A Robust GSM/EDGE Transmitter Using Polar Modulation Techniques

Mayer, Christopher; Neurauter, B.; Marzinger, G.; Munker, C.; Hagelauer, R.

doi:10.1109/ecwt.2005.1617663

Cited by 10 publications

(6 citation statements)

References 5 publications

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“…in [9] and [6]. Herein the pulse-shaped IQ-signal (1 Already known is the impact on the out-of-band spectrum due to time-alignment mismatch between amplitude-and phase-signal or DC-offset in amplitude [5][6] [7].…”

Section: Alternatives Of Realizationmentioning

confidence: 99%

On the Spectral Regrowth in Polar Transmitters

Strasser

Lindner

Maurer³

et al. 2006

2006 IEEE MTT-S International Microwave Symposium Digest

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The envelope elimination and restoration (EER) or so called polar transmission concept proposes significant power efficiency increase for the power amplifier (PA). Up to now no products or prototypes have been published, which are able to handle complex and wideband modulation standards like WCDMA, and concurrently fulfill the spectrum emission mask completely. This paper shows the background, why polar modulation causes spectral regrowth, and why it is not possible to overcome this by simple filtering.

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Section: Alternatives Of Realizationmentioning

confidence: 99%

On the Spectral Regrowth in Polar Transmitters

Strasser

Lindner

Maurer³

et al. 2006

2006 IEEE MTT-S International Microwave Symposium Digest

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“…With an envelope range of 0.22-1.44 V [16] for 8PSK, for the power supply of 1.8 V, the normalized envelope range of 0.12-0.80 is achieved. That means the minimum and average conduction time of the power switch are 0.06/f IF and 0.23/f IF , which inversely set the maximum and average switching frequencies f IF /0.12 and f IF /0.46 for the power switch, respectively.…”

Section: Envelope Path Implementationmentioning

confidence: 99%

“…Considering K VCO of a few MHz/V (such as 5 MHz/V) and baseband frequency component f in of −340-340 kHz [16] for 8PSK, the VCO with differential architecture features high tuning linearity under small input voltage V MOD (such as −70-70 mV). Modulation linearity is further improved by introducing a tuning-curve compensation module, which detects and eliminates the slight tuning distortion from the VCO differential varactor pair.…”

Section: Architecturementioning

confidence: 99%

Polar Transmitter with Differential DSM Phase and Digital PWM Envelope

Zhou

Liu²

2014

JSTS:Journal of Semiconductor Technology and Science

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Abstract-A low-power low-cost polar transmitter for EDGE is designed in 0.18µm CMOS. A differential delta-sigma modulator (DSM) tunes a three-terminal voltage-controlled oscillator (VCO) to perform RF phase modulation, where the VCO tuning curve is digitally pre-compensated for high linearity and the carrier frequency is calibrated by a dual-mode lowpower frequency-locked loop (FLL). A digital intermediate-frequency (IF) pulse-width modulator (PWM) drives a complementary power-switch followed by an LC filter to achieve envelope modulation with high efficiency. The proposed transmitter with 9mW power dissipation relaxes the time alignment between the phase and envelope modulations, and achieves an error vector magnitude (EVM) of 4% and phase noise of −123dBc/Hz at 400kHz offset frequency.

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“…Polar transmitters can achieve both high power efficiency and good linearity and become growing popular in modern wireless systems [ 1 , 2 ]. Polar modulation utilizes envelope A and phase Φ components to represent the baseband symbols instead of the conventional I / Q format.…”

Section: Introductionmentioning

confidence: 99%

A Low-Noise Delta-Sigma Phase Modulator for Polar Transmitters

Zhou

2014

The Scientific World Journal

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A low-noise phase modulator, using finite-impulse-response (FIR) filtering embedded delta-sigma (ΔΣ) fractional-N phase-locked loop (PLL), is fabricated in 0.18 μm CMOS for GSM/EDGE polar transmitters. A simplified digital compensation filter with inverse-FIR and -PLL features is proposed to trade off the transmitter noise and linearity. Experimental results show that the presented architecture performs RF phase modulation well with 20 mW power dissipation from 1.6 V supply and achieves the root-mean-square (rms) and peak phase errors of 4° and 8.5°, respectively. The measured and simulated phase noises of −104 dBc/Hz and −120 dBc/Hz at 400-kHz offset from 1.8-GHz carrier frequency are observed, respectively.

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A Robust GSM/EDGE Transmitter Using Polar Modulation Techniques

Cited by 10 publications

References 5 publications

On the Spectral Regrowth in Polar Transmitters

On the Spectral Regrowth in Polar Transmitters

Polar Transmitter with Differential DSM Phase and Digital PWM Envelope

A Low-Noise Delta-Sigma Phase Modulator for Polar Transmitters

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