High Efficiency Two‐Stage Unbalanced Doherty Power Amplifier for Lte Applications

Jang, Dong-Hee; Kim, Jiyeon; Kim, Jong‐Heon

doi:10.1002/mop.27760

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…For the two-stage PA, the inter-stage matching network should be carefully designed [9][10][11]. The matching network transforms the input impedance of the 2nd-stage to the load impedance of the 1st-stage.…”

Section: Mmic Designmentioning

confidence: 99%

2.6 GHz GaN-HEMT Power Amplifier MMIC for LTE Small-Cell Applications

Lim¹,

Lee²,

Kang³

et al. 2016

JSTS:Journal of Semiconductor Technology and Science

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Abstract-This paper presents a two-stage power amplifier MMIC using a 0.4 μm GaN-HEMT process. The two-stage structure provides high gain and compact circuit size using an integrated inter-stage matching network. The size and loss of the inter-stage matching network can be reduced by including bond wires as part of the matching network. The two-stage power amplifier MMIC was fabricated with a chip size of 2.0×1.9 mm 2 and was mounted on a 4×4 QFN carrier for evaluation. Using a downlink LTE signal with a PAPR of 6.5 dB and a channel bandwidth of 10 MHz for the 2.6 GHz band, the power amplifier MMIC exhibited a gain of 30 dB, a drain efficiency of 32%, and an ACLR of -31.4 dBc at an average output power of 36 dBm. Using two power amplifier MMICs for the carrier and peaking amplifiers, a Doherty power amplifier was designed and implemented. At a 6 dB back-off output power level of 39 dBm, a gain of 24.7 dB and a drain efficiency of 43.5% were achieved.

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Section: Mmic Designmentioning

confidence: 99%

2.6 GHz GaN-HEMT Power Amplifier MMIC for LTE Small-Cell Applications

Lim¹,

Lee²,

Kang³

et al. 2016

JSTS:Journal of Semiconductor Technology and Science

View full text Add to dashboard Cite

show abstract

“…However, one of the common problems with conventional DPAs is that the power added efficiency (PAE) is not satisfactory at low power RF input ; therefore, to improve the PAE of DPAs is one of the hottest research areas in PA designs. One of the direct ways to enchance PAE is employing N‐way ( N > 2) or multistage structures, but the circuits' complexity and fabrication cost can sometimes be greatly increased. Moreover, linearity can be deteriorated using multiple PAs.…”

Section: Introductionmentioning

confidence: 99%

Design of a DPA based on the dual‐level supply voltage modulation for efficiency improvement

Cao

Tang

Wang

2016

Micro & Optical Tech Letters

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150 C. Dielectric characteristics of the substrate, permittivity ( r 5 2:029Þ and dielectric losses (tand 5 0.084) have been extracted using a ring resonator for the paper substrate of 250 lm thickness. These parameters have been used in HFSS simulation for designing two antennas, a broad side patch antenna and an end fire radiation quasi-yagi antenna, with resulting efficiency 55% and 45%, respectively. The antennas are quite narrow band around a central frequency of 2.4 GHz and correspond to the most common needs for WSN on trains. 2. M. Grud en, A. Westman, J. Platbardis, P. Hallbj€ orner, and A.Rydberg, Reliability experiments for wireless sensor networks in train environment,

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Doherty power amplifier with enhanced in‐band load modulation for 100 MHz LTE‐advanced application

Xia

Zhu

2014

Micro & Optical Tech Letters

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This article presents a modified GaN Doherty power amplifier (PA) for 100 MHz long‐term evolution (LTE)‐advanced application at 2.5 GHz. To improve load modulation and consistency of the output power and efficiency in the operation bandwidth, a method was proposed by choosing optimal load impedances in Class C mode, properly increased gate bias voltage and optimized input matching network for the design of the peaking amplifier. When driven with 100 MHz LTE‐advanced signals, the designed PA achieves adjacent channel leakage ratio of −49 dBc after digital predistortion at 9 dB back‐off output power of about 40.5 dBm with efficiency of 42%. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:391–395, 2015

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High Efficiency Two‐Stage Unbalanced Doherty Power Amplifier for Lte Applications

Cited by 3 publications

References 7 publications

2.6 GHz GaN-HEMT Power Amplifier MMIC for LTE Small-Cell Applications

2.6 GHz GaN-HEMT Power Amplifier MMIC for LTE Small-Cell Applications

Design of a DPA based on the dual‐level supply voltage modulation for efficiency improvement

Doherty power amplifier with enhanced in‐band load modulation for 100 MHz LTE‐advanced application

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