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- Title
Power‐efficient burst‐mode RF transmitter based on reference‐adaptive multilevel pulse‐width modulation.
- Authors
Arian, Amir; Jannesari, Abumoslem
- Abstract
Summary: Burst‐mode operation of power amplifier (PA) based on multilevel pulse‐width modulation (MPWM) has been frequently discussed as a potential solution to achieve higher efficiency in radio frequency (RF) transmitters. In this paper, a novel multilevel PWM modulator is proposed that utilizes adaptive triangular reference waveforms. As compared with conventional MPWM modulators, the proposed architecture provides significant wider design space such that the efficiency of system can be effectively optimized. A general transmitter architecture based on the proposed concept is analyzed in terms of power efficiency. Efficiency optimization procedures are presented according to input magnitude statistics. Based on the proposed modulator, an optimized 2.4‐GHz RF transmitter is designed in a 0.18‐μm complementary metal‐oxide‐semiconductor (CMOS) process. The circuit‐level simulations show that it delivers 25.8‐dBm peak output power with 46.1% peak efficiency. For a 20‐MHz worldwide interoperability for microwave access (WiMAX) signal with 8.5‐dB peak‐to‐average‐power ratio (PAPR), this transmitter achieves 28.8% (average) efficiency at 17.3‐dBm (average) output power with an error vector magnitude (EVM) of 2.97% rms.
- Subjects
RADIO transmitter-receivers; PULSE width modulation; POWER amplifiers; RADIO frequency integrated circuits; COMPLEMENTARY metal oxide semiconductors
- Publication
International Journal of Circuit Theory & Applications, 2018, Vol 46, Issue 3, p427
- ISSN
0098-9886
- Publication type
Article
- DOI
10.1002/cta.2394