Optimum design of a predistortion RF power amplifier for multicarrier WCDMA applications

Cha, Jeonghyeon; Yi, Jaehyok; Kim, J.; Kim, Bumman

doi:10.1109/tmtt.2003.822030

Cited by 55 publications

(3 citation statements)

References 11 publications

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“…To compensate for IMD, several linearization techniques such as predistortion [1], feedback [2], dynamic biasing [3], and feedforward [4]have been developed. The predistortion approach is complex and has problems with bandwidth depending on the method it uses.…”

Section: Introductionmentioning

confidence: 99%

Broadband Tunable Third-Order IMD Cancellation Using Left-Handed Transmission-Line-Based Phase Shifter

Park

Yoo

Kahng

et al. 2015

IEEE Microw. Wireless Compon. Lett.

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We demonstrate a broadband tunable third-order intermodulation distortion (IMD) cancellation architecture using a left-handed transmission line (LHTL)-based phase shifter for a feedforward amplifier. The fabricated circuit reduces the thirdorder IMD of the main amplifier up to 17 dB after adjusting for any frequencies between 1.5 and 2.4 GHz when the frequency difference between the two tones is 2 MHz. In addition, the circuit maintains a spurious-free dynamic range that is greater than 55 dBc at the output. This effective broadband third-order IMD cancellation method is possible because of the broadband and linearly phase-tunable characteristics of the LHTL-based phase shifter.

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Section: Introductionmentioning

confidence: 99%

Broadband Tunable Third-Order IMD Cancellation Using Left-Handed Transmission-Line-Based Phase Shifter

Park

Yoo

Kahng

et al. 2015

IEEE Microw. Wireless Compon. Lett.

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show abstract

“…As described in Ref. 1, there are three main methods to linearize the power amplifiers: feedback [2, 3], predistortion [4, 5], and feedforward [6–9]. The predistortion approach is relatively simple and easy to implement, but its application is limited due to the amount of nonlinear products cancellation.…”

Section: Introductionmentioning

confidence: 99%

A 1.2‐ to 3‐GHz tunable feedforward amplifier using broadband distributed phase shifters

Xiao

Cha

et al. 2011

Micro & Optical Tech Letters

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In this article, a compact printed strip MIMO antenna with an embedded chip inductor for LTE/WCDMA/WiBro applications was proposed. The proposed MIMO antenna consists of a simple two-strip PIFA and embedded chip inductor. The antenna's lower and upper band resonances are contributed by the longer and shorter strips, respectively. The fabricated antenna has the isolation of about 17 dB at the lower band and higher than 17 dB at the higher band. The simulated and measured results show that the proposed multiband MIMO antenna could be a good candidate for the next generation USB Dongle applications.

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“…LINEARITY AND MEMORY EFFECTS Linearization techniques can be used to achieve high linearities (carrier to intermodulation (C/I) ratio). Memory effects, however, which can be defined as changes in the amplitude or phase of distortion components (IMD) caused by changes in modulation frequency (∆ω), restrict the linearization techniques for devices exhibiting memory [1] [2].…”

mentioning

confidence: 99%

Investigation of electrical base-band memory effects in high-power 20W LDMOS transistors using IF passive load pull

Alghanim

Benedikt

Tasker

2008

2008 3rd International Conference on Information and Communication Technologies: From Theory to Applications

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Memory effects are complex phenomena that present major problems in modern high-power linear microwave PA design. Specifically, these effects have a profound influence on spectral symmetry and modulation frequency sensitivity, consequently impacting overall linearity and most importantly, the suitability of a Power Amplifier (PA) to linearisation through pre-distortion. This paper presents detailed, two-tone modulated measurements that clearly show how electrical memory, introduced by non-ideal low-frequency base-band impedances, represents the most significant contributor to overall observed memory effects in high-power LDMOS PA design. The analysis is achieved through the characterisation of a 20W LDMOS device at 2.1 GHz using two-tone excitation and a purpose-built, highpower measurement system, which enables the collection of both RF and IF voltage and current waveforms, together with all associated impedances.

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Optimum design of a predistortion RF power amplifier for multicarrier WCDMA applications

Cited by 55 publications

References 11 publications

Broadband Tunable Third-Order IMD Cancellation Using Left-Handed Transmission-Line-Based Phase Shifter

Broadband Tunable Third-Order IMD Cancellation Using Left-Handed Transmission-Line-Based Phase Shifter

A 1.2‐ to 3‐GHz tunable feedforward amplifier using broadband distributed phase shifters

Investigation of electrical base-band memory effects in high-power 20W LDMOS transistors using IF passive load pull

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