Broadband HBT Doherty Power Amplifiers for Handset Applications

Kang, Daehyun; Kim, Dongsu; Moon, Jin Young; Kim, Bumman

doi:10.1109/tmtt.2010.2086070

Cited by 41 publications

(18 citation statements)

References 15 publications

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“…This is due to the harmonic-filtering characteristics of the reconfigurable output-matching network. Table IV shows the comparison of the performance of this work compared with previously reported works of multi-band power amplifiers [15], [16].…”

Section: B Implementation Of the Multi-band Power Amplifiermentioning

confidence: 98%

A Multiband Power Amplifier With a Reconfigurable Output-Matching Network for 10-MHz BW LTE Mobile Phone Applications

Lee

Jung

Song

2015

IEEE Trans. Circuits Syst. II

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Abstract-A single-chip power amplifier (PA) with a reconfigurable output-matching network is presented for 4G multi-band mobile phone application. The multi-band PA (MBPA) consists of an amplifier and a reconfigurable output-matching network (a band selection circuit and a tunable transmission line). Multi-band, load-impedance modulation is done by controlling a PIN switch of the band selection circuit and varactor diodes of the tunable transmission line in the reconfigurable output-matching network. This MBPA delivered a gain of more than 11 dB, an adjacent-channel-leakage ratio of the evolved universal mobile telecommunications system (UMTS) terrestrial radio access (E-UTRA) smaller than −32 dBc, and a power-added efficiency (PAE) larger than 29% at the output power of 26 dBm for high and low frequency bands with a 10 MHz 16quadrature amplitude modulation long-term-evolution signal.Index Terms -long-term-evolution, multi-band, power amplifier, PAE, reconfigurable output-matching network.1549-7747 (c)

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Section: B Implementation Of the Multi-band Power Amplifiermentioning

confidence: 98%

A Multiband Power Amplifier With a Reconfigurable Output-Matching Network for 10-MHz BW LTE Mobile Phone Applications

Lee

Jung

Song

2015

IEEE Trans. Circuits Syst. II

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“…If we denote the phase of the -parameter by , then we can write the -parameter matrix as (16), shown at the bottom of the following page.…”

Section: A Omcnmentioning

confidence: 99%

Analytical Design Methodology for Generic Doherty Amplifier Architectures Using Three-Port Input/Output Networks

Akbarpour

Helaoui

Ghannouchi

2015

IEEE Trans. Microwave Theory Techn.

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In this paper, a new Doherty amplifier architecture along with an analytical based design methodology is proposed. The proposed architecture uses novel three-port network as the output matching/combining network (OMCN). The three-port OMCN performs the power combining for any arbitrary output power ratios from the two transistors of the Doherty amplifier. It also performs the impedance matching from any arbitrary complex load impedance to the optimum impedances for both transistors at peak output power. Commonly in Doherty amplifiers, an optimum performance at peak power and a sub-optimum performance at power back-off are often obtained. Using the proposed output network, optimum performance can be reached at power back-off, as well as at peak power. Another three-port network is proposed for input matching/dividing network (IMDN) at the input of the proposed Doherty amplifier. The three-port IMDN is designed to perform the power division with any arbitrary division ratio, adjust the arbitrary phase difference between the input signals to the two transistors, and provide the impedance matching from any arbitrary complex source impedance to the optimal source impedances for the two transistors. To verify the provided theory, two prototype amplifiers are designed and tested. A 12-W amplifier is designed for a 50source and load impedances at 1 GHz. Another 12-W amplifier is designed at 1 GHz for complex source and load impedances. Both amplifiers have efficiency of higher than 50% at 7-dB output power range.Index Terms-Back-off, Doherty amplifier, efficiency, peak-toaverage power ratio (PAPR), three-port network.

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“…Among others, the frequency-sensitive output combining network, input and output offset lines, as well as the frequency-dependent input impedance of the peaking device are dominant factors which limit the bandwidth capability of this amplifier architecture. Nevertheless, solutions have been recently proposed to extend the bandwidth of the Doherty amplifier [5][6][7][8][9][10][11][12][13][14]. Low-Q output combining network was implemented in [5] to extend the bandwidth up to 42%.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of 80-W wideband asymmetrical Doherty amplifier

Bathich

Boeck

2014

Int. j. microw. wirel. technol.

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Design and analysis of 80-W wideband asymmetrical Doherty amplifier khaled bathich and georg boeckThis paper presents the analysis and design of a wideband asymmetrical Doherty amplifier. The frequency response of the output combining network of the Doherty amplifier with arbitrary back-off level configuration is analyzed. Other bandwidthlimiting factors were discussed and analyzed as well. A number of performance enhancement techniques were taken into consideration to obtain high and flat back-off efficiency over the amplifier design band of 1.7-2.25 GHz. The designed Doherty amplifier had, at 8.0-9.9 dB output back-off, a minimum efficiency of h ¼ 50% [power-added efficiency of 45%], measured near 40 dBm of output power, and over 28% bandwidth. Using digital predistortion (DPD) linearization, an adjacentchannel leakage ratio (ACLR) of 243 dBc was obtained for a single-carrier W-CDMA signal, at 40.9 dBm and 46% of average output power and drain efficiency, respectively. The designed amplifier represents the first wideband Doherty amplifier reported over extended power back-off range.

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Broadband HBT Doherty Power Amplifiers for Handset Applications

Cited by 41 publications

References 15 publications

A Multiband Power Amplifier With a Reconfigurable Output-Matching Network for 10-MHz BW LTE Mobile Phone Applications

A Multiband Power Amplifier With a Reconfigurable Output-Matching Network for 10-MHz BW LTE Mobile Phone Applications

Analytical Design Methodology for Generic Doherty Amplifier Architectures Using Three-Port Input/Output Networks

Design and analysis of 80-W wideband asymmetrical Doherty amplifier

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