基于斩波稳定技术的可编程增益放大器  

Programmable Gain Amplifier Based on Chopper Stabilization Technique

作　　者：陈泽锴 卢宏斌 汪家奇[1] 申人升[1] CHEN Zekai;LU Hongbin;WANG Jiaqi;SHEN Rensheng(School of Integrated Circuits,Dalian University of Technology,Dalian 116000,China)

机构地区：[1]大连理工大学集成电路学院,大连116000

出　　处：《微处理机》2024年第5期7-12,共6页Microprocessors

基　　金：2022年工业与信息化部产业再造与高质量发展专项(TC220A04A-49);国家重点研发计划项目“高能效感算一体芯片与系统”(2023YFB4503003)。

摘　　要：为满足模拟前端检测电路的低噪声、低失调的要求,介绍一种采用0.18μm CMOS工艺制作的基于斩波稳定技术的可编程增益放大器。采用斩波稳定技术降低失调与低频1/f噪声,利用可编程增益级提高模拟前端电路输出摆幅的利用率,以满足不同环境下的检测需求。该款放大器从1 Hz到10 kHz的等效输入噪声积分值为1.43μV,使用阻抗增强电路实现4.52 GΩ的运放输入阻抗;采用C-2C电容阵列作为可变电容阵列,可实现0~15倍最小步长1/64倍的增益调节,对于需要精细化调节增益的低噪声电路有广泛的应用场景。To meet the low-noise and low-offset requirements of analog front-end detection circuits,a programmable gain amplifier based on chopper stabilization technique fabricated using 0.18μm CMOS process is introduced.The chopper stabilization technique is employed to reduce offset and low-frequency 1/f noise,while the programmable gain stage is used to improve the utilization of the analog front-end cir-cuit's output swing,meeting detection needs in various environments.The amplifier's equivalent input noise integral value from 1 Hz to 10 kHz is 1.43μV,and it achieves an op-amp input impedance of 4.52 GΩusing an impedance enhancement circuit.A C-2C capacitor array is adopted as a variable capacitor array,enabling gain adjustment from 0 to 15 times with a minimum step of 1/64,which has wide application scenarios for low-noise circuits requiring fine-tuned gain adjustment.

关 键 词：斩波稳定技术 可编程增益放大器 阻抗增强电路 

分 类 号：TN402[电子电信—微电子学与固体电子学]