Bandwidth Reduction for Supply Modulated RF PAs Using Power Envelope Tracking

Olavsbraten, Morten; Gecan, Dragan

doi:10.1109/lmwc.2017.2679046

Cited by 22 publications

(17 citation statements)

References 4 publications

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“…Furthermore, the bandwidth requirements of the tracking signal, and hence the requirements of an eventual ET modulator, can also be reduced when using the appropriate envelope shaping function. This results in a modest requirement of bandwidth with only a small degradation in efficiency and linearity [4] -very important design information. Hence, the ability to precisely adjust the shaping of the baseband tracking signals is needed to optimise the efficiency and linearity of the ET-PA and to explore the design space that results.…”

Section: B Shaping Functionsmentioning

confidence: 99%

Simplify an Envelope Tracking Measurement with Compact System

Alsahali¹

2020

IJMTST

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This paper presents a compact measurement system to simplify the complexity measurement for envelope tracking PA (ET-PA). The requirements for such system are discussed. Then, the measurement setup is used to validate these requirements with a 10 MHz LTE signals at 1.8 GHz. The devices which are used in the measurement are a GaAs FET PA, a linear amplifier and a current sensor. The measurement shows how the alignment between the RF signal and tracking signal achieved practically and the average DE of the test PA with fixed bias increases from 22.6 % to 43.9 % with 48.5 % under ET mode. The instantaneous efficiency measurement shows potential improvement when ET used. Also, the AM-AM and AM-PM distortions were reduced using generalised memory polynomial (GMP).

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Section: B Shaping Functionsmentioning

confidence: 99%

Simplify an Envelope Tracking Measurement with Compact System

Alsahali¹

2020

IJMTST

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“…In this approach, the supply voltage changes dynamically with the input amplitude of the modulated drive signal, keeping the amplifier in compressed efficient operation [10]. Continuous supply modulators, usually based on a fast DC-DC converter [11,12], have limited slew rates if operated efficiently, with degraded performance for higher bandwidth signals [11,13]. Alternative discrete supply modulators (DSM), usually based on a bank of switches [14][15][16], approximate the continuous supply modulator voltage, and can be operated with a lower switching speed and thus perform better for broadband signals [14].…”

Section: Introductionmentioning

confidence: 99%

Distortion mitigation for 100 and 250 MHz discrete supply modulation of a three-stage K-band MMIC PA

Duffy

Lasser²,

Popović³

2020

Int. J. Microw. Wireless Technol.

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Abstract This paper presents a high-efficiency linear GaN K-band transmitter for broadband high peak-average power ratio (PAPR) signals. A GaN MMIC 18.5–24 GHz three-stage power amplifier with over 4 W peak output power, 20 dB saturated gain, and 40% peak PAE is supply-modulated with a four-level discrete dynamic supply GaN MMIC. For 100 MHz signals with ${\rm PAPR}\gt 10\, {\rm dB}$ , we demonstrate an average efficiency improvement from 14 to 20% with a simultaneous linearity improvement in noise power ratio (NPR) from 23 to 26 dB through a shaping function focused on gain linearization. For 250 MHz signal bandwidth, there is no observed degradation in NPR and the efficiency is improved by 5 percentage points. For discrete supply modulation, the switching transients between levels are experimentally investigated for wideband signals.

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“…in [10, 11]. Methods exist to overcome the instantaneous bandwidth limitation of continuous tracking as analysed in [10, 12]. Alternatively, in discrete SM, the drain voltage can vary between a fixed number of predetermined levels.…”

Section: Introductionmentioning

confidence: 99%