Phase-modulated DSM-PWM hybrids with pulse length restriction for switch-mode power amplifiers

Markert, Daniel; Haslach, Christoph; Heimpel, Holger; Pascht, Andreas; Fischer, Georg

doi:10.1109/eumic.2014.6997882

Cited by 1 publication

(1 citation statement)

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“…In contrast, band-pass DSM (BPDSM) is an all-digital implementation, but has a very low coding efficiency which, in turn, lowers the overall efficiency of any real, and thus non-ideal digital PA. (Coding efficiency is defined as the in-band signal power divided by the total power of the signal, including DC.) There have been first efforts to combine (quantized) PWM with DSM in [3]. But while simulation results look promising, actual measurements suffer from low ACLR values.…”

Section: Introductionmentioning

confidence: 99%

A new modulator for digital RF power amplifiers utilizing a wavetable approach

Huhn

Wentzel

Heinrich

2017

Int. J. Microw. Wireless Technol.

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This paper presents for the first time a wavetable-based coding scheme to generate a high-speed binary input signal for digital RF power amplifiers. The approach maximizes the utilization of the time domain handling capabilities of the pulse forming circuit. Key features are a greatly improved output spectrum purity in comparison with common digital modulators, the ability to adjust the modulator to any given pulse forming hardware and a built-in signal correction option that comes without additional computational cost. To give a first impression on the modulators behavior and its possibilities to adapt to different hardware constraints, simulations are carried out for different parameter variations and for different baseband bandwidths. Furthermore, the proposed concept is emulated with an arbitrary waveform generator to gather additional measurement data. For a 5 MHz wideband code division multiple access (WCDMA) signal (6.5 dB peak-to-average power ratio) at 900 MHz, an error vector magnitude (EVM) of 0.26% and better than >58 dB adjacent channel leakage ratio (ACLR) were recorded. To the authors’ knowledge, these are the best values achieved so far for a single-bit coding scheme without digital predistortion that still maintains maximum power coding efficiency.

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Section: Introductionmentioning

confidence: 99%