Power Amplifier

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Bumman Kim - One of the best experts on this subject based on the ideXlab platform.

  • Power Amplifier fundamentals
    RF and mm-Wave Power Generation in Silicon, 2016
    Co-Authors: Bumman Kim
    Abstract:

    Abstract This chapter introduces the basic concepts and methodologies in Power Amplifier designs. It starts with the small-signal conjugate matching widely used in conventional small-signal Amplifiers and then presents the large-signal Power (load-line) matching that is often required in Power Amplifier designs to maximize the Power generation capability of a given transistor. It also covers the concepts of Power gain, Power efficiency, load-line plot, and load-pull plot. Then, classic linear Power Amplifier topologies, i.e., the class-A, -B, -AB, and -C Power Amplifiers, are introduced, which are classified based on their conduction angles. In particular, the nonlinear behaviors in linear Power Amplifier designs are discussed in detail. Next, classic switching Power Amplifier topologies are presented, including the class-F, F -1 , D, and D -1 , and AB/F topologies, whose theoretical drain efficiencies can achieve 100%. This chapter concludes with the class-E switching Power Amplifier topology, design equations, and its operation.

  • Wideband envelope tracking Power Amplifier for LTE application
    2012 IEEE Radio Frequency Integrated Circuits Symposium, 2012
    Co-Authors: Dongsu Kim, Daehyun Kang, Jooseung Kim, Yunsung Cho, Bumman Kim
    Abstract:

    This paper describes an envelope tracking Power Amplifier for LTE application with large channel bandwidth up to 30 MHz. For the wideband operation, a supply modulator with accurate and fast envelope tracking is essential. The bandwidth of the supply modulator is increased about 2 times without stability degradation by inserting a zero in a feedback path of a linear Amplifier. The supply modulator is fabricated using CMOS process and a Power Amplifier is fabricated using HBT process. An implemented envelope tracking Power Amplifier delivers efficiencies of 40.0/39.4/38.5 % for 10/20/30 MHz LTE signals at output Power of 27 dBm.

  • Envelope tracking Power Amplifier robust to battery depletion
    2010 IEEE MTT-S International Microwave Symposium, 2010
    Co-Authors: Jinsung Choi, Dongsu Kim, Daehyun Kang, Jungmin Park, Boshi Jin, Bumman Kim
    Abstract:

    A wideband envelope tracking Power Amplifier, which is robust to battery depletion, is introduced. An integrated boost converter keeps a stable operation of the PA supply modulator. Even at the battery depletion from 4.2V to 2.8V, there is no significant degradation of output Power and linearity in the Power Amplifier. Moreover, the efficiency degradation by the additional regulator is minimized for the novel supply modulator architecture proposed in this work. The fabricated 2.535GHz envelope tracking Power Amplifier presents max/min Power-added efficiencies of 32.3/26.2% for 10MHz BW 3GPP LTE standard along the battery voltage from 4.2V to 2.8V.

Yang Tin - One of the best experts on this subject based on the ideXlab platform.

  • Study on Linearization of Power Amplifier
    Computer Simulation, 2014
    Co-Authors: Yang Tin
    Abstract:

    In a communication system,high Power Amplifier will be needed to amplify signals to achieve the emission requirements of signal with high Power. The inherent non- linear characteristic of the Power Amplifier belongs to the active electronic devices,so studying its mechanism and taking measures to improve are of great significance. By studying the memory effect and nonlinear characteristics of the Power Amplifier,a predistortion optimization algorithm based on the polynomial was proposed. This algorithm builds an Amplifier model on the basis of the memory polynomial structure,uses the indirect learning to design a predistorter before the Amplifier module,and then uses the least square algorithm to optimize the predistortion derive parameters. The simulation result shows that,after the pre- distortion processing,a better adjacent channel Power ratio of the output signal was obtained,so it is close to the ideal linearization amplification principle of the Power Amplifier. The total effect of the two modules makes the overall input- output linearization and makes full use of the output Power.

Zicheng Xiong - One of the best experts on this subject based on the ideXlab platform.

  • A 2.14GHz Driver-stage Power Amplifier for Doherty Power Amplifier
    DEStech Transactions on Computer Science and Engineering, 2017
    Co-Authors: Xin Zhang, Bin Wang, Zicheng Xiong
    Abstract:

    This paper presented a high Power Amplifier drive a Doherty Power Amplifier. By using computer software to design and test instrument to adjust, the result shows the driver-stage Power Amplifier that is made of the MRF8S21100H from NXP company meet the 15dB gain, and 42% Power added-efficiency (PAE) at the maximum output Power. Comparing with the traditional design method, this method has the advanced success rate and design cycle.

  • Study of a Driver-Stage Power Amplifier for Doherty Power Amplifier
    2016 3rd International Conference on Information Science and Control Engineering (ICISCE), 2016
    Co-Authors: Zicheng Xiong, Bin Wang, Shiwei Zhao
    Abstract:

    In this paper, a driver-stage Power Amplifier is presented for a Doherty Amplifier that worked at 2.6GHz. The simulation and measurement results meet all scheduled design indexes, which the peak output Power is about 39dBm, the biggest Power gain is about 15dB and the largest PAE is about 31%. It gives a method by combining the software and hardware to design and debug the Power Amplifier. Compared with the traditional method, this method can improve the design success and shorten the design cycle.

An Shi-quan - One of the best experts on this subject based on the ideXlab platform.

  • High efficiency class-E wide band-gap Power Amplifier with input harmonic suppression
    Journal of Hefei University of Technology, 2012
    Co-Authors: An Shi-quan
    Abstract:

    An improved design method of class-E wide band-gap Power Amplifier with input harmonic suppression is proposed,by which the input harmonic Power can be used and the Power-added efficiency(PAE) can be improved.The work principle of the class-E Power Amplifier is analyzed,and using the wide band-gap device,the improved class-E Power Amplifier is designed by the software ADS.Measurement results of the actual Amplifier circuit show that because of the improvement of input harmonic suppression,the output Power of the Power Amplifier in 1.1~1.3 GHz keeps above 10 W and the PAE reaches to 79.6%.The capacity of the improved class-E Power Amplifier is obviously superior to the conventional one.

  • High efficiency class-E wide band-gap Power Amplifier with input harmonic suppression
    Journal of Hefei University of Technology, 2012
    Co-Authors: An Shi-quan
    Abstract:

    An improved design method of class-E wide band-gap Power Amplifier with input harmonic suppression is proposed,by which the input harmonic Power can be used and the Power-added efficiency(PAE) can be improved.The work principle of the class-E Power Amplifier is analyzed,and using the wide band-gap device,the improved class-E Power Amplifier is designed by the software ADS.Measurement results of the actual Amplifier circuit show that because of the improvement of input harmonic suppression,the output Power of the Power Amplifier in 1.1~1.3 GHz keeps above 10 W and the PAE reaches to 79.6%.The capacity of the improved class-E Power Amplifier is obviously superior to the conventional one.

Dongsu Kim - One of the best experts on this subject based on the ideXlab platform.

  • Wideband envelope tracking Power Amplifier for LTE application
    2012 IEEE Radio Frequency Integrated Circuits Symposium, 2012
    Co-Authors: Dongsu Kim, Daehyun Kang, Jooseung Kim, Yunsung Cho, Bumman Kim
    Abstract:

    This paper describes an envelope tracking Power Amplifier for LTE application with large channel bandwidth up to 30 MHz. For the wideband operation, a supply modulator with accurate and fast envelope tracking is essential. The bandwidth of the supply modulator is increased about 2 times without stability degradation by inserting a zero in a feedback path of a linear Amplifier. The supply modulator is fabricated using CMOS process and a Power Amplifier is fabricated using HBT process. An implemented envelope tracking Power Amplifier delivers efficiencies of 40.0/39.4/38.5 % for 10/20/30 MHz LTE signals at output Power of 27 dBm.

  • Envelope tracking Power Amplifier robust to battery depletion
    2010 IEEE MTT-S International Microwave Symposium, 2010
    Co-Authors: Jinsung Choi, Dongsu Kim, Daehyun Kang, Jungmin Park, Boshi Jin, Bumman Kim
    Abstract:

    A wideband envelope tracking Power Amplifier, which is robust to battery depletion, is introduced. An integrated boost converter keeps a stable operation of the PA supply modulator. Even at the battery depletion from 4.2V to 2.8V, there is no significant degradation of output Power and linearity in the Power Amplifier. Moreover, the efficiency degradation by the additional regulator is minimized for the novel supply modulator architecture proposed in this work. The fabricated 2.535GHz envelope tracking Power Amplifier presents max/min Power-added efficiencies of 32.3/26.2% for 10MHz BW 3GPP LTE standard along the battery voltage from 4.2V to 2.8V.