Linearity Improvement of HBT-based Doherty Power Amplifiers Based on a Simple Analytical Model

Zeng, Yu; Metzger, A.; Zampardi, P.J.; Iwamoto, M.; Asbeck, P.M.

doi:10.1109/mwsym.2006.249832

Cited by 13 publications

(11 citation statements)

References 5 publications

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“…The classical Doherty power combiner employs a quarter-wave transmission line. It has been shown that by tailoring the transmissionline impedance (the ratio of Z c to Z 0 ), the range of power for high efficiency can be maximized [4]. To maintain adequate linearity of the Doherty amplifier, the turn-on of the auxiliary amplifier must be carefully controlled as a function of input power.…”

Section: Doherty Amplifier Techniquesmentioning

confidence: 99%

Linearity and Efficiency Strategies for Next‐Generation Wireless Communications

Hueber

Staszewski

2010

Multi‐Mode/Multi‐Band RF Transceivers for Wireless Communications

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Section: Doherty Amplifier Techniquesmentioning

confidence: 99%

Linearity and Efficiency Strategies for Next‐Generation Wireless Communications

Hueber

Staszewski

2010

Multi‐Mode/Multi‐Band RF Transceivers for Wireless Communications

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“…Multiple stages of the Doherty can be employed to realize even greater power saving benefits as the RF output power is reduced [33,34]. Although the Doherty amplifier topology was invented decades ago, it has enjoyed renewed interest recently for base station applications [35][36][37] and handset applications [38][39][40]. The load impedance presented to the transistor can be varied directly to adaptively modify the impedance presented to the transistor in response to the required output voltage.…”

Section: Power Efficiency Enhancement Strategiesmentioning

confidence: 99%

Linearity and efficiency enhancement strategies for 4G wireless power amplifier designs

Larson

Kimball

Asbeck

2008

2008 IEEE Custom Integrated Circuits Conference

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Next generation wireless transmitters will rely on highly integrated silicon-based solutions to realize the cost and performance goals of the 4G market. This will require increased use of digital compensation techniques and innovative circuit approaches to maximize power and efficiency and minimize linearity degradation. This paper summarizes the circuit and system strategies being developed to meet these aggressive performance goals.

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“…Meanwhile, analytical formulations like distortion analysis [1,2], non-linearity analysis [3][4][5], distributed amplifier design [1,6] and other applications [7,8] are derived based on simplified unilateral model assumption for the active device. In the area of model parameter extractions, many techniques, [9][10][11], have been presented to accurately extract active device small signal model parameters using bilateral model.…”

Section: Introductionmentioning

confidence: 99%

250 MHz TO 30 GHz, UNILATERAL CIRCUITMODEL FOR INGAP/GAAS HBT

Thein¹,

Law²,

Fu³

2012

PIER C

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Abstract-A unilateral circuit model, which precisely predicts small signal response over a wide range of frequencies and bias points, is quantitatively analyzed and presented. The shortfall of current unilateral assumption and transformation technique is presented. A complete and explicit analysis is provided to develop a compact unilateral circuit model. The model is intended to predict input reflection, forward transmission and output reflection coefficients over wide range of frequencies. The technique is validated by transforming bilateral a small signal model of 3 × 3 µm × 40 µm, InGaP/GaAs HBT into its unilateral equivalent over the frequency range of 250 MHz to 30 GHz. The accuracy of the technique is corroborated at various bias conditions; collector current from 3 mA to 150 mA and collectoremitter voltage from 1 V to 5 V. Simulated results show very good agreement between small signal responses of transformed unilateral and bilateral circuit models.

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Linearity Improvement of HBT-based Doherty Power Amplifiers Based on a Simple Analytical Model

Cited by 13 publications

References 5 publications

Linearity and Efficiency Strategies for Next‐Generation Wireless Communications

Linearity and Efficiency Strategies for Next‐Generation Wireless Communications

Linearity and efficiency enhancement strategies for 4G wireless power amplifier designs

250 MHz TO 30 GHz, UNILATERAL CIRCUITMODEL FOR INGAP/GAAS HBT

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