A 60% PAE WCDMA Handset Transmitter Amplifier

Warr, Paul A; Morris, Kevin; Watkins, GT; Horseman, Tony R; Takasuka, K.; Ueda, Y.; Kobayashi, Yuta; Miya, S.

doi:10.1109/tmtt.2009.2029021

Cited by 11 publications

(2 citation statements)

References 12 publications

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“…It is not appropriate though to compare the results for an ET modulators optimized for LTE with one for WCMDA since the two signals have different characteristics. Approximately 80% of an LTE's envelope signal power falls within the SMPS's bandwidth, whereas for WCDMA it is 93% [21]. LTE also has a larger PAPR than WCDMA.…”

Section: Resultsmentioning

confidence: 99%

High linearity lead-lag style envelope modulator for RF power amplifiers

Watkins

Mimis

2015

Int. J. Microw. Wireless Technol.

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A new split frequency envelope modulator for envelope tracking radio-frequency power amplifiers is proposed based on a lead-lag network. By mathematically deriving the transfer functions of the lead-lag modulator and the conventional split frequency type, the lead-lag is shown to have a significantly flatter phase response. The frequency response of the two modulators is verified by simulation, where the phase transient of the lead-lag is significantly less than the 360° of the conventional type. They are further simulated with a 3 MHz bandwidth 3GPP long-term evolution (LTE) signal and the lead-lag shown to reduce the modulator's normalized root-mean-square error (NRMSE) from −27.3 to −39.2 dB. A practical demonstrator was developed around an existing high-efficiency modulator architecture. To maintain system efficiency synthetic impedance was incorporated in the low-frequency switched mode power supply (SMPS) path. This was achieved with voltage and current feedback around the SMPS. The dynamic wideband signal response was investigated by applying a 3 MHz LTE envelope signal to the modulator and comparing the input and output signals. The measured NRMSE was improved from −27.5 to −30.0 dB by adopting the lead-lag structure and the dynamic frequency response verifies correct operation.

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Section: Resultsmentioning

confidence: 99%

High linearity lead-lag style envelope modulator for RF power amplifiers

Watkins

Mimis

2015

Int. J. Microw. Wireless Technol.

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“…Nowadays, there are already several practical implementations of some of the aforementioned transmitter architectures not only on the handset level but also in base stations both with ET and EER systems and with some hybrid approaches, proving that the theoretical predictions are correct and that these topologies can achieve high output powers (tenths of watts), delivered with very good efficiency (>50%) and in a very linear way (ACPR > 45 dB), [18][19][20][21].…”

Section: Emerging Wireless Transmitter Architecturesmentioning

confidence: 99%

Wireless transmitter capabilities through supply modulation

Cabral

Cabria

Rodrigues

et al. 2010

Int J RF and Microwave Comp Aid Eng

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In this overview article, the effective capabilities of power amplifiers and wireless transmitters operating under supply modulation will be addressed. Special attention will be paid to: (i) identification of the circuit and system level limiting factors, (ii) possible ways of overcoming them, and (iii) analysis and implementation of one CDMA2000 polar transmitter. This is believed to offer the reader a comprehensive understanding of the overall transmitter behavior and of the underlying constraints that must be accounted for.

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Power Amplifier Supply Modulators

Wolff¹,

Bengtsson²

2019

Wiley Encyclopedia of Electrical and Electronics Engineering

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RF power amplifiers (PAs) are used in mobile communication networks for the amplification of the modulated RF signals. Linear RF PAs suffer from severe efficiency degradation if the output power is reduced and the PA is operated at power back‐off.Dynamic control of the RF PA supply voltage, that is, supply modulation, is an effective method to increase the PA efficiency at reduced output power. The variable supply voltage is generated by the so‐called supply modulator. Designing of such modulators is a challenging task since a large bandwidth in combination with high output power is required. Several topologies for supply modulators have been developed in the past and intensively optimized. This article gives an overview of the available topologies, the challenges with each topology, and the performance of the systems.

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A 60% PAE WCDMA Handset Transmitter Amplifier

Cited by 11 publications

References 12 publications

High linearity lead-lag style envelope modulator for RF power amplifiers

High linearity lead-lag style envelope modulator for RF power amplifiers

Wireless transmitter capabilities through supply modulation

Power Amplifier Supply Modulators

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