PA Efficiency and Linearity Enhancement Using External Harmonic Injection

被引：36

作者：

Dani, Asmita ^{[1
]}

Roberg, Michael ^{[2
]}

Popovic, Zoya ^{[1
]}

机构：

[1] Univ Colorado, Dept Elect Comp & Energy Engn, Boulder, CO 80309 USA

[2] TriQuint Semicond, Richardson, TX 75080 USA

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2012年 / 60卷 / 12期

关键词：

Amplifier drain efficiency; Fourier coefficients; harmonics; linearity; microwave power amplifiers (PAs); third-order intercept; waveform shaping; POWER-AMPLIFIER; RF;

D O I：

10.1109/TMTT.2012.2222918

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper presents analysis and experimental demonstration of a high-efficiency linear power amplifier (PA) with second-harmonic injection at the output. In this circuit, the transistor is not driven hard into compression and does not produce significant harmonic content. External injection at the output enables voltage and current wave-shaping to achieve high efficiency. Theoretical analysis of the waveforms shows that the maximal drain efficiency is 89.9% with, at most, 0.13 dB of reduction in output power compared with the class-A case. The overall PA efficiency is derived in terms of the injector circuit efficiency. A harmonically injected prototype GaN HEMT 2.45-GHz PA demonstrates over 80% efficiency with linearity improved over the class-AB PA without harmonic injection. Two-tone measurements show a reduction of the third-order intermodulation by -30 dBc in the linear region and greater than -10 dBc in saturation.

引用

页码：4097 / 4106

页数：10

共 21 条

[1] Improvement of third-order intermodulation product of RF and microwave amplifiers by injection [J].

Aitchison, CS ;

Mbabele, M ;

Moazzam, MR ;

Budimir, D ;

Ali, F .

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2001, 49 (06) :1148-1154

[2]

AlMuhaisen A, 2011, EUR MICROW INTEGRAT, P184

[3]

AlMuhaisen A, 2010, IEEE MTT S INT MICR, P664, DOI 10.1109/MWSYM.2010.5514759

[4]

Bae HR, 2010, EUR MICROW CONF, P1042

[5]

Bahl I.J., 2009, Fundamental of RF and Microwave Transistor Amplifiers, P332

[6]

Dani A., 2012, 2012 IEEE/MTT-S International Microwave Symposium Digest, P1

[7] Signals with flattened extrema in balance power analysis of HFHPTA: Theory and applications [J].

Juhas, A ;

Novak, LA ;

Kostic, S .

IEEE TRANSACTIONS ON BROADCASTING, 2001, 47 (01) :38-45

[8] The class-E/F family of ZVS switching amplifiers [J].

Kee, SD ;

Aoki, I ;

Hajimiri, A ;

Rutledge, D .

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2003, 51 (06) :1677-1690

[9]

Kenington P.B., 2000, ARTECH MICR, P21

[10] Load-impedance and bias-network dependence of power amplifier with second harmonic injection [J].

Kusunoki, S ;

Kawakami, K ;

Hatsugai, T .

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 2004, 52 (09) :2169-2176

← 1 2 3 →