Highly Efficient Envelope-Tracking Modulator Over Wide Output Power Range for Dual-Mode Power Amplifier
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초록
This paper presents a highly efficient envelope-tracking (ET) modulator over wide output power range. The ET modulator is designed to operate with a dual-mode power amplifier (PA). The supply voltage of the linear regulator is adjusted according to the average power level for further enhanced efficiency at a low power region. An adaptive bias circuit is designed to avoid the crossover distortion generated by the adjusted supply voltage. For a 10-MHz long term evolution signal with a peak-to-average power ratio of 7.44 dB, the ET modulator delivers measured efficiencies of 76.9% and 62.5% at the maximum output power and 10-dB back-off power, respectively. The measured efficiency at the 10-dB back-off power is enhanced by 10% point, while maintaining the peak efficiency.
Abstract
This paper presents a highly efficient envelope-tracking (ET) modulator over wide output power range. The ET modulator is designed to operate with a dual-mode power amplifier (PA). The supply voltage of the linear regulator is adjusted according to the average power level for further enhanced efficiency at a low power region. An adaptive bias circuit is designed to avoid the crossover distortion generated by the adjusted supply voltage. For a 10-MHz long term evolution signal with a peak-to-average power ratio of 7.44 dB, the ET modulator delivers measured efficiencies of 76.9% and 62.5% at the maximum output power and 10-dB back-off power, respectively. The measured efficiency at the 10-dB back-off power is enhanced by 10% point, while maintaining the peak efficiency.
참고문헌 (15)
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