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A Class-G Switched-Capacitor RF Power Ampli fier Sang-Min Y oo, Member , IEEE, Jeffrey S. Walling , Senior Member , IEEE,O fir Degani, Member , IEEE
提出一种采用新型耐压开关的Class-G开关电容射频功率放大器，实现高效高线性输出。
65nm CMOS, 峰值输出功率24.3dBm, PAE 43.5%, 64-QAM OFDM平均PAE 33%, EVM 2.9%
开关电容功率放大器Class-G射频DAC包络消除与恢复极性发射机
▸采用新型耐压开关实现双电源供电
▸开关电容射频DAC实现包络数模转换
▸无需数字预失真即实现高线性
Abstract
A switched-capacitor power ampli fier (SCPA) that realizes an envelope eliminatio n and restoration/polar class-G topology is introduced. A novel vol tage-tolerant switch enables the use of two power supply voltages which increases ef ficiency and output power simultaneously. Enve lope digital-to-analog conver- sion in the polar transmitter is achieved using an SC RF DAC that exhibits high ef ficiency at typical output power backoff levels. In addition, high linearity is achiev ed and no digital predistortion is required. Implemented in 65 nm CMOS, the measured peak output power and power-added ef ficiency (PAE) are 24.3 dBm and 43.5%, respectively, whereas when amplifying 802.11g 64-QAM OFDM signals, the average output power and PAE are 16.8 dBm and 33%, respectively. The measured EVM is 2.9%.