Wide/Multiband Linearization of TWTAs Using Predistortion

Katz, A.; Gray, Robert; Dorval, Roger

doi:10.1109/ted.2009.2015412

Cited by 35 publications

(7 citation statements)

References 8 publications

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“…Variation of ss gain must be equalized for best performance. For example a 2 dB gain ripple can degrade a 30 dB carrierto-intermodulation ratio (C/I) by 3 dB [4]. Consequently, components between the PDL and the HPA that may affect flatness and increase ripple should be avoided.…”

Section: Advantages Of a Combined Buc And Linearizermentioning

confidence: 99%

Integrated linearizer/block upconverters

Katz

Gray

Dorval

2014

2014 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR)

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The trend in the design of linearizers has been to integrate more and more functions with the basic distortion correction element. This paper discusses the latest development in this trend: the combining of the linearizer with the block up converter (BUC) into a single functional LBUC module. This paper will discuss the advantages of combining a BUC with a linearizer and describe an LBUC developed for a Ka-band SATCOM application.

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Section: Advantages Of a Combined Buc And Linearizermentioning

confidence: 99%

Integrated linearizer/block upconverters

Katz

Gray

Dorval

2014

2014 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications (PAWR)

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“…So to change the magnitude and phase of the IMD is to change the impedance network as well as the bias voltage. When designing a PD, first get the model parameters of the PD from the nonlinear characteristics of the TWTA according to equation (1) to (4). Second calculate the characteristic impedance and electrical angel of the microstrip stub serving part of the impedance network together with the load resistance.…”

Section: B Principle Of Predistortionmentioning

confidence: 99%

A reflective TWTA predistortion linearizer for Ka-band application

Wang¹,

Zhou²,

Hu³

et al. 2013

Proceedings of the 2nd International Conference on Computer Science and Electronics Engineering (ICCSEE 2013)

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A predistortion linearizer used for Ka-band travelling wave tube amplifiers (TWTAs) was proposed. Based on analysis of nonlinear transfer characteristics of TWTA using a power series, the inverse nonlinear distortion characteristics of predistorter which was also the model of predistortion linearizer was proposed. A reflective structure was used to realize the linearizer, it's composed of anti-parallel schottky diodes, quadrature hybrid, matching networks seen from the diodes. The Carrier-to-Intermodulation(C/I) of Kaband TWTA was improved a maximum of 19dB by proposed predistortion linearizer.

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“…There has been lots of analog predistortion structure proposed using Schottky diodes [4], and [5] or FETs [6] as the nonlinear device to produce the Inverse nonlinear distortion. It is relatively difficult to design a broad band Linearizer with parasite element in the Linearizer.…”

Section: Introductionmentioning

confidence: 99%

New Broadband Predistortion Linearizer Using Balanced Circuits Structure for Satellite TWTAs

2016

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Abstract. The power amplifies is a key component influencing the power efficiency of communication system. The travelling wave tube is widely used in satellite system because of its high efficiency, apposite weight and broadband characteristic, but its strong nonlinear characteristic generates intermodulation distortion, which degrades the data quality of transmitted signal and causes interference in adjacent channels. The analogue predistortion structure using Schottky diodes could improve the linearity well, but parasite element in the Linearizer limits predistortion broadband, reluctant to satisfy the growing high volume data transmission requirement. This paper presents a new balanced structure of Linearizer for the travelling wave tube amplifier. We have analyzed the model of linearizer and the TWTA and used to calculate the intermodulation distortion and optimize the Linearizer nonlinear expansion characteristic. A frequency bandwidth of 1.2 GHz Linearizer has been demonstrated with a K-band TWTA between 19.8 and 21.0 GHz. The measurement result shows that the linearizer delivers about 2~6dB of gain expansion and 20~60 degrees phase shift expansion, and the cascaded LTWTA shows good linearity improvement of 17.8dB at 6dB input power back off point.

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Wide/Multiband Linearization of TWTAs Using Predistortion

Cited by 35 publications

References 8 publications

Integrated linearizer/block upconverters

Integrated linearizer/block upconverters

A reflective TWTA predistortion linearizer for Ka-band application

New Broadband Predistortion Linearizer Using Balanced Circuits Structure for Satellite TWTAs

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