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该论文提出了一种工作在2.2GHz、输出功率超过1W的开关电容数字功率放大器，通过宽带宽混合域多抽头FIR滤波技术有效抑制带外噪声，解决了数字发射机中带外发射问题。
Digital power amplifiers and transmitters have drawn significant interest in the recent past due to their reconfigurability, compatibility with CMOS technology scaling and DSP, and potential for automated design synthesis [1-5]. While significant progress has been made in achieving moderate output power levels in CMOS, wideband modulation, and high efficiency under back-off, out-of-band emissions remain an unsolved problem. The elimination of the analog reconstruction filter that follows the DAC in a conventional analog transmitter implies that broadband DAC quantization noise appears at the output of the transmitter unfiltered. Quantization noise can be suppressed by increasing resolution and/or sampling rate, but to meet the challenging -150 to -160dBc/Hz out-of-band (OOB and specifically RX-band) noise requirement of FDD with conventional duplexers, nearly 12b at 0.5GS/s is required. Such a high effective
Ritesh Bhat, Jin Zhou, Harish Krishnaswamy
Columbia University, New York, NY