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JSSC 2015第2期Other0.18µm

Cell-Based V ariable-Gain Amplifiers With Accurate dB-Linear Characteristic in 01

提出一种基于单元级联的dB线性可变增益放大器设计方法,实现高精度、低功耗和宽带宽。
0.18µm CMOS, 56dB增益范围, <0.3dB增益误差, 1.12mW功耗
可变增益放大器dB线性CMOS增益补偿单元级联
创新点1:单元级联设计方法 - 提出了一种基于单元级联的可扩展架构,通过模块化单元(cell)的灵活组合实现增益范围的可配置性(如5/10/15单元级联),在0.18 µm CMOS工艺下验证了38.6-56 dB的增益范围扩展能力,属于系统级创新。
创新点2:独特的增益补偿技术 - 采用新型dB线性补偿电路,在宽调谐范围内实现0.19 dB的超低增益误差,相比传统方法显著提升精度,属于电路级创新。
创新点3:可重构VGA/PGA双模工作 - 通过同一硬件架构支持模拟控制电压(VGA模式)和数字控制流(PGA模式),提供功耗(1.12 mW@最高增益)与性能的动态权衡,属于系统级创新。
创新点4:功耗-性能自适应优化 - 单元级联结构允许根据增益需求动态激活/关闭部分单元,在10-cell配置下实现38.6 dB增益范围时保持低功耗特性,属于方法创新与电路创新的结合。
Abstract
A simple and robust “cell-based” method is presented for the design of variable-gain a mplifiers (VGAs). The proposed unit cell utilizes a unique gain compensation method and achieves accurate dB-linear characteristic across a wide tuning range with low power consumption and wide bandwidth. Several such highly dB-linear unit cells can be cascaded to provide the required gain range for a VGA. To prove the concept, single-cell, 5-cell, 10-cell and 15-cell reconfigurable VGAs were fabricated in a sta