Design of Power Efficient Power Amplifier for 4G User Terminals
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Design of Power Efficient Power Amplifier for 4G User Terminals. Presented By Abubakar Sadiq Hussaini, IEEE, IET, OSA, NSE Raed A. A. Alhameed & Jonathan Rodriguez. I suppose we need to ask where the power goes in mobile phones :

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Design of Power Efficient Power Amplifier for 4G User Terminals

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Design of power efficient power amplifier for 4g user terminals

Design of Power Efficient Power Amplifier for 4G User Terminals

Presented

By

Abubakar Sadiq Hussaini, IEEE, IET, OSA, NSE

Raed A. A. Alhameed & Jonathan Rodriguez


Design of power efficient power amplifier for 4g user terminals

  • I suppose we need to ask where the power goes in mobile phones:

  • Some is unavoidably used in communicating with the human being, so power has to be put into:

    • The audio signal and the visual information on the screen.

  • I don't think that the audio power could be reduced any more, unless the output amplifiers could be made more efficient, but I would imagine that they are all ready pretty good.

  • The power put into the screen might be reduced by using the headset display, and that could be a very significant argument for change in the way phones are used.

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Design of power efficient power amplifier for 4g user terminals

  • After that, we have power absorbed in the digital circuits, but the digital community is well on top of the issue of reducing that.

  • We have antenna and link budget issues: What determines the noise floor in the link? Is it the environment, or is it in the circuits? Using high gain antennas would reduce the transmitter power requirements

  • Then we have the power taken by the RF section: I would expect that the transmitter is far more of a problem than the receiver.

  • What kind of transmitter architecture do we use? Is it a basic linear system, and hence rather lossy

  • If you wanted to reduce the waste power in the transmitter, then you can learn lessons from the high-power broadcasting community who have used things like Doherty modulation and delta modulation

3


Outline

Outline

  • Motivation

  • Introduction

  • Power consumptions

  • Innovation

  • State of the art

4


Outline1

Outline

  • Design

  • Operation

  • Results

  • Conclusion

5


Motivation

Motivation

6


Motivation1

Motivation

  • ICT power consumption

  • This is 3% of global power consumption

  • 2% of global CO2 emissions

  • Power consumption of ICT is increasing by 16-20% per year

7


Introduction

Introduction

  • Highly integrated

  • Reconfigurable

  • Power Efficient

  • Low-Cost

8


Introduction1

Introduction

  • Multi-standard radios (GSM, UMTS,WCDMA, DVB-T, Mobile WiMAX)

Thisradioscantheavailablespectrumandchangeitsnetwork

parameters(frequency, bandwith, modulation) for maximum

data transfer

9


Power consumptions

Power consumptions

  • Power amplifier consumes the highest power and convert more than 50% of the power into heat

10


Innovation

Innovation

  • An efficient architecture and maintaining the QoS

  • Radio implementation:

    Power amplifier

    Antennas and antenna interface

    DSP

  • Radio functionality:

    Energy efficient modulation and coding

    Network coding and cooperative networks

11


State of the art

State of the art

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  • Techniques such as Chireix outphasing, Doherty configuration, Kahn

    envelope elimination and Restorations(EER), And Envelope tracking (ET)

  • These will allow PAs to achieved good efficiency over a wide range of

    output power, yielding better overall efficiency


Design

Design

Propose block diagram of Doherty RF power amplifier

13


Operation

Operation

PA 1

Z

Z

PA 2

Z

Block diagram of Doherty power amplifier

14


Operation1

Operation

PA 1

Z

X

Z

PA 2

Z

Block diagram of Doherty power amplifier

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Prototype 1

Prototype 1

Implemented prototype of proposed Doherty RF power amplifier

16


Prototype 2

Prototype 2

Power splitter

17


Result 1

Result 1

Insertion loss

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Result 2

Result 2

Phase difference

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Result 3

Result 3

Gain Characteristics

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Result 4

Result 4

AM-AM Characteristics

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Result 5

Result 5

AM-PM Characteristics

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Result 6

Result 6

Power-Added Efficiency

23


Result comparison

Result - Comparison

Comparison performance of Class B and Load modulation at Pout 1dB compression point

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Conclusion

Conclusion

The performance comparisons between Doherty RF power amplifier and conventional class B RF power amplifier are performed.

The achieved results of the proposed design process have shown an excellent efficiency and power performances.

Applying Doherty technique can significantly reduce the CO2 emission and power consumption in the transceiver.

The self-managing characteristic of the Doherty RF power amplifier has made its implementation more attractive.

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Design of power efficient power amplifier for 4g user terminals

I Thank you!

Please, any Question?

E-mail: [email protected]

Web: http://www.av.it.pt/4TELL/

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