摘要
针对功率回退时主路功率放大器不能有效进入饱和状态导致Doherty功率放大器回退效率低的问题,通过降低主路功率放大器的供电电压,实现了高回退效率,同时增大辅路功放管的尺寸弥补了电路的总输出功率。基于0. 1μm GaAs pHMET工艺,设计了一个26 GHz两级非对称的Doherty功率放大器。仿真结果表明,在26 GHz时增益达到16 dB,功放的饱和输出功率为27. 4 dBm,峰值功率附加效率(PAE)为40. 7%,输出功率回退7 dB时PAE仍达到38%,与传统Doherty功率放大器相比具有更高的回退效率,版图的尺寸为3. 2 mm×2. 2 mm。
Aiming to the low efficiency of Doherty power amplifier at back-off operation,this paper proposed a new method to achieve high back-off efficiency by reducing the power supply voltage of the main power amplifier. Furthermore,the size of the auxiliary power amplifier tube was increased in order to compensate the total output power. A 26 GHz two-stage asymmetrical Doherty power amplifier was designed with 0. 1 μm gallium arsenide( GaAs) pseudomorphic high electron mobility transistor( pHMET) process. The simulation results demonstrate that at 26 GHz,the power amplifier achieves small signal gain of 16 dB,saturation output power of 27. 4 dBm,peak power added efficiency( PAE) of 40. 7% and 7 dB back-off PAE of 38%,which has higher back-off efficiency than that of traditional Doherty power amplifiers. The chip size is 3. 2 mm×2. 2 mm.
作者
张博
郭强
吴昊谦
ZHANG Bo;GUO Qiang;WU Haoqian(School of Electronic Engineering,Xian University of Posts and Telecommunications,Xian 710121,China)
出处
《电子元件与材料》
CAS
CSCD
北大核心
2020年第1期74-79,共6页
Electronic Components And Materials
基金
陕西省重点研发计划项目(2017ZDXM-GY-004,2018ZDXM-GY-010)
西安市集成电路重大专项(201809174CY3JC16)
