TY - GEN
T1 - Linearization of CMOS triple cascode push-pull power amplifiers by second harmonic feedback
AU - Terajima, Kazuma
AU - Fujii, Kenichi
AU - Sonoda, Takuji
AU - Takagi, Tadashi
AU - Nakayama, Eita
AU - Kameda, Suguru
AU - Suematsu, Noriharu
AU - Tsubouchi, Kazuo
PY - 2014/3/25
Y1 - 2014/3/25
N2 - A linearity enhancement technique to a CMOS triple cascode push-pull power amplifier (PA) by second harmonic feedback has been proposed. The Second harmonic feedback is optimized to improve linearity based on the concept that the linearity is depend on the second harmonic feedback amplitude and phase. In order to feed second harmonics back to the push-pull PAs, we adopt a balun with a branching filter fabricated by using multi-layered organic substrates. The PA was fabricated in 0.18-μm CMOS process and was implemented on the balun by flip-chip connection. Because of the low breakdown voltage of CMOS power transistors, triple cascode configuration was adapted. It has been demonstrated that using second harmonic feedback, PAE and output power with a wideband code division multiple access (WCDMA) modulated signal are improved by 5.3% and 2.5dB respectively at adjacent channel leakage power ratio (ACLR) of -39dBc, and it has been demonstrated PAE of 28.8% and output power of 24.5dBm, respectively.
AB - A linearity enhancement technique to a CMOS triple cascode push-pull power amplifier (PA) by second harmonic feedback has been proposed. The Second harmonic feedback is optimized to improve linearity based on the concept that the linearity is depend on the second harmonic feedback amplitude and phase. In order to feed second harmonics back to the push-pull PAs, we adopt a balun with a branching filter fabricated by using multi-layered organic substrates. The PA was fabricated in 0.18-μm CMOS process and was implemented on the balun by flip-chip connection. Because of the low breakdown voltage of CMOS power transistors, triple cascode configuration was adapted. It has been demonstrated that using second harmonic feedback, PAE and output power with a wideband code division multiple access (WCDMA) modulated signal are improved by 5.3% and 2.5dB respectively at adjacent channel leakage power ratio (ACLR) of -39dBc, and it has been demonstrated PAE of 28.8% and output power of 24.5dBm, respectively.
KW - Adjacent channel leakage power ratio (ACLR)
KW - Balun
KW - CMOS power amplifiers (PA)
KW - Harmonic feedback
KW - Linearity
KW - Planar balun
KW - Wideband code division multiple access (WCDMA)
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M3 - Conference contribution
AN - SCOPUS:84988253851
T3 - 2014 Asia-Pacific Microwave Conference Proceedings, APMC 2014
SP - 107
EP - 109
BT - 2014 Asia-Pacific Microwave Conference Proceedings, APMC 2014
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2014 Asia-Pacific Microwave Conference, APMC 2014
Y2 - 4 November 2014 through 7 November 2014
ER -