A Multimode/Multiband Power Amplifier With a Boosted Supply Modulator

Kang, Daehyun; Kim, Dong–Su; Choi, Jinsung; Kim, Jooseung; Cho, Yunsung; Kim, Bumman

doi:10.1109/tmtt.2010.2063851

Cited by 71 publications

(30 citation statements)

References 21 publications

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“…In WCDMA handset application, the supply modulator consist of a class-D switching amplifier, developed on a CMOS platform to improve the efficiency of a linear class-AB PA [46], where the Class AB PA is realized utilizing GaAs HFET process. Other reported work utilizes GaAs HBT process to develop the PA and CMOS process to realize the supply modulator [47,48]. This dual chip solution is proven to work efficiently and linearly for high peak to average energy ratio signals such as LTE, covering wideband operation [49,50].…”

Section: Envelope Tracking (Et)mentioning

confidence: 99%

“…Consequently, in order to further boost up the efficiency on the linear PA, the ET technique is utilized. In [50], with a CMOS digital supply modulator, a high PAE of 43% has been achieved whereas in [48], the wideband PAE is further improved as compared to single chip GaAs HBT in [39]. On the other hand, the DPD method is used to linearize a non-linear switching PA with PAE of 48% in [22].…”

Section: Performance Comparisonmentioning

confidence: 99%

See 1 more Smart Citation

Energy saving power amplifier design methodologies for mobile wireless communications

Eswaran

Ramiah

Kanesan

et al. 2015

Renewable and Sustainable Energy Reviews

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Section: Envelope Tracking (Et)mentioning

confidence: 99%

Section: Performance Comparisonmentioning

confidence: 99%

Energy saving power amplifier design methodologies for mobile wireless communications

Eswaran

Ramiah

Kanesan

et al. 2015

Renewable and Sustainable Energy Reviews

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“…These methods have gained popularity and are reported in several distinguished implementations [3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…The Doherty PA, consisting of 2 amplifiers connected in parallel, employs the load modulation technique to enhance the efficiency at the back-off output power [3][4][5][6]. A quarter-wave transformer is used to modulate the load in improving the efficiency and third-order intermodulation distortion (IMD3) cancellation between the main and auxiliary amplifiers, paving into the linearity enhancement [7]. The implementation and integration of an on-chip quarter-wave transformer will substantially increase the die size.…”

Section: Introductionmentioning

confidence: 99%

Class-E GaAs HBT power amplifier with passive linearization scheme for mobile wireless communications

Uthirajoo¹,

Ramiah²,

Kanesan³

et al. 2014

Turk J Elec Eng & Comp Sci

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Abstract:A linearization technique for improving the class-E power amplifier (PA)'s adjacent channel power ratio (ACPR) is proposed. The design is simulated in a 2-µ m InGaP/GaAs heterojunction bipolar transistor process. The integration of a passive predistorter at the input of the PA linearizes the proposed architecture. At a 29-dBm output power, the PA's ACPR is indicated to be -51 dBc, meeting the stringent code division multiple access regulation. At this exact output power, the simulated power added efficiency is 55% with the collector voltage headroom consumption of 3.4 V. The input return loss, S11, of the PA is simulated as -12.5 dB. With an active finger print dimension of 1000 µ m × 750 µ m, the proposed PA is well suited for the application of mobile wireless communication.

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“…The envelope-tracking power amplifier (ET PA) is another popular efficiency enhancement technique [5]- [7]. To reduce the dc power consumption, it modulates the supply voltage of the PA according to the input power level.…”

Section: Introductionmentioning

confidence: 99%

A low/high-mode power amplifier with envelope-tracking operation

Cho

Kang

Kim

et al. 2012

2012 IEEE/MTT-S International Microwave Symposium Digest

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This paper presents a low/high-mode power am plifier (PA) for long term evolution (LTE) applications that improves the efficiency in low-power regions. This PA operates in two modes through path control by a shunt switched-capacitor. We use an LTE signal at 1.71 GHz with 16-quadrature ampli tude modulation (QAM), 6.44-dB peak-to-average power ratio (PAPR), and a 10-MHz bandwidth (BW). The dual-path PA with a boosted supply modulator for the envelope-tracking (ET) operation exhibits a power-added efficiency (PAE) of 39.9% and an adjacent channel leakage ratio (ACLR)E-UTRA of -35.7 dBc at an average output power of 27 dBm. The dual-path PA also delivers a PAE of 30.3%, and ACLRE-UTRA of -32.8 dBc at an average output power of 15.5 dBm. Index Terms-Dual mode, envelope tracking (ET), high power mode (HPM), long term evolution (LTE), low power mode (LPM), power amplifier (PA), supply modulator (SM), switched capacitor.

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A Multimode/Multiband Power Amplifier With a Boosted Supply Modulator

Cited by 71 publications

References 21 publications

Energy saving power amplifier design methodologies for mobile wireless communications

Energy saving power amplifier design methodologies for mobile wireless communications

Class-E GaAs HBT power amplifier with passive linearization scheme for mobile wireless communications

A low/high-mode power amplifier with envelope-tracking operation

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