，搭配左右手傳輸線方式，設計和實現雙頻帶E-pHEMTs Doherty 功率放大器。在用左右手傳輸線的架構取代傳統用於 波長傳輸線的地方。比起傳統T型網絡或雙頻耦合線，左右手傳輸線有著較簡潔的電路架構。
不單是傳輸線部分，在功率分配器和單元功率放大器上也需要做雙頻帶的設計。左右手傳輸線和其餘部分合成雙頻帶Doherty功率放大器操作於0.85和1.9GHz上。本論文分別使用表面附著元件和低溫共燒陶瓷作為匹配網絡和左右手實現的部分。模擬結果在雙頻帶上可得到功率附加效益分別為52.7%和35.7%。而在功率退回區也可以達到35%的功率附加效益。而且在兩頻帶上也分別有10dB和6dB的增益量。在0.85和1.9GHz上平均也可以達到28dBm的輸出功率。

關鍵字

Doherty功率放大器 ； 包絡峰/均功率比(PAPR) ； 左右手傳輸線 ； 高速電子移動電晶體(HEMT)

並列摘要

This thesis presents a new design implementation and experimental results of a dual-band E-pHEMTs Doherty power amplifier (DPA) using composite right/left-handed transmission line (CRLH-TL). The transmission line incorporating CRLH-TL is designed to replace those realized by conventional transmission lines. Compared to T-shape network or dual-band coupled line, the proposed CRLH-TL DPA has more compact circuit structure.
In addition to the transmission line, the power divider and the PA unit cell also shall be in the dual-band operation. The proposed CRLH-TL is applied to implement a dual-band DPA for the frequency bands at 0.85 and 1.9 GHz. This thesis uses both surface mount devices and low temperature co-fired ceramic (LTCC) for the matching network and the CRLH-TL implementation. Simulation results for power added efficiency (PAE) are 35.7% and 52.7% for the two frequencies. The PAE at back-off output power exceeds 35% for both bands. The gains at the two frequencies are 10dB and 6.6dB, respectively. The output power can be achieved at average of 28dBm at both 0.85 and 1.9GHz.

並列關鍵字

Doherty power amplifier (DPA) ； peak-to-average power ratio (PAPR) ； composite right/left-handed transmission line (CRLH-TL) ； dual band amplifier

參考文獻

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