Reconfigurable RF PWM PA architecture for efficiency enhancement at power back-off

Francois, Brecht; Reynaert, Patrick

doi:10.1109/inmmic.2014.6815090

Cited by 2 publications

(1 citation statement)

References 8 publications

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“…Another application of multilevel PWMs is in switch-mode power amplifiers which are crucial components of modern day Radio Frequency (RF) transmitters used in wireless communication systems. The key metric for evaluating the performance of a switchmode power amplifiers is called the power coding efficiency (see Zhu, Ma, Duan, Mukai, Shinjo, and Teo (2014), Chung, Ma, Teo, and Parsons (2015), Francois and Reynaert (2014)). The power coding efficiency is defined as the ratio of the prescribed in-band power to the total band power of the digitized signal.…”

Section: Introductionmentioning

confidence: 99%

A linear programming approach for designing multilevel PWM waveforms

Mohan

Bhikkaji

Poongothai

et al. 2020

International Journal of Control

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This paper considers the problem of designing a multilevel pulse width modulated waveform (PWM) with a prescribed harmonic content. Multilevel PWM design plays a major role in many diverse engineering disciplines. In power electronics, multilevel PWM design corresponds to determining the inverter switching times and levels for selective harmonic elimination and harmonic compensation. In mechatronics, the same design corresponds to shaping input signals to damp residual vibrations in flexible structures. More generally, in most applications, the aim of PWM design is to minimize the total harmonic distortion while adhering to a prescribed harmonic content. The solution approach presented in this paper is based on linear programming with the objective of minimizing the total harmonic distortion. This objective is achieved within an arbitrarily small bound of the optimal solution. In addition, the linear programming formulation makes the design of such switching waveforms computationally tractable and efficient. Simulations are provided for corroboration.

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Section: Introductionmentioning

confidence: 99%

A linear programming approach for designing multilevel PWM waveforms

Mohan

Bhikkaji

Poongothai

et al. 2020

International Journal of Control

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Predistortion of Digital RF PWM Signals Considering Conditional Memory

Seebacher

Singerl

Schuberth

et al. 2015

IEEE Trans. Circuits Syst. I

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The trend in transmitter systems is to move the digital domain closer towards the antenna using digital modulators and drivers to reduce circuit complexity and to save power. A common assumption made is that they are capable of generating ideal pulses and thus do not suffer from analog imperfections. But the output signals of real drivers for high frequency operation are not perfectly rectangular anymore, which leads to distortion lowering the signal quality. In this paper the general properties of high frequency digital driver circuits operating at 2.6 GHz are analyzed and the impact of the different effects is presented. The predistortion of such drivers in the context of digital discrete time RF PWM modulators is studied. It has been found that conventional sample based predistortion can only correct the driver nonlinearity from 29 dBc to 49 dBc for the example considered using a 40 MHz bandwidth signal at 2.6 GHz. Therefore a special predistortion scheme considering the impact of pulses adjacent to the other samples is proposed. The mitigation of effects due to the discrete time nature of the signal is considered and discussed in detail. The capabilities of the proposed predistortion scheme are verified by extensive simulations as well as by measurements. By applying the proposed predistortion concept the spectral quality can be further improved to 66 dBc. In addition different scenarios with limited resolution and a carrier frequency offset are analyzed.

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Reconfigurable RF PWM PA architecture for efficiency enhancement at power back-off

Cited by 2 publications

References 8 publications

A linear programming approach for designing multilevel PWM waveforms

A linear programming approach for designing multilevel PWM waveforms

Predistortion of Digital RF PWM Signals Considering Conditional Memory

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