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该论文提出了一种全集成CMOS开关功率混频器阵列，能够在倍频程带宽内实现瓦特级功率输出，用于改善功率放大器的线性度和回退效率。通过分离幅度和相位信息，避免了传统线性PA的低效率问题。
Non-constant envelope modulation schemes have become commonplace in cellular applications due to their higher spectral efficiency. Linear PAs driven by an RF transmitter are usually used to generate these signals faithfully at the expense of power efficiency. Separate processing of amplitude and phase information (e.g., EER or polar modulation) has been proposed [1] as a way of improving the system power efficiency. However, many of these schemes require an efficient high-power low-frequency supply modulator to reconstruct the amplitude information. This can be done, for instance, using a switching DC-to-DC converter with its own limitations in efficiency, bandwidth, and area that also requires an external inductor [2]. Even for an ideal supply modulator, the amplitude dynamic range of the PA itself is limited by the gate-to-drain feedthrough and its associated AM-to-AM and AM-to-PM conversion. (For example, in [3] a 10dB
Shouhei Kousai1, 2, Ali Hajimiri1
California Institute of Technology, Pasadena, CA, 2Toshiba, Kawasaki, Japan