System-Efficiency Analysis of Power Amplifier Supply-Tracking Regimes in Mobile Transmitters

Minnis, B.J.; Moore, Paul A.; Whatmough, Paul N.; Blanken, P.G.; Heijden, Mark P. van der

doi:10.1109/tcsi.2008.927013

Cited by 24 publications

(22 citation statements)

References 11 publications

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“…Several solutions for the envelope amplifier can be found, such as a simple buck converter (class S modulator) in [3]- [5], multiphase buck converter in [6], three-level converter in [7] or linear-assisted switching amplifier in [8]- [10]. These solutions do not exceed the bandwidth of a few hundred kHz and the output power ranges from mW up to several tens of watts.…”

Section: (T) Arct G (F|) a { T)mentioning

confidence: 99%

Envelope Amplifier Based on Switching Capacitors for High-Efficiency RF Amplifiers

Vasić¹,

García²,

Oliver³

et al. 2012

IEEE Trans. Power Electron.

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Abstract-Modern transmitters usually have to amplify and transmit signals with simultaneous envelope and phase modulation. Due to this property of the transmitted signal, linear power amplifiers (class A, B, or AB) are usually used as a solution for the power amplifier stage. These amplifiers have high linearity, but suffer from low efficiency when the transmitted signal has high peak-to-average power ratio. The Kahn envelope elimination and restoration technique is used to enhance the efficiency of RF transmitters, by combining highly efficient, nonlinear RF amplifier (class E) with a highly efficient envelope amplifier in order to obtain a linear and highly efficient RF amplifier. This paper presents a solution for the envelope amplifier based on a multilevel converter in series with a linear regulator. The multilevel converter is implemented by employing voltage dividers based on switching capacitors. The implemented envelope amplifier can reproduce any signal with a maximum spectral component of 2 MHz and give instantaneous maximum power of 50 W. The efficiency measurements show that when the signals with low average value are transmitted, the implemented prototypes have up to 20% higher efficiency than linear regulators used as a conventional solution.

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Section: (T) Arct G (F|) a { T)mentioning

confidence: 99%

Envelope Amplifier Based on Switching Capacitors for High-Efficiency RF Amplifiers

Vasić¹,

García²,

Oliver³

et al. 2012

IEEE Trans. Power Electron.

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“…When the antenna efficiency is increased, the smaller amount of RF power is needed at the antenna input terminals in order to maintain equal radiated power. The efficiency of PA is strongly dependent on its output power level and typically decreases at the lower power levels [13], [14]. Thus, 3 dB increased antenna efficiency does not automatically have a direct 3 dB influence on the RF power consumption.…”

Section: Effect On the Rf Power Consumptionmentioning

confidence: 99%

Effect of the mobile terminal antenna efficiency on the cellular network issues

Berg

Sonkki

Myllymäki

et al. 2012

2012 6th European Conference on Antennas and Propagation (EUCAP)

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In this paper, the effect of the mobile terminal antenna efficiency on the RF power consumption and the link distance, that is cell radius, is discussed. An equation connecting the link distance, antenna efficiency, and path loss exponent is derived. Link distance is calculated with the different antenna efficiency values and with different cell scenarios based on 3GPP and ITU-A channel models. It is demonstrated that the compensation for the user effect has a positive impact both on the RF power consumption and on the theoretical link distance.

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“…This means that less energy is dissipated as heat and the recharge cycle of the battery is prolonged. The efficiency of state-of-the-art commercial power amplifiers for GSM is about 60% while it is about 45% for the CDMA based modulation schemes defined in IMT-2000 [15].…”

Section: Heat Dissipationmentioning

confidence: 99%