运算放大器电路的噪声分析和设计_何峥嵘.pdf

36 2 V ol1 36, l 2 2006 4 Micr oelectronics A pr1 2006 何峥嵘 ( , 400060) : 简要介绍了运算放大器电路包含的噪声类型运用标准的电路理论和噪声模型, 计算运 算放大器电路的噪声结 反相同相和差分输入的运算放大器电路分析举例, 讨论了推算运算放 大器电路噪声的方法最后, 给设计人员提供了有关噪声设计的建议和方法 : 运算放大器; 噪声; 谱密度; 均方值; 总的均方根噪声 : T N722 . 7+ 7 : A : 1004-3365( 2006) 02- 0148- 06 Noise Analysis and Design of Operational Amplifier Circuits H E Zheng- rong (Sichuan Institute of Solid-State Circuits, China Electronics Technology Group Corp oration, Chongqing 400060, P. R. China) Abstract: Di er ent no ise types in o per atio nal ampli ier ( op- amp) circuits are described . Standard circuit theo ry and no ise models are used to calculate no ises in op- amp cir cuits . W ith inv erting , noninverting and di er ential op- amp cir cuits as ex amples, methods to noise calculatio ns are illu st rated . Finally , use ul adv ices and techniques or no ise desig n ar e pr ov ided . Key words: O per at ional am pli ier ; Spectr al density; Av erag e mean- square v alue; T o tal roo t- mean- squar e no ise EEACC: 1220 , 1 引 言 , 2 运算放大器电路的噪声类型 , , 5 : p ( Shot No ise) , p ( T hermal Noise) , p ( F licker No ise) , p ( Bur st No ise) 1928 , J . B. Jo hn- p ( A v alanche Noise) son