Highly efficient uneven multi-level LINC transmitter

Hur, Jae; Lee, O.; Kim, Ketack; Lim, Kyutae; Laskar, J.

doi:10.1049/el.2009.1599

Cited by 30 publications

(24 citation statements)

References 4 publications

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“…1 (a), the concept of UMLINC is to separate the original signal ( ) into two phase-only-modulated signals 1 ( ) and 2 ( ) with minimal outphasing angles to achieve maximal efficiency [3]. This work assumed that the high efficiency PAs can provide two gain modes -high gain and low gain = .…”

Section: A Umlinc Principlementioning

confidence: 99%

“…Nonisolated combiners have been proposed to improve the combining efficiency, but the linearity is sacrificed [2]. Accordingly, uneven multi-level LINC (UMLINC) [3] have been suggested to improve the combining efficiency by reducing the possibility of large outphasing angles. To apply these techniques, the PA implementations with two gain modes have been proposed [4], [5].…”

Section: Introductionmentioning

confidence: 99%

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A low power all-digital signal component separator for uneven multi-level LINC systems

Chen

Tsai

Moitie

et al. 2011

2011 Proceedings of the ESSCIRC (ESSCIRC)

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Section: A Umlinc Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A low power all-digital signal component separator for uneven multi-level LINC systems

Chen

Tsai

Moitie

et al. 2011

2011 Proceedings of the ESSCIRC (ESSCIRC)

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“…The asymmetric LINC [17,18], shown in Fig. 2, changes the supply voltages for each of the two PAs independently, which results in smaller outphasing angles compared to the multi-level LINC, so that higher efficiency can be achieved even in relatively high-PAPR standards, such as OFDM.…”

Section: Asymmetric Lincmentioning

confidence: 99%

“…But both gain-adjusting and envelope-adjusting do not optimize the PA pair for high power efficiency since only the power supply or the input power is controllable. Asymmetric LINC has been reported in [17,18] to improve the efficiency further by using different power supplies for each PA. The drawback of this structure is that two independent multi-level power supplies are required, which not only increases the complexity also introduces the matching issue.…”

Section: Introductionmentioning

confidence: 99%

A LINC-based polar transmitter with reduced envelope bandwidth for wideband communications

Huang

Larsen

2010

Analog Integr Circ Sig Process

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This paper presents a polar transmitter with reduced envelope bandwidth and the linear amplifier with nonlinear components (LINC) technique is used to produce constant-envelope signals according to the remaining envelope information. This architecture relaxes the bandwidth requirement for the traditional envelope modulators. Only the low-frequency part of the envelope signal is amplified to provide power supply for the power amplifier (PA) stage. In the LINC path, the remaining envelope information is modulated into the phase signals, which are used as the radio frequency (RF) input to the nonlinear PA pair. At the RF output, the envelope information is retrieved from these two parts by the supply-modulated PA pair. The simulation results show that the envelope bandwidth is reduced to around one third of the original bandwidth by the proposed technique. For 2-level LINC structures, the combining efficiency of the proposed architecture is improved to more than twice as the one of LINC-only structure since the combining angles are reduced.

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“…Recently, asymmetric multilevel outphasing (AMO) has been proposed for high-efficiency wideband RF transmission [6], [7], [8]. This paper presents the first IC implementation of this technique.…”

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confidence: 99%

A 2.5-GHz asymmetric multilevel outphasing power amplifier in 65-nm CMOS

Godoy

Chung

Barton

et al. 2011

2011 IEEE Topical Conference on Power Amplifiers for Wireless and Radio Applications

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Abstract-We present a high-efficiency transmitter based on asymmetric multilevel outphasing (AMO). AMO transmitters improve their efficiency over LINC (linear amplification using nonlinear components) transmitters by switching the output envelopes of the power amplifiers among a discrete set of levels. This minimizes the occurrence of large outphasing angles, reducing the energy lost in the power combiner. We demonstrate this concept with a 2.5-GHz, 20-dBm peak output power transmitter using 2-level AMO designed in a 65-nm CMOS process. To the authors' knowledge, this IC is the first integrated implementation of the AMO concept. At peak output power, the measured power-added efficiency is 27.8%. For a 16-QAM signal with 6.1dB peak-to-average power ratio, the AMO prototype improves the average efficiency from 4.7% to 10.0% compared to the standard LINC system.Index Terms-power amplifier (PA), outphasing, LINC, asymmetric power combining, asymmetric multilevel outphasing (AMO), digital predistortion Recently, asymmetric multilevel outphasing (AMO) has been proposed for high-efficiency wideband RF transmission [6], [7], [8]. This paper presents the first IC implementation of this technique. AMO improves the classical outphasing power efficiency by switching the output amplitudes of the PAs among a discrete set of levels. In this work, the discrete amplitude changes are accomplished by switching the supply voltages of the PAs. This discrete amplitude modulation reduces the amount of outphasing required, thereby reducing the power lost in the combiner. A block diagram of the AMO system with supply voltage switching is shown in Fig. 1.

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Highly efficient uneven multi-level LINC transmitter

Cited by 30 publications

References 4 publications

A low power all-digital signal component separator for uneven multi-level LINC systems

A low power all-digital signal component separator for uneven multi-level LINC systems

A LINC-based polar transmitter with reduced envelope bandwidth for wideband communications

A 2.5-GHz asymmetric multilevel outphasing power amplifier in 65-nm CMOS

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