← 返回 JSSC 论文列表JSSC 2012第7期Other90nmPower Amplifier
Transformer-Based Uneven Doherty Power Ampli fier in 90 nm CMOS for WLAN Applications Ercan Kaymaksut,S t u d e n tM e m b e r ,I E E E
本文提出了一种基于变压器的非对称多赫蒂功率放大器，用于WLAN应用，显著提高了回退效率。
26.3 dBm最大输出功率，33%峰值PAE，25.1% 6dB回退PAE
功率放大器多赫蒂变压器WLANCMOS
▸创新点1：基于变压器的非对称多赫蒂架构（电路创新）。采用新型非对称串联组合变压器实现非对称多赫蒂操作，显著提高了功率放大器的回退效率（PAE在6dB回退时仍高达25.1%），同时避免了线性度下降。
▸创新点2：无需预失真即可满足WLAN要求（系统创新）。在54Mbps WLAN 802.11g信号测试中，该功放在19.3dBm平均输出功率下满足严格的EVM和频谱掩模要求，PAE达到22.9%，无需任何预失真处理。
▸创新点3：开环数字预失真进一步改善线性度（方法创新）。通过应用开环数字预失真技术，功放在20.2dBm平均输出功率下仍能满足WLAN要求，PAE提升至24.7%，展示了线性度与效率的协同优化。
▸创新点4：全集成90nm CMOS工艺实现（工艺创新）。该设计在标准90nm CMOS工艺中实现了完全集成的变压器多赫蒂功放，最大输出功率26.3dBm，峰值PAE达33%（2V供电），展现了CMOS工艺在高频功放中的潜力。
Abstract
This paper presents a fu lly integrated trans - former-based Doherty power amplifie ri nas t a n d a r d9 0n mC M O S process. A novel asymmetrical series combining transformer is used to achieve uneven Doherty operation. The t ransformer-based uneven Doherty architecture is analyzed to further improve the back-off ef ficiency without linearity degradation. The fabricated two-stage uneven Doherty PA achieves a maxi mum output power of 26.3 dBm at 2.4 GHz with a peak power added ef ficiency (PAE) of 33% at 2 V supply voltage. The PAE at 6 dB back-off is still as high as 25.1%. The PA is tested with 54 Mb ps WLAN 802.11g signal and it meets the stringent EVM and spectral mask require- ments at 19.3 dBm average output power with a PAE of 22.9% with no need of predistortion. An op en loop digital predistortion is applied to further improve the linearity. The PA satis fies WLAN requirements at 20.2 dBm average output power with a PAE of 24.7% with predistortion.