R2和R4用来降低因输入失调电流产生的误差，其原理与前文光电二极管放大器所述一致。
R2 and R4 are chosen to minimize errors due to input offset current as outlined in the section describing the photocell amplifier.
通过讨论输入失调电流对集成运算放大器输出的影响，推导出集成运算放大器外围阻抗的最佳取值关系。
After discussing how the input offset current influences the output of operational amplifier, the optimal relationship between peripheral impedance is obtained.
输入失调电流是两个差动输入端的基极输入电流，当两个输入端的源阻抗不相等时，它可引起仪表放大器的失调误差。
Input offset current is the difference between the two input bias currents and this leads to offset errors in in-amps when source resistances in the two input terminals are unequal.
低失调、低噪声、极低的输入偏置电流和高速度特性相结合，使这些放大器适合各种应用。
The combination of low offsets, low noise, very low input bias currents, and high speed make these amplifiers useful in a wide variety of applications.
低失调、低噪声、极低的输入偏置电流和高速度特性相结合，使这些放大器适合各种应用。
The combination of low offsets, low noise, very low input bias currents, and high speed make these amplifiers useful in a wide variety of applications.
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