Qi Yu, Wen Luo, N. Ning, Zhenya Sun, C. Wang, Yong Hu, Tianzhu Li
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引用次数: 3
摘要
提出了一种基于曲率匹配的CMOS db线性可变增益放大器(VGA)。CMOS db -线性VGA提供59dB的可变增益，同时保持大于86MHz的- 3dB带宽。提出了一种基于低失真源退化差分放大器结构的曲率匹配方法来获得db线性增益控制特性。分析了对dB线性度的非理想影响，并提出了改进方法。该VGA采用0.13μm CMOS工艺设计，后置仿真结果表明，该VGA具有良好的dB线性度、良好的总谐波失真性能和噪声系数。
A CMOS dB-linear variable amplifier using curvematching
A CMOS dB-linear Variable Gain Amplifier (VGA) using Curvematching is presented. The CMOS dB-linear VGA provides a variable gain of 59dB while maintaining −3dB bandwidth greater than 86MHz. Curvematching is proposed to obtain the dB-linear gain control characteristics based on a low-distortion source-degenerated differential amplifier structure. Nonideal effects on dB linearity are analyzed and the methods for improvement are suggested. The VGA is designed in a 0.13μm CMOS technology and the post-simulation results demonstrate the good dB linearity, good property of total harmonic distortion and noise figure.
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