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This paper describes a novel concept to encode amplitude and phase information in binary waveforms for switch-mode power amplifiers (SMPAs). A combination of a phase-modulated delta-sigma modulation (DSM) and pulse-width modulation (PWM) makes it possible to adapt signal generation to the power amplifier limits. The proposed system overcomes the inherent signal quality limits of digital systems with...
This paper describes a novel concept to encode amplitude and phase information in binary waveforms for switch-mode power amplifiers (SMPAs). A combination of a phase-modulated delta-sigma modulation (DSM) and pulse-width modulation (PWM) makes it possible to adapt signal generation to the power amplifier limits. The proposed system overcomes the inherent signal quality limits of digital systems with...
This paper presents new architectures for RF pulse width modulation (RF-PWM). They allow for very efficient and simple implementation of this class of modulators. Even for the 2.6-Ghz band, the modulator can now be built with standard components. The new concepts support binary and M-ary output alphabets. One variant is capable of generating M-ary RF-PWM signals by only deploying one switching device...
We show a universal analog signal conditioning approach for switch-mode power amplifiers. Three novel RF-PWM concepts are implemented on PCB, which work with a single RF input. The modulation-inherent distortion is compensated by a dedicated predistortion. We evaluated the performance for base stations of mobile communications in terms of ACLR, EVM, coding efficiency and channel power from 400MHz...
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