题目/Title：低功耗、高线性CMOS可编程放大器
                        Low power, high linearity CMOS programmable gain amplifier

作者/Author：王自强,池保勇,王志华
                        Ziqiang Wang,Baoyong Chi,Zhihua Wang

期刊/Journal：清华大学学报（自然科学版） Journal of Tsinghua University (Science and Technology)

年份/Issue Date：2006.Apr.

卷（期）及页码/Volume（No.）&pages：Vol.46, No.4, pp. 519 - 522

摘要/Abstract：
针对接收机前端中可变增益放大器需要高线性处理大信号的问题,分析了使用源极退化电阻以及跨导增强电路的放大器线性度;设计了使用改进型跨导增强电路的放大器。它具有更强的跨导增强能力,同时减小了输入M O S管跨导由于漏源电压变化产生的非线性失真。提出了一种对称的可变电阻结构,它降低了M O S管开关带来的非线性。仿真结果表明,放大器在3.3V电源电压下直流功耗为1.5mW,在1~10MH z带宽、3~24 dB增益范围内,差分输出信号峰峰值为3.3V时,总谐波失真低于-60 dB。
Variable gain amplifiers (VGA) used in the front ends of receivers need to amplify large signals with high linearity. An amplifier was designed with an improved gm-boost circuit and increased transconductance of the input metal oxide semiconductor (MOS) transistor which reduces the distort ion caused by the drain-source voltage variation. A symmetrical variable resistor structure was used to further reduce the non-linearity from the MOS switch. Simulation results show that the amplifier consumes 1.5mW at 3.3V. The total harmonic distort ion of a 3.3V differential output signal is less than - 60 dB f or frequencies from 1 to 10MHzan d volt age gains from 3 to 24dB.