0.18μm CMOS可编程增益放大器

0.18 μm CMOS Programmable Gain Amplifier

介绍了一种基于0.18μm CMOS工艺,应用于5 GHz无线局域网(WLAN)的可编程增益放大器(PGA)。该PGA采用分级可选放大器的系统结构,核心电路由交叉耦合的共源共栅放大器和电流反馈放大器组成。为消除工艺角偏差对增益精度的影响,设计中加入了增益微调的机制。后仿真结果表明:PGA电压增益可在0 dB到41 dB之间以1 dB步长变化,双端输出的电压摆幅为1 Vp-p,并具有大于10 MHz的-3 dB带宽和小于21.1 mW的静态功耗。

A programmable gain amplifier（PGA） is designed in a 0. 18 um CMOS Technology, which is applied to a 5 GHz wireless LAN（WLAN） transceiver system. The PGA utilizes a multi-stage selectable amplifier system structure and comprises cross-coupled cascode and current feedback building blocks. To prevent the gain resolution of PGA being affected from the differences of process corners, a fine adjustment mechanism of its voltage gain is implemented. Post-layout simulation results exhibit that the PGA＇s voltage gain can be varied from 0 dB to 41 dB with 1 clB step, it has a full output swing of 1 Vpp, achieves a -3 dB bandwidth of 10 MHz, and consumes less than 21. 1 mW power from 1.8 V supply.