A Modified All-Digital Polar PWM Transmitter
| Autor: | Jahanzeb Ahmad, Ted Johansson, Muhammad Touqir Pasha, Muhammad Fahim Ul Haque |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Engineering
business.industry Amplifier 020208 electrical & electronic engineering Transmitter Electrical engineering 020206 networking & telecommunications Data_CODINGANDINFORMATIONTHEORY 02 engineering and technology CMOS Hardware_GENERAL Telecommunications link Hardware_INTEGRATEDCIRCUITS 0202 electrical engineering electronic engineering information engineering Baseband Adjacent channel Electronic engineering Electrical and Electronic Engineering Transceiver business Pulse-width modulation |
| Zdroj: | IEEE Transactions on Circuits and Systems I: Regular Papers. 65:758-768 |
| ISSN: | 1558-0806 1549-8328 |
| DOI: | 10.1109/tcsi.2017.2725980 |
| Popis: | This paper presents an all-digital polar pulsewidth modulated (PWM) transmitter for wireless communications. The transmitter combines baseband PWM and outphasing to compensate for the amplitude error in the transmitted signal due to aliasing and image distortion. The PWM is implemented in a field programmable gate array (FPGA) core. The outphasing is implemented as pulse-position modulation using the FPGA transceivers, which drive two switch-mode power amplifiers fabricated in 130-nm standard CMOS. The transmitter has an all-digital implementation that offers the flexibility to adapt it to multi-standard and multi-band signals. As the proposed transmitter compensates for aliasing and image distortion, an improvement in the linearity and spectral performance is observed as compared with a digital-PWM transmitter. For a 20-MHz LTE uplink signal, the measurement results show an improvement of up to 6.9 dBc in the adjacent channel leakage ratio. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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