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A Polar-Transmitter Architecture Using Multiphase Pulsewidth Modulation
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DOI：10.1109/TCSI.2010.2071918.png)
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摘要
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This paper presents a transmitter architecture based on a pulse-modulated polar transmitter using multiphase pulsewidth modulation. The modulation to the radio-frequency input signal, instead of conventional drain modulation, significantly reduces the circuit complexity, while the multiphase modulation technique reduces the out-of-band emissions. An 836.5-MHz four-phase prototype transmitter using four class-C power amplifiers in parallel was constructed. Using the transmitter, single-phase, two-phase, and four-phase pulsewidth modulated signals were tested to verify the benefits of using the proposed multiphase architecture. Using a CDMA2000 1X signal, 46.8% efficiency at a 29-dBm output power level was measured while passing the spectral-mask requirements without using any kind of digital predistortion or calibration.
Keyword:
Modulators
power amplifiers (PAs)
pulsewidth modulation (PWM)
radio transmitters
期刊
IF:
5.2
论文数:
9.8K
被引数:
2.2W
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