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JSSC 2007第3期RF & Wireless0.13μmPower Amplifier

A 2.45-GHz 0.13- /22m CMOS PA With Parallel Amplification

一款采用并行放大技术的245GHz 0.13μm CMOS功率放大器,实现23dBm输出功率和35%的漏极效率。
23dBm输出功率, 1.5V电源电压, 35%漏极效率, 29%整体效率
CMOS功率放大器并行放大蓝牙LC balun高效率
创新点1:并行放大技术(方法创新) - 采用四个差分放大器并行工作,通过协同输出提升总功率效率,在1.5V供电下实现23dBm输出功率和35%的漏极效率,解决了单放大器在高频下的功率限制问题。
创新点2:片上LC balun结构输出组合(电路创新) - 创新性地集成LC balun结构实现多放大器输出信号的相位同步与阻抗匹配,降低传统外置balun的传输损耗,将整体效率提升至29%。
创新点3:低阻抗变换比设计(系统创新) - 通过优化每个独立放大器的阻抗变换比(<2:1),减少匹配网络损耗,同时支持输出功率动态调节,在功率回退时仍保持高效率特性。
创新点4:动态功率控制技术(方法创新) - 基于并行拓扑结构实现输出功率的精细调控,在输出功率降低时通过关闭部分放大器单元维持高效率,适应蓝牙设备不同工作模式需求。
Abstract
In this paper, a fully integrated 0.13- m CMOS RF power amplifier for Bluetooth is presented. Four differential am- plifiers are placed on a single chip and their outputs are combined with an on-chipLC balun structure. This technique allows to have a low impedance transformation ratio for each individual amplifier, and thus a lower power loss. The amplifier achieves a measured output power of 23 dBm at a supply voltage of 1.5 V and a drain efficiency of 35% and a global efficiency of 29%. The parallel am- plification topology allows to efficiently control the output power which results in an efficiency improvement when the output power is reduced.