【摘要】 提出了一种新颖的宽范围CMOS可变增益放大器结构.利用可变跨导和新颖的可变输出电阻,基于单独可变增益级的放大器可提供80dB的宽范围调节.同时控制电路的设计完成了温度补偿及dB线性增益特性,实现在整个温度及增益调节范围内绝对增益误差小于±1.5dB.基于0.25μmCMOS工艺验证表明,放大器可提供64.5dB的增益变化范围,其中dB线性范围为55.6dB.输入1dB压缩点为-17.5到11.5dBm,3dB带宽为65MHz到860MHz,2.5V电源供电下功耗为16.5mW.更多还原

【Abstract】 A novel wide-range CMOS variable gain amplifier(VGA)topology is presented.The proposed VGA is composed of a variable transconductor and a novel variable output resistor and can offer a high gain variation range of 80dB while using a single variable-gain stage.Temperature-compensation and decibel-linear gain characteristic are achieved by using a control circuit that provides a gain error lower than ±1.5dB over the full temperature and gain ranges.Realized in 0.25μm CMOS technology,a prototype of the proposed VGA provides a total gain range of 64.5dB with 55.6dB-linear range,a P-1dB varying from-17.5 to 11.5dBm,and a 3dB-bandwith varying from 65 to 860MHz while dissipating 16.5mW from a 2.5V supply voltage.更多还原