Class-E Power Amplifier in a Polar EDGE Transmitter

López, N.; Jiang, Xufeng; Maksimović, Dragan; Popović, Zoya

doi:10.1109/mwsym.2006.249771

Cited by 13 publications

(4 citation statements)

References 14 publications

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“…Unlike many polar modulators, which drive the switching amplifier RF input with an amplitude-limited carrier [4], the solution reported here employs a partially envelope-modulated RF carrier at the amplifier's input. The class E amplifier is driven by Fig.…”

Section: High-efficiency Polar Modulated Pa Architecturementioning

confidence: 99%

A 60% PAE WCDMA Handset Transmitter Amplifier

Warr

Morris

Watkins

et al. 2009

IEEE Trans. Microwave Theory Techn.

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Abstract-This paper reports the design of a class-E envelope elimination and restoration (EER) based amplifier for a wideband code division multiple access handset application that attains 60% power-added efficiency at peak power output. Emphasis is placed on the envelope modulator that employs a novel split-frequency approach in order to attain an efficiency of 80% for this part of the system. In contrast to standard EER systems, the carrier is not amplitude limited, but rather predistorted to maintain both linearity and power efficiency. Performance in terms of efficiency, spectral output, and error vector magnitude is reported.

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Section: High-efficiency Polar Modulated Pa Architecturementioning

confidence: 99%

A 60% PAE WCDMA Handset Transmitter Amplifier

Warr

Morris

Watkins

et al. 2009

IEEE Trans. Microwave Theory Techn.

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“…At higher frequencies, an alternative methodology based on distributed elements [14] has been proposed and widely used in later works for frequencies up to and around 10 GHz [4][5][6][7][8]. Like in the class AB methodology, most of these recent class E design procedures make use of an optimization process to correct initial assumptions and idealization; which may lead to other class of operation.…”

Section: B Class-e Amplifier and Switch Modelmentioning

confidence: 99%

“…Design procedures [4][5][6][7][8] using distribute elements technique have the following common steps:…”

Section: B Class-e Amplifier and Switch Modelmentioning

confidence: 99%

“…Nevertheless, there has been a trend to keep using these procedures also at high frequencies. The general approach in this case is to use low frequency solutions as initial design values, and then by the application of optimization procedures with nonlinear simulations, correct or tune these values to obtain high output power and/or efficiency [4][5][6][7][8]. Alternatively load pull measurements/simulations may be used, as well.…”

Section: Introductionmentioning

confidence: 99%

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WiMAX class AB and class E power amplifier design using equivalent capacitance concept

Medina

Schreurs

Nauwelaers

2008

Int J RF and Microwave Comp Aid Eng

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In this article, a linear class AB and nonlinear class E power amplifier for WiMAX application are designed using the concept of equivalent capacitance. This concept provides a straightforward way to design power amplifiers at microwave frequencies without recurring to cumbersome formulas or optimization processes intended to get the output power and efficiencies figures associated to these amplifier classes. Furthermore, the use of optimization algorithms may lead to another class of operation if the intrinsic waveforms are not screened.

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Envelope Tracking Techniques Applied to a Fully Monolithic Silicon‐BasedRFPower Amplifier System

Lie

Lopez

2014

Wiley Encyclopedia of Electrical and Electronics Engineering

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This article presents a detailed design example of applying envelope tracking (ET) techniques on a highly monolithic silicon‐based radio‐frequency (RF) power amplifier (PA) to form a high‐efficiency and low‐cost ET‐PA system. An envelope‐tracked SiGe cascode PA with an integrated complementary metal–oxide–semiconductor (CMOS) envelope modulator for mobile WiMAX and 3GPP long‐term evolution (LTE) transmitters (TXs) is shown in this work. The entire ET‐based RF PA system delivers the linear output power of 22.3/24.3 dBm with the overall power‐added efficiency (PAE) of 33%/42% at 2.4 GHz for the WiMAX 64QAM and the 3GPP LTE 16QAM modulations, respectively. Additionally, it exhibits a highly efficient broadband characteristic for multiband applications. Compared with the conventional fixed‐supply cascode PA, our ET‐based cascode PA meets the WiMAX/LTE spectral mask and error vector magnitude (EVM) spec at close to its P 1dB compression without the need for predistortion. The SiGe PA and the CMOS envelope modulator are both designed and fabricated in the TSMC 0.35‐μm SiGe bipolar CMOS (BiCMOS) process on the same die. This work represents an essential integration step toward achieving a fully monolithic ET‐based TX for wideband wireless applications.

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Class-E Power Amplifier in a Polar EDGE Transmitter

Cited by 13 publications

References 14 publications

A 60% PAE WCDMA Handset Transmitter Amplifier

A 60% PAE WCDMA Handset Transmitter Amplifier

WiMAX class AB and class E power amplifier design using equivalent capacitance concept

Envelope Tracking Techniques Applied to a Fully Monolithic Silicon‐BasedRFPower Amplifier System

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