摘要
为解决信号处理延迟时间长、带容性负载能力差的问题,基于双极型工艺设计了一款高性能运算放大器。电路整体为二级运放,采用密勒电容来进行频率补偿。为保证运放工作在不同温度下的稳定性,采用一阶与温度无关的偏置电流。运放输入级采用共集-共射组态的形式,来增大运放的输入阻抗,同时提升对信号接收的灵敏度。电路采用全三极管来实现高增益和高转换速率,以及强带容性负载能力。为更好提升运算放大器的性能,采用spectre工具对电路进行仿真优化。仿真结果表明在±15 V电压工作条件下增益带宽积为4.57 MHz,压摆率为11.5 V/μs(负载电容100 pF),等效输入参考噪声为20 nV/Hz^(1/2),可驱动1000 pF负载电容。该设计具备高速数据采集与信号调理的能力。
A high-performance bipolar operational amplifier(op-amp)was designed to overcome limitations of conventional designs,specifically addressing excessive signal propagation delays and inadequate capacitive load drive capability.The architecture employed a two-stage topology with Miller compensation to ensure frequency stability,while incorporating a temperature-invariant bias current source to maintain consistent performance over operational temperature ranges.The input stage used a common-collector-common-emitter configuration to increase input impedance and signal sensitivity.Full-transistor implementation achieved high gain,high slew rate,and strong capacitive load driving capability.Circuit performance was optimized using Spectre simulation tools.Simulation results show a gain-bandwidth product of 4.57 MHz,a slew rate of 11.5 V/μs(under 100 pF load),an input-referred noise of 20 nV/Hz^(1/2),and a driving capability of 1000 pF at±15 V supply.The design supports high-speed data acquisition and signal conditioning.
作者
张东
肖永惠
曲美月
宫政
杨邦勋
ZHANG Dong;XIAO Yonghui;QU Meiyue;GONG Zheng;YANG Bangxun(School of Physics,Liaoning University,Shenyang 110036,China)
出处
《电子元件与材料》
北大核心
2025年第12期1459-1463,共5页
Electronic Components And Materials
基金
国家自然科学基金重大仪器专项(52427805)。
关键词
双极型晶体管
运算放大器
低噪声
高压摆率
bipolar junction transistor
operational amplifier(op-amp)
low noise
high slew rate
