High-Efficiency Envelope-Tracking W-CDMA Base-Station Amplifier Using GaN HFETs

Kimball, D.; Jeong, Jinho; Hsia, Chin; Draxler, P.; Lanfranco, Sandro; Nagy, W.; Linthicum, K. J.; Larson, L.E.; Asbeck, P.M.

doi:10.1109/tmtt.2006.884685

Cited by 258 publications

(89 citation statements)

References 16 publications

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“…OFDM-based modulations) require Power Amplifiers (PAs) handling signals that present high Peak-to-Average Power Ratios (PAPRs): this means a tradeoff between linearity and efficiency [1]. Currently, to enhance power efficiency in power amplifiers (PA), powersupply control architectures are being used.…”

Section: Introductionmentioning

confidence: 99%

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A method for real-time generation of slew-rate limited envelopes in envelope tracking transmitters

Montoro

Gilabert

Bertrán

et al. 2010

2010 IEEE International Microwave Workshop Series on RF Front-Ends for Software Defined and Cognitive Radio Solutions (IMWS)

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-This paper shows a method for generating slewrate limited envelopes in order to accomplish the slew-rate restrictions of the envelope driver in envelope tracking transmitters. The proposed algorithm can run in real-time and it is implemented in a digital front-end of a Software Radio system. Simulation results and conclusions are provided to validate the methodology. Moreover, experimental results of an FPGA implementation are also provided.Index Terms -Efficient power amplifiers, envelope tracking, slew-rate.

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Section: Introductionmentioning

confidence: 99%

“…This dynamic supply can be considered as an envelope power amplifier. Its role is to efficiently supply the required voltages and currents to the RF transistor drain at the speed imposed by the changes of the RF envelope [1].…”

Section: Introductionmentioning

confidence: 99%

A method for real-time generation of slew-rate limited envelopes in envelope tracking transmitters

Montoro

Gilabert

Bertrán

et al. 2010

2010 IEEE International Microwave Workshop Series on RF Front-Ends for Software Defined and Cognitive Radio Solutions (IMWS)

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“…Therefore, the switching frequency can be chosen much lower and switching losses are reduced. Switch-mode assisted linear modulators are widely used (Kimball et al, 2006;Jeong et al, 2009;Hoversten and Popovic, 2010), but suffer from two disadvantages. On the one hand, for very high output powers, the absolute power dissipated in the linear stage becomes very high even if it is small compared to the output power.…”

Section: Class-g Amplifier Architecturementioning

confidence: 99%

Envelope tracking of a radio frequency amplifier for Long Term Evolution using a three-level class-G modulator

et al. 2013

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Abstract. In this contribution, efficiency enhancement of a radio frequency (RF) power amplifier (PA) for Long Term Evolution (LTE) base stations using envelope tracking is investigated. The dynamically adapted drain bias voltage is provided by a three-level class-G modulator. The potential of this bias modulator is demonstrated with a class AB PA built in gallium nitride (GaN) technology with an operation frequency of 2.75 GHz, a maximum output power of 41 dBm and a peak power-added efficiency (PAE) of 60 %. When driven by an LTE signal with a bandwidth of 20 MHz, overall system efficiency can be increased from 17 % with a constant supply voltage up to 29 % with envelope tracking. This is accompanied by a reduction of linearity. Adjacent channel leakage ratio (ACLR) decreases by 10 dB in the first and by 18 dB in the second adjacent channel, respectively. Error vector magnitude (EVM) increases from 9 % up to 29 %.

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“…This term can be determined by investigating the AM-PM performance of PAs with frequency. In this work, the simulation using Agilent ADS is performed to extract the frequency dependent AM-PM performance of a 150-W class-AB GaN PA presented in [9]. It is shown in [9] that the device model developed by the author is accurate enough to well predict the gain, output power, efficiency and linearity performance of the PA.…”

Section: Proposed Dpd Techniquementioning

confidence: 99%

New digital predistortion technique of RF power amplifiers for wideband OFDM signals

Jeong

2012

IEICE Electron. Express

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Abstract:A new digital predistortion (DPD) technique is presented for the linearization of RF power amplifiers (PAs) for wideband orthogonal frequency division multiplexing (OFDM) signals. The proposed DPD technique employs the phase correction term to compensate for the frequency dependent AM-PM distortion of PAs, considering the wide bandwidth of OFDM signal. The simulation shows that the proposed DPD technique can significantly improve the error vector magnitude (EVM) performance of RF PAs.

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High-Efficiency Envelope-Tracking W-CDMA Base-Station Amplifier Using GaN HFETs

Cited by 258 publications

References 16 publications

A method for real-time generation of slew-rate limited envelopes in envelope tracking transmitters

A method for real-time generation of slew-rate limited envelopes in envelope tracking transmitters

Envelope tracking of a radio frequency amplifier for Long Term Evolution using a three-level class-G modulator

New digital predistortion technique of RF power amplifiers for wideband OFDM signals

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