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运算放大器的等效输入噪声电压可以表示为:V_1=[V_1~2·(A_1/A)~2+……+V_n~2(A_n/A)~2]~(1/2)运算放大器的低噪声设计原则是找出主要噪声源,减小主要噪声源的数量,并减少每个噪声源的噪声贡献.可以用SPICE—Ⅲ程序进行噪声模拟,但是MOSFET的1/f噪声公式要被修正或者适当池选择AF和KF.当AF=2,KF=3 E-24时,可以得到最小的模拟误差.模拟数据和测量数据都给出作为比较.
The equivalent input noise voltage of the op amp can be expressed as: V_1 ~ 2 · (A_1 / A) ~ 2 + · + V_n ~ 2 (A_n / A) ~ 2] ~ (1/2) The principle of low noise design is to identify the main noise sources, reduce the number of primary noise sources, and reduce the noise contribution of each noise source. The SPICE-III program can be used to perform noise simulations, but the MOSFET 1 / f noise equation is to be corrected Or the appropriate pool for AF and KF, the smallest simulated error is obtained when AF = 2 and KF = 3 E-24. Both the simulated data and the measured data are given as a comparison.