A CMOS Envelope Tracking Power Amplifier for LTE Mobile Applications

Ham, Junghyun; Jung, Haeryun; Kim, Hyungchul; Lim, Wonseob; Heo, Deukhyoun; Yang, Youngoo

doi:10.5573/jsts.2014.14.2.235

Cited by 11 publications

(6 citation statements)

References 29 publications

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“…The power losses in MOSFET transistors in switching-mode converters are divided into switching and conduction power losses [7]: The switching losses in the hard-switched buck dc-dc converter can be expressed by formula [8]:…”

Section: Power Losses In Mosfet Transistors Investigated With Cadence...mentioning

confidence: 99%

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Power losses in the MOSFET transistors of switching-mode converters

Kunov,

Brusev,

Gadjeva

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The power losses in the MOSFET transistors of switching-mode converters are investigated and analyzed. The results presented in this paper are achieved using software Cadence OrCAD. The simulation model suitable for estimation of energy dissipations in MOSFET transistors is proposed. The power losses as a function of different circuit’s parameters, like switching frequency, power supply voltage and output current are evaluated. The PSpice model of MOSFET transistor “BSC020N03MS” of the company Infineon is used in the presented analysis. Control circuit, which realize the adaptive deadtime (ADT) control technique depending on the load current, is applied to reduce the switching power losses in the MOSFET transistor. Thus, the efficiency of the switching-mode converters can be increased.

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Section: Power Losses In Mosfet Transistors Investigated With Cadence...mentioning

confidence: 99%

“…The major function in the converters is played by the switches [4]. On the other hand, they are one of the most energy consuming components in the switching-mode converters [5]. The output power transistors have the big impact over the efficiency of the whole converter's system.…”

Section: Introductionmentioning

confidence: 99%

Power losses in the MOSFET transistors of switching-mode converters

Kunov,

Brusev,

Gadjeva

2023

IOP Conf. Ser.: Mater. Sci. Eng.

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“…However, the back‐off operation in power significantly decreases the efficiency of the PAs. For efficiency enhancement, several techniques have been researched, such as Doherty, envelope elimination and restoration, and envelope tracking (ET) . Among these techniques, ET shows a considerable efficiency improvement without significantly deteriorating linearity performance.…”

Section: Introductionmentioning

confidence: 99%

“…The ET PA consists of a supply modulator and a PA. Generally, the supply modulator is based on a hybrid buck converter which has a linear amplifier for wide bandwidth and a switching amplifier for high efficiency . The hybrid buck converter has a significant degradation of efficiency for low output power due to the power consumption of the linear amplifier.…”

Section: Introductionmentioning

confidence: 99%

Dual-mode supply modulator for CMOS envelope tracking power amplifier integrated circuit

Ham

Bae

Seo

et al. 2015

Microw. Opt. Technol. Lett.

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A dual‐mode supply modulator is presented for a complementary metal‐oxide semiconductor envelope tracking power amplifier (PA) integrated circuit. The proposed supply modulator, based on a hybrid buck converter, has dual Class‐AB buffers and dual switches for the linear and switching amplifiers, respectively. For high average output power levels [or high‐power mode (HPM)], the supply modulator is controlled to have full sizes for both the buffer and switch to supply peak envelope voltage and high output current to the PA. The supply modulator is reconfigured to have smaller sized Class‐AB buffer and switch for low average output power levels (or low‐power mode). The smaller sized buffer and switch are used to reduce the quiescent current of the linear amplifier and to maintain high efficiency of the switching amplifier for a lightly loaded condition. For the 16‐QAM LTE uplink signal with a channel bandwidth of 5 MHz, the PA with the proposed supply modulator delivered a power‐added efficiency of 46.2% at an average output power of 24 dBm for a high power mode, which shows an improvement of 8.0% compared to the stand‐alone PA. For a low power mode, the PA with a reconfigured supply modulator has a power‐added efficiency of 12% at an output power of 9 dBm, which is a back‐off of 15 dB. This is 1.6 and 7.2% higher than that using the supply modulator for the HPM and for the stand‐alone PA at the same output power, respectively. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1338–1343, 2015

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“…To generate the dynamically varying bias voltage for PAs, the ET technique requires a BM that has high speed and high current supplying capability. A hybrid buck converter which consists of a linear stage and a switching stage has been generally used [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Dual Bias Modulator for Envelope Tracking and Average Power Tracking Modes for CMOS Power Amplifier

Ham¹,

Jung²,

Bae³

et al. 2014

JSTS:Journal of Semiconductor Technology and Science

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Abstract-This paper presents a dual-mode bias modulator (BM) for complementary metal oxide semiconductor (CMOS) power amplifiers (PAs). The BM includes a hybrid buck converter and a normal buck converter for an envelope tracking (ET) mode for high output power and for an average power tracking (APT) mode for low output power, respectively. The dual-mode BM and CMOS PA are designed using a 0.18-mm CMOS process for the 1.75 GHz band. For the 16-QAM LTE signal with a peakto-average power ratio of 7.3 dB and a bandwidth of 5 MHz, the PA with the ET mode exhibited a poweradded efficiency (PAE) of 39.2%, an EVM of 4.8%, a gain of 19.0 dB, and an adjacent channel leakage power ratio of -30 dBc at an average output power of 22 dBm, while the stand-alone PA has a PAE of 8% lower at the same condition. The PA with APT mode has a PAE of 21.3%, which is an improvement of 13.4% from that of the stand-alone PA at an output power of 13 dBm.

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A CMOS Envelope Tracking Power Amplifier for LTE Mobile Applications

Cited by 11 publications

References 29 publications

Power losses in the MOSFET transistors of switching-mode converters

Power losses in the MOSFET transistors of switching-mode converters

Dual-mode supply modulator for CMOS envelope tracking power amplifier integrated circuit

Dual Bias Modulator for Envelope Tracking and Average Power Tracking Modes for CMOS Power Amplifier

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