Open this publication in new window or tab >>2019 (English)In: IET Circuits, Devices & Systems, ISSN 1751-858X, E-ISSN 1751-8598, Vol. 13, no 3, p. 273-278Article in journal (Refereed) Published
Abstract [en]
Linearity and efficiency are important parameters in determining the performance of any wireless transmitter. Pulse-width modulation (PWM) based transmitters offer high efficiency but suffer from low linearity due to image and aliasing distortions. Although the problem of linearity can be addressed by using an aliasing-free PWM (AF-PWM), these transmitters have a lower efficiency as they can only use linear power amplifiers (PAs). Moreover, an all-digital implementation of such transmitters is not possible. The aliasing-compensated PWM transmitter (AC-PWMT) has a higher efficiency due to the use of switch-mode PAs (SMPAs) but uses outphasing to eliminate image and aliasing distortions and requires a larger silicon area. In this study, the authors propose a novel transmitter that eliminates both aliasing and image distortions while using a single SMPA. The transmitter can be implemented using all-digital techniques and achieves a higher efficiency as compared to both AF-PWM and AC-PWM based transmitters. Measurement results show an improvement of 11.3, 7.2, and 4.3 dBc in the ACLR as compared to the carrier-based PWM transmitter (C-PWMT), AF-PWMT, and AC-PWMT, respectively. The efficiency of the proposed transmitter is similar to that of C-PWMT, which is an improvement of 5% over AF-PWMT.
Place, publisher, year, edition, pages
Institution of Engineering and Technology, 2019
Keywords
all-digital implementation;aliasing-free PWM;wireless transmitter;switch-mode PA;AC-PWM based transmitters;carrier-based PWM transmitter;power-efficient aliasing-free PWM transmitter;Si;aliasing distortions;aliasing-compensated PWM transmitter;pulse-width modulation based transmitters;linear power amplifiers;C-PWMT;AF-PWM;silicon area;
National Category
Signal Processing Computer Vision and Robotics (Autonomous Systems)
Identifiers
urn:nbn:se:liu:diva-156307 (URN)10.1049/iet-cds.2018.5011 (DOI)000470680000002 ()
2019-04-122019-04-122019-07-03Bibliographically approved