Linearization of power amplifiers by second harmonics and fourth‐order nonlinear signals

Atanasković, Aleksandar; Males-Ilic, Natasa; Milovanović, Bratislav

doi:10.1002/mop.27294

Cited by 12 publications

(13 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The great majority of the results presented in are essentially reformulated results from previously published papers and . Besides, papers and are not cited in , and paper is not cited in the newer paper .…”

mentioning

confidence: 54%

Comment on “linearization of power amplifiers by second harmonics and fourth‐order nonlinear signals” by A. Atanaskovic, N. Males‐Ilic, and B. Milovanovic

Dimitrijević

2015

Micro & Optical Tech Letters

View full text Add to dashboard Cite

The similarities (a) and (b), showing the photos of the implemented modules, indicate that all three papers consider the same hardware implementation.The similarities (c) indicate that all papers use the same method with the identical configuration.The similarities (d), (e), and (f) show the same experimental results.Finally, we can say that the vast majority of the paper [1] is the re-use of the previously published results without citing the

show abstract

mentioning

confidence: 54%

Comment on “linearization of power amplifiers by second harmonics and fourth‐order nonlinear signals” by A. Atanaskovic, N. Males‐Ilic, and B. Milovanovic

Dimitrijević

2015

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…According to the theoretical analysis of the linearization approach given in [8]- [10], the linearization signals, IM2 and IM4, which are adjusted on the appropriate amplitudes and phases and injected at the input and output of the amplifier transistor, can reduce both the third-and fifth-order distortion of fundamental signal. However, the suppression grade depends on the relations between the amplitudes as well as phases of the IM2 and IM4 signals generated at the peaking amplifier output.…”

Section: Linearization Resultsmentioning

confidence: 99%

“…It comprises M/A-COM PIN diode variable attenuator MA4VAT2007-1061T, two Mini-Circuits 180° voltage variable phase shifters JSPHS-23+ to provide phase shift of 360° and Skyworks high linear 2W power amplifier SKY65120. This linearization circuit, which was already used in experiments performed for the linearization of narrowband amplifiers, [10], [11] satisfies the requirements for broadband applications.…”

Section: Design and Characteristics Of Broadband Doherty Amplifiermentioning

confidence: 99%

“…We applied the approach where the IM2 and IM4 signals are injected together with the fundamental signals into the carrier amplifier input and fed at its output [9]. Additionally, the influence of IM2 and IM4 signals on Doherty amplifier linearity was verified experimentally on a standard symmetrical and asymmetrical two-way Doherty amplifier [9], [10] and [11].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Linearization of broadband two-way microstrip Doherty amplifier

2016

View full text Add to dashboard Cite

The linearization of a broadband two-way microstrip Doherty amplifier designed for application in the frequency range 0.9-1.0 GHz is considered in this paper. The amplifier characterized by the maximum output power 8 W is designed in microstrip technique for broadband applications. For linearization purposes, the second-and fourth-order nonlinear signals are extracted at the output of the peaking cell, adjusted in amplitude and phase and fed at the input and output of the carrier transistor over the microstrip hairpin band-pass filters. The effects of the linearization are considered through the simulation for two sinusoidal signals with different frequency interval between them setting on from 5 MHz and going up to30 MHz at different input power levels up to saturation, as well as for an Orthogonal frequency division multiplexing (OFDM) digitally modulated signal.

show abstract

“…In the previously deployed linearization technique that uses the fundamental signals' second-order (IM2) and fourth-order nonlinear signals (IM4) at frequencies around the second harmonics, [6][7][8][9][10][11][12], the signals for linearization were generated and prepared for injection at the input and output of the transistor amplifier in the RF analogue signal domain. Linearization effects were validated on the single stage RF power amplifiers throughout the simulation process [6]- [8] and experiments [9], as well as on the Doherty amplifiers [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

RF pa linearization by signals modified in baseband digital domain

2017

View full text Add to dashboard Cite

This paper represents the linearization of the RF power amplifier performed by a new approach that combines two different methods exploiting the modified baseband signals. The signals for linearization in both methods are formed and processed in digital domain. The required modified baseband signals for linearization are products of the second order nonlinearity of a nonlinear system fed by the useful baseband signal. In the first method, adequate part of the modified baseband signal is adjusted in amplitude and polarity and injected at the input and output of the amplifier transistor across the series LC resonant circuit. In the second method, the appropriate modified baseband signal set on the appropriate amplitude and phase modulates the fundamental carrier second harmonic, which is then inserted at the input and output of the amplifier transistor. The effects of the combined linearization method are considered on a single stage power amplifier for quadrature amplitude modulated signals characterized with frequency spacing between spectral components up to 60 MHz for different input power levels, as well as for WCDMA digitally modulated signal.

show abstract

Linearization of power amplifiers by second harmonics and fourth‐order nonlinear signals

Cited by 12 publications

References 12 publications

Comment on “linearization of power amplifiers by second harmonics and fourth‐order nonlinear signals” by A. Atanaskovic, N. Males‐Ilic, and B. Milovanovic

Comment on “linearization of power amplifiers by second harmonics and fourth‐order nonlinear signals” by A. Atanaskovic, N. Males‐Ilic, and B. Milovanovic

Linearization of broadband two-way microstrip Doherty amplifier

RF pa linearization by signals modified in baseband digital domain

Contact Info

Product

Resources

About