一种带功率检测和自适应偏置的CDMA功率放大器  

A CDMA Power Amplifier with a Power Detector and an Adaptive Linear Bias Circuit

作　　者：梁聪[1,2] 滑育楠[1,2] 胡善文[1,2] 张晓东[3,4] 张海涛[3,4] 高怀[2] 

机构地区：[1]东南大学苏州研究院高频高功率器件与集成技术研究中心,江苏苏州215123 [2]东南大学国家ASIC系统工程技术研究中心,南京210096 [3]苏州工业园区教育投资发展有限公司 [4]苏州英诺迅科技有限公司射频功率器件及电路技术中心,江苏苏州215123

出　　处：《固体电子学研究与进展》2011年第1期81-84,89,共5页Research & Progress of SSE

摘　　要：设计了一款包含功率检测和自适应线性化偏置电路的CDMA功率放大器,功率检测器能根据输入信号的大小来调整功率管的偏置点,大幅提升低功率输出时的效率,从而提升系统整体效率;自适应线性化偏置能有效抑制功率放大器的增益压缩和相位失真,改善其线性度。采用2μm InGaP/GaAs HBT晶体管工艺成功流片,测试结果表明,与普通功率放大器相比较,当输出功率小于10 dBm时,新型功率放大器的集电极电流大幅降低,系统整体效率提高了2.2倍;1 dB增益压缩点由30 dBm增加到32 dBm;当输出功率为28 dBm时,ACPR和ALTR分别改善了5 dB和12 dB,IM3改善了11 dB。A CDMA power amplifier with a power detector and an adaptive linear circuit is designed.The power detector is used to adjust the bias point according to the input signal amplitude,which increases the efficiency when the output power is low and further more increases the system total efficiency.The adaptive linear circuit can efficiently improve the linearity by suppressing gain compression and phase distortion of the power amplifier.Measurement results of this novel amplifier fabricated based on 2 μm InGaP/GaAs HBT technology show that： the collector current is considerably reduced when the output power is less than 10 dBm and the system total efficiency reaches up to 2.2 times compared with the conventional amplifiers.The 1 dB compression point rises up from 30 dBm to 32 dBm.The ACPR,ALTR and IM3 are improved by 5 dB,12 dB and 11 dB respectively when the output power is 28 dBm.

关 键 词：功率检测 自适应偏置 效率 线性度 

分 类 号：TN722.75[电子电信—电路与系统]