Development of a compact, broadband FET linearizer for satellite use

Ogura, Satoshi; Seino, K.; Kamikokura, Akihiro; Hirose, Haruzo

doi:10.1109/mwsym.1997.596541

Cited by 13 publications

(2 citation statements)

References 5 publications

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“…Linear power amplifiers are required to have high efficiency and low distortion simultaneously. In order to achieve both characteristics, several types of linearised amplifiers have been report ed: pre-distortion linearised amplifiers [1][2][3], feedforward linearised amplifiers [4][5][6], and adaptive digital linearis ed amplifiers [7][8]. The feedforward linearised method was reported to offer the greatest improvement in terms of distortion, and can be expected lead to realization of a small, low-cost device.…”

Section: Introductionmentioning

confidence: 99%

2.5 GHz Wide Band Linear Amplifier with Feedforward Lineariser on a Board

Kayano¹,

Iwata

Sato

et al. 2002

32nd European Microwave Conference, 2002

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A wide band feedforward lineariser amplifier we have developed is described. In particular, we report the IM3 improvement obtained without automatic adaptive control circuits, indicating the possibility of realizing small, low-cost products. We designed a lineariser amplifier for 2.5 GHz band to demonstrate the effectiveness of our approach and measurement revealed the wide band linearising capability of over 100 MHz.

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Section: Introductionmentioning

confidence: 99%

2.5 GHz Wide Band Linear Amplifier with Feedforward Lineariser on a Board

Kayano¹,

Iwata

Sato

et al. 2002

32nd European Microwave Conference, 2002

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“…The amount of power back-off can be reduced by employing the linearizers, resulting in enhanced efficiencies [3]- [4]. Among various linearization techniques, predistortion is the simplest to implement and can be realized in a small area, making it most compatible with MMIC implementation [SI- [6]. The reported predistorters were, however, "passive" and resulted in the 0-7803-7246-8/02/$10.00 0 2002 IEEE insertion losses ranging from several dB to more than 10dB.…”

Section: Introductionmentioning

confidence: 99%

A new "active" predistortor with high gain using cascode-FET structures

Jeon

Kim

Kang³

et al.

2002 IEEE Radio Frequency Integrated Circuits (RFIC) Symposium. Digest of Papers (Cat. No.02CH37280)

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An MMIC-compatible miniaturized "active" predistorter using cascode FET structures is presented. The predistorter has gain expansion and negative phase deviation characteristics required to compensate for the distortion of typical power amplifiers. Unlike the previously reported predistorters, the predistorter of this work is capable of providing gain as high as 7-17 dB, eliminating the need for additional buffer amplifiers. This makes our approach well suited to MMIC implementation. Analysis of gain and phase deviation was also conducted. From the analysis, the origin of nonlinear distortion of predistorter was found to be G, of the upper PET and &, of the lower FET. The predistorter of this work was applied to linearize a 2-GHz MMIC power amplifier for CDMA handset applications. ACPR improvement of 5 dB was achieved.

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Twin nonlinearity generator‐based analog predistorter for small‐cell power amplifiers

Huang

Liu

et al. 2022

Int J RF Mic Comp-Aid Eng

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In this article, a simple analog predistorter (APD), named twin nonlinearity generator based APD (TNG-APD) using the pseudomorphic high electron mobility transistor (pHEMT), is proposed for linearizing small-cell radio frequency power amplifiers (RFPAs) in the fifth-generation mobile communication system (5G). The TNG-APD is composed of two cascaded common-source field effect transistors (FETs) and a phase shifter. To verify the linearization, a TNG-APD circuit operating at central frequency of 3.5 GHz is fabricated to linearize wideband RFPAs. The RFPA under the test in this article is a 1-W RFPA for 5G small-cell basestations. The measurement results show that the adjacent channel power ratio (ACPR) of the RFPA is suppressed by more than 15 dB under a 100 MHz bandwidth 5G new radio (5G-NR) signal with simultaneous quadrature phase shift keying (QPSK) modulation and 256-quadrature amplitude modulation (256QAM), and more than 7 dB under a 200 MHz bandwidth 64 QAM signal. The measured error vector magnitude (EVM) under the 100 MHz 5G-NR signal is improved from 6.2% to 2.3%. Therefore, the proposed TNG-APD has high potential to linearize wideband RFPAs in the 5G small-cell basestation.

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Development of a compact, broadband FET linearizer for satellite use

Cited by 13 publications

References 5 publications

2.5 GHz Wide Band Linear Amplifier with Feedforward Lineariser on a Board

2.5 GHz Wide Band Linear Amplifier with Feedforward Lineariser on a Board

A new "active" predistortor with high gain using cascode-FET structures

Twin nonlinearity generator‐based analog predistorter for small‐cell power amplifiers

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