A low noise, high efficiency two stage envelope modulator structure for EDGE polar modulation

Qin, Jifeng; Guo, Rong; Park, Jinseok; Huang, Alex Q.

doi:10.1109/iscas.2009.5117949

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…However, the technique is only useful for a constant envelope signal like Global system for mobile communications (GSM). In [16], an auxiliary branch of an envelope modulator, which works with the opposite phase of the main branch, is connected in parallel to cancel the ripple of an output signal. However, two large output inductors are needed.…”

Section: Introductionmentioning

confidence: 99%

0.7–1.8 GHz multiband digital polar transmitter using watt-class current-mode class-D CMOS power amplifier and digital envelope modulation technique for reduced spurious emissions

Nakatani

Kimball

Larson

et al. 2013

Int. J. Microw. Wireless Technol.

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A polar transmitter driven by digital input signals for envelope and phase is demonstrated, using a band-switching output resonator to achieve multiband operation. A new digital pulse width modulation algorithm is also shown to partially suppress spurious signals associated with the digital input envelope signal. The transmitter consists of a current-mode class-D (CMCD) CMOS power amplifier (PA), together with a buck converter with a dead-time generator for improved efficiency. The CMCD PA is tuned by band-switching capacitors that can handle up to 9 V, and is measured to have approximately 30 dBm output power with 31–35% drain efficiency under single-tone testing. The proposed spurious signal reduction technique works to partially suppress quantization noise without increasing power consumption. Overall efficiencies of 27.1/25.6% are obtained at 30.2/28.9 dBm continuous wave (CW) output powers and 0.85/1.75 GHz carrier frequencies, respectively. Spur suppression of 9–10 dB peak is achieved when the proposed algorithm is applied with wideband code division multiple access (WCDMA) modulation.

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Section: Introductionmentioning

confidence: 99%

0.7–1.8 GHz multiband digital polar transmitter using watt-class current-mode class-D CMOS power amplifier and digital envelope modulation technique for reduced spurious emissions

Nakatani

Kimball

Larson

et al. 2013

Int. J. Microw. Wireless Technol.

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show abstract

“…Such highly linear amplifiers are inefficient, particularly at ''backed-off'' power conditions, where the power amplifier typically operates for most of its operating time. Polar modulation is an effective technique to alleviate the linearity-efficiency tradeoff [1][2][3]. As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

High efficiency, high switching speed, AlGaAs/GaAs P-HEMT DC–DC converter for integrated power amplifier modules

Peng

Pala

Wright³

et al. 2010

Analog Integr Circ Sig Process

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This paper presents a high efficiency, high switching frequency DC-DC buck converter in AlGaAs/ GaAs technology, targeting integrated power amplifier modules for wireless communications. The switch mode, inductor load DC-DC converter adopts an interleaved structure with negatively coupled inductors. Analysis of the effect of negative coupling on the steady state and transient response of the converter is given. The coupling factor is selected to achieve a maximum power efficiency under a given duty cycle with a minimum penalty on the current ripple performance. The DC-DC converter is implemented in 0.5 lm GaAs p-HEMT process and occupies 2 9 2.1 mm 2 without the output network. An 8.7 nH filter inductor is implemented in 65 lm thick top copper metal layer, and flip chip bonded to the DC-DC converter board. The integrated inductor achieves a quality factor of 26 at 150 MHz. The proposed converter converts 4.5 V input to 3.3 V output for 1 A load current under 150 MHz switching frequency with a measured power efficiency of 84%, which is one of the highest efficiencies reported to date for similar current/voltage ratings.

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A low noise, high efficiency two stage envelope modulator structure for EDGE polar modulation

Cited by 2 publications

References 9 publications

0.7–1.8 GHz multiband digital polar transmitter using watt-class current-mode class-D CMOS power amplifier and digital envelope modulation technique for reduced spurious emissions

0.7–1.8 GHz multiband digital polar transmitter using watt-class current-mode class-D CMOS power amplifier and digital envelope modulation technique for reduced spurious emissions

High efficiency, high switching speed, AlGaAs/GaAs P-HEMT DC–DC converter for integrated power amplifier modules

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