【摘要】 采用Cree公司的GaN晶体管CGH40010,设计了一个工作在2.12GHz,用于WCDMA的带有数字预失真的高效率F类功率放大器,以实现其高效率和高线性度.经过连续波信号测试,设计完成的F类功率放大器实现了75.2%的功率附加效率和39.4dBm的最大输出功率.对峰均比为7.1dB、带宽为20MHz的4载波WCDMA信号,经过数字预失真线性化技术后,F类功放在33.3dBm的平均输出功率下,输出信号的邻信道功率比分别由-28.3和-27.5dBc降低到-51.9和-54.0dBc.功放的漏极效率达到37.8%.所设计的功率放大器可用于WCDMA系统中.更多还原

【Abstract】 A digital predistorted class-F power amplifier (PA) using Cree GaN HEMT CGH40010 operating at 2.12 GHz is presented to obtain high efficiency and excellent linearity for wideband code-division multiple access (WCDMA) applications. Measurement results with the continuous wave (CW) signals indicate that the designed class-F PA achieves a peak power-added efficiency (PAE) of 75.2% with an output power of 39.4 dBm. The adjacent channel power ratio (ACPR) of the designed PA after digital predistortion (DPD) decreases from -28.3 and -27.5 dBc to -51.9 and -54.0 dBc, respectively, for a 4-carrier 20 MHz WCDMA signal with 7.1 dB peak to average power ratio (PAPR). The drain efficiency (DE) of the PA is 37.8% at an average output power of 33.3 dBm. The designed power amplifier can be applied in the WCDMA system.更多还原