A Novel Digital-Intensive Hybrid Polar-I/Q RF Transmitter Architecture
A novel digital-intensive hybrid transmitter (TX) architecture is presented, combining conventional inphase and quadrature (I/Q) with constrained phase modulation. The proposed architecture utilizes an RF-DAC with phase modulated RF clock and adjusted I/Q components. By incorporating phase modulatio...
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| Veröffentlicht in: | IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2018-12, Vol.65 (12), p.4390-4403 |
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| container_title | IEEE transactions on circuits and systems. I, Regular papers |
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| creator | Buckel, Tobias Preyler, Peter Klinkan, Alexander Hamidovic, Damir Preissl, Christoph Mayer, Thomas Tertinek, Stefan Brandstaetter, Siegfried Wicpalek, Christian Springer, Andreas Weigel, Robert |
| description | A novel digital-intensive hybrid transmitter (TX) architecture is presented, combining conventional inphase and quadrature (I/Q) with constrained phase modulation. The proposed architecture utilizes an RF-DAC with phase modulated RF clock and adjusted I/Q components. By incorporating phase modulation the quadrature component is kept small while the inphase component approaches the complex signal envelope. Compared to a digital-quadrature TX architecture this results in a significantly reduced average and peak RF-DAC cell utilization. Therefore, the RF-DAC can be operated in less back-off at higher average output power and drain efficiency. The phase modulation is constrained in order to relax the phase modulators system requirements. Compared to a digital polar TX architecture utilizing an RF digital phase-locked loop with two-point phase modulation, this results in reduced frequency modulation and digital-controlled oscillator tuning range requirements. In addition, the design effort is further shifted from analog to digital domain in order to better exploit the benefits of CMOS technology scaling. |
| doi_str_mv | 10.1109/TCSI.2018.2840844 |
| format | Article |
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The proposed architecture utilizes an RF-DAC with phase modulated RF clock and adjusted I/Q components. By incorporating phase modulation the quadrature component is kept small while the inphase component approaches the complex signal envelope. Compared to a digital-quadrature TX architecture this results in a significantly reduced average and peak RF-DAC cell utilization. Therefore, the RF-DAC can be operated in less back-off at higher average output power and drain efficiency. The phase modulation is constrained in order to relax the phase modulators system requirements. Compared to a digital polar TX architecture utilizing an RF digital phase-locked loop with two-point phase modulation, this results in reduced frequency modulation and digital-controlled oscillator tuning range requirements. 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Compared to a digital polar TX architecture utilizing an RF digital phase-locked loop with two-point phase modulation, this results in reduced frequency modulation and digital-controlled oscillator tuning range requirements. 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| subjects | CMOS Computer architecture digital polar transmitter digital quadrature transmitter Frequency modulation hybrid polar-I/Q transmitter Microprocessors Modulators Phase locked loops Phase modulation Power efficiency Power generation quadrature modulation Radio frequency RF digital phase-locked loop (RF-DPLL) RF digital power amplifier (RF-DPA) RF digital-to-analog converter (RF-DAC) Tuning Wireless communication |
| title | A Novel Digital-Intensive Hybrid Polar-I/Q RF Transmitter Architecture |
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