Multiband and Multimode Concurrent PA With Novel Intermodulation Tuning Network for Linearity Improvement

Multiband and Multimode Concurrent PA With Novel Intermodulation Tuning Network for Linearity Improvement
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多频段和多模式并发 PA,具有新颖的互调调谐网络,可改善线性度

DOI:
10.1109/lmwc.2018.2794819
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发表时间:
2018-02
影响因子:
3
通讯作者:
Feng Zhenghe
Feng Zhenghe
中科院分区:
工程技术2区
文献类型:
--
作者:
Li Jing;Chen Wenhua;Huang Fei;Feng Zhenghe

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对于多频段功率放大器(PAS),漏极二阶互调频率的高阻抗会导致并发模式下严重的非线性失真。针对这一问题,本文提出了一种新型互调调谐网络(IMTN)。IMTN与输出匹配网络并联,在低频下具有多个阻抗零点。因此,即使功放的两个工作频段的频差相对较大,线性度的改善也是明显的。对三组双频10 MHz LTE调制信号进行了实验测量,载频分别为1.8/2.1 GHz、2.1/2.6 GHz和1.8/2.6 GHz。在具有500 MHz频差的模式2中,与没有IMTN的传统功放相比,邻道功率比提高了6d B;在具有800 MHz频差的模式3中,与低通IMTN相比,邻道功率比提高了3d B。在总输出功率为35dBm时,三种模式的平均效率分别为40.3%、36.4%和37.6%。
For multiband power amplifiers (PAs), high impedance at the second-order intermodulation frequencies at the drain can result in severe nonlinear distortion in concurrent mode. To solve this problem, a novel intermodulation tuning network (IMTN) is proposed in this letter. The IMTN is in parallel to the output matching network and has multiple impedance zeros at low frequencies. Therefore, the improvement in linearity is evident even if the frequency difference of two operating bands of PA is relatively large. Experimental measurement is carried out with three sets of dual-band 10-MHz LTE modulated signals, and the carrier frequencies are 1.8/2.1, 2.1/2.6, and 1.8/2.6 GHz, respectively. In mode 2 with 500-MHz frequency difference, the adjacent channel power ratio is improved by 6 dB compared with the conventional PA without IMTN, and in mode 3 with 800-MHz frequency difference, 3 dB is improved compared with low-pass IMTN. The measured average efficiencies of three modes are 40.3%, 36.4% and 37.6%, respectively, at 35-dBm total output power.
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