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本文提出了一种工作于2-4.3GHz的宽带数字功率放大器（DPA），通过内置的AM-PM失真自补偿技术，解决了数字功率单元操作引起的严重AM-PM失真问题，实现了24dBm输出功率和高线性度。
spectrum-efficient modulation schemes such as 64QAM and 256QAM and high data-rates. This poses stringent requirements on RF Power Amplifiers (PAs) for their carrier bandwidth, linearity, modulation rate, and efficiency. Several multiband Analog PAs (APAs) and Digital PAs (DPAs) are recently reported. However, multiband APAs often suffer from low power efficiency [1]. Although current-mode DPAs achieve high efficiency, high output power (Pout), and compact designs [2], they typically exhibit excessive AM-PM distortions intrinsically due to the digital power cell operations. Thus, current-mode DPAs often need frequency-dependent AMPM look-up-tables for pre-distortion and/or real-time phase cancellation, resulting in additional overhead and difficult implementation for high modulation rates [3,4].
Jongseok Park1, Yanjie Wang2, Stefano Pellerano2, Christopher Hull2, Hua Wang1
Georgia Institute of Technology, Atlanta, GA Intel, Hillsboro, OR 1 2 Modern wireless systems often support multi-standards with