标题： AD820单通道电路的重新设计用于aRD820低噪声轨到轨运算放大器的开发 显示英文标题

标题： Redesign of the AD820 Single-Channel Circuit for the Development of the aRD820 Low-Noise Rail-to-Rail Operational Amplifier

摘要： 这项工作的任务是设计并随后生产一款低功耗（单电源5-30 V，双电源±2.5 V和±15 V）的轨到轨运算放大器aRD820，具有低电压噪声（<4 μV，峰峰值0.1至10 Hz），超低输入偏置电流（< 15 pA）和低失调电压（< 500 μV）特性。 Analog Devices芯片AD820也具有类似的特性。 因此，设计团队的任务是将AD820的原型电路适应我们的技术能力，如有必要，对电路进行修改以消除原型的任何缺陷。 运算放大器输入级模块在输入端采用了源极跟随器。 第二级模块被修改为更对称。 输出级模块增加了额外的电阻器和电容器以实现频率补偿。 电流参考模块中的一个FET晶体管被其他元件替代。 AR820和aRD820这些模块的简化电气图已给出。 对模块的修改后电气图在Simulink软件中进行了测试。 对aRD820完整电气图的仿真表明，它表现出与AD820数据表中相似的特性。 随后的aRD820芯片生产和测量表明，运算放大器的计划特性得到了满足。 显示英文摘要

摘要： The task of this work was to design and later produce a low-power (single supply 5 - 30 V, dual supply +-2.5 V and +-15 V) rail-to-rail operational amplifier aRD820 with low voltage noise (<4 uV, p-p. 0.1 to 10 Hz), ultralow input bias current (< 15 pA), and low offset voltage (< 500 uV) characteristics. Similar characteristics are presented by Analog Devices chip AD820. Thus, the task of the design team was to adapt the prototype circuity of AD820 to our technological capabilities, modify the circuit, if necessary, to eliminate any deficiency of the prototype. The input stage module got source followers at the input of the operational amplifier. Second stage module was modified to be more symmetric. The output stage module obtained additional resistors and capacitors to achieve a frequency compensation. One FET transistor in the current reference module was substituted by other elements. Simplified electric schemes of these modules of AR820 and aRD820 are presented. The performance of modified electric schemes of modules was tested in Simulink software. Simulations of the full electric scheme for aRD820 were made and showed that it demonstrates similar characteristics as AD820 data tables. Later production of the aRD820 chip and measurements demonstrated that the planned characteristics of the operational amplifier were met.