High-Efficiency Envelope-Tracking Transmitter With Optimized Class-${\hbox{F}}^{-1}$ Amplifier and 2-bit Envelope Amplifier for 3G LTE Base Station

Kim, Joon Hyung; Jo, Gweon Do; Oh, Jung Hoon; Kim, Young Hoon; Lee, Kwang Chun; Jung, Jae Ho; Park, Chul Soon

doi:10.1109/tmtt.2011.2125984

Cited by 17 publications

(4 citation statements)

References 9 publications

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“…It is also used to combine the output power from a half‐CMOS power cell. For continuous injection of

V_{G 2}

not only to keep this trajectory, but also to achieve the flat gain performance, an iso‐gainable tracking method, similar to a previous method, is used here . For the simplicity of implementation, such a calculated

V_{G 2}

is converted into a third order polynomial model.…”

Section: Implementation and Measurementmentioning

confidence: 99%

Linear CMOS power amplifier using continuous gate voltage control

Kim

2018

Micro & Optical Tech Letters

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In this article, an linearization technique using a gate voltage adaptation of a common gate stage for a cascode CMOS power amplifier (PA) is presented. The tracking of minimum in‐band third‐order intermodulation distortion by controlling with respect to instantaneous power level enhances the linearity of CMOS PA over a wide range of operation level. The experimental results show that the CMOS PA with proposed scheme has an overall efficiency of 34.6% and a gain of 25.8 dB at an average output power of 27 dBm. Under this condition, the adjacent channel leakage ratio is <–34.8 and 5.4 dBc lower when compared with the use of no linearization technique.

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“…It is also used to combine the output power from a half‐CMOS power cell. For continuous injection of

V_{G 2}

V_{G 2}

is converted into a third order polynomial model.…”

Section: Implementation and Measurementmentioning

confidence: 99%

Linear CMOS power amplifier using continuous gate voltage control

Kim

2018

Micro & Optical Tech Letters

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“…In other words, in order for AET system to achieve the same system efficiency as the conventional ET system, the EA design requirement can be relaxed. Many EA design approaches in the literature [9,12,13,[15][16][17] for conventional ET systems are quite complex and in conjunction with a pre-distorter to improve linearity can contribute a substantial cost to the overall system design. The EA used for AET WCDMA signal measurement was the source follower amplifier that had been discussed in [18], which is also shown in Fig.…”

Section: Theoretical Background Of the Aet Techniquementioning

confidence: 99%

“…An ET tracking generator only needs to track the general trend of the signal envelope in order to give some degree of efficiency improvement. In particular, the ET generator can present a significantly band-limited version of the signal envelope and still give close to the optimum efficiency enhancement performance [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Simple and low‐cost tracking generator design in envelope tracking radio frequency power amplifier system for WCDMA applications

Yusoff

Lees

Chaudhary

et al. 2013

IET Microwaves, Antennas & Propagation

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A simple analogue technique called auxiliary envelope tracking, or AET, is presented, which is shown to be capable of improving the efficiency of a radio frequency power amplifier (RFPA). This AET signal is an amplified envelope signal that supplies the drain port of the RFPA. The concept of AET is explained and a theoretical background for the technique is presented. The main feature of this technique lies in the separation of the DC and AC components of the tracking signal. This allows for a very simple and low-cost tracking generator design that consists of a simple source follower amplifier and an RF broadband transformer. A practical system has been implemented and the measured results are obtained for WCDMA signals. A measurement on the realised system shows a 50% improvement in the drain efficiency at average output power of 33 dBm of a 25 W GaN. This substantial improvement is achieved at a competitive WCDMA signal with peak-to-average envelope power ratio of 9.17 dB

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“…Además, la relación VDSpeak/Vdd disminuye hasta los 3.077 a 1.56fmax y 2.677 a 2fmax, siendo está relación de 3.56 para un amplificador clase E nominal. Estas cifras son similares a las obtenidas con otras clases de amplificación tales como la amplificación clase F [124], [125] y [126]. La Figura 3.63 representa gráficamente el efecto sobre el rendimiento, sobre la potencia, sobre la tensión y sobre la corriente en función de la frecuencia con respecto a fmax.…”

Section: Funcionamiento Subóptimo En Clase E En Banda Lunclassified

Linealización de amplificadores de potencia de alto rendimiento sobre tecnología GaN mediante técnicas EER/ET

Ramos¹

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High-Efficiency Envelope-Tracking Transmitter With Optimized Class-${\hbox{F}}^{-1}$ Amplifier and 2-bit Envelope Amplifier for 3G LTE Base Station

Cited by 17 publications

References 9 publications

Linear CMOS power amplifier using continuous gate voltage control

Linear CMOS power amplifier using continuous gate voltage control

Simple and low‐cost tracking generator design in envelope tracking radio frequency power amplifier system for WCDMA applications

Linealización de amplificadores de potencia de alto rendimiento sobre tecnología GaN mediante técnicas EER/ET

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