基于负反馈技术的嵌套式直流失调消除电路  

A nested DC offset cancellation circuit based on negative feedback technique

作　　者：张芳玲 雷倩倩[1] 张旭东 李弦 李连碧[1] Zhang Fangling;Lei Qianqian;Zhang Xudong;Li Xian;LI Lianbi(School of Science,Xi'an Polytechnic University,Xi'an 710000,China;Shenzhen Niureixin Technology Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]西安工程大学理学院,陕西西安710000 [2]深圳市纽瑞芯科技有限公司,广东深圳518000

出　　处：《电子技术应用》2021年第5期50-53,58,共5页Application of Electronic Technique

基　　金：深圳市科技计划(KQTD20190929172628244)。

摘　　要：基于UMC 40 nm CMOS工艺,设计了一种带有直流失调消除电路(DCOC)的可编程增益放大器(PGA),该PGA采用闭环电阻反馈结构,由两级增益单元级联构成。DCOC电路基于传统的直流负反馈结构,针对多级级联的方式,提出了一种嵌套式反馈方法,可降低电路功耗和面积。仿真结果表明,DCOC在0-52dB的增益变化范围内高通截止频率恒为10 kHz,相对抑制度恒为50 dB,且在0dB时可矫正的最大输入失调量为110mV。与传统设计方法相比,DCOC的面积减小近一半。Based on the UMC 40 nm CMOS process,a programmable gain amplifier(PGA)with DC offset cancellation circuit(DCOC)is designed.The PGA adopts a closed-loop resistance negative feedback structure and consists of a cascade of two gain units.DCOC circuit is based on the traditional DC negative feedback structure,a nested feedback method is proposed to reduce the power consumption and area of DCOC circuit.The simulation results show that within the gain variation control range of 0~52 dB,the high pass cutoff frequency and the relative inhibition degree of DCOC are constant at 10 kHz and 50 dB,and the maximum correctable input misalignment at 0 dB is 110 mV.Compared with the traditional design method,the area of DCOC has been reduced by almost half.

关 键 词：直流失调消除 嵌套式反馈 可编程增益放大器 

分 类 号：TN722[电子电信—电路与系统]