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运放参数的详细解释和分析
作者 Wayne Xu
http://www.deyisupport.com/question_answer/analog/amplifiers/f/52/t/2021
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目录
1、 输入偏置电流和输入失调电流 ........................................................................................... 2
2、 如何测量输入偏置电流 Ib，失调电流 Ios ......................................................................... 6
3、 输入失调电压 Vos 及温漂 ................................................................................................. 10
4、 运放噪声快速计算 ............................................................................................................. 14
5、 电源抑制比 DC-PSRR .......................................................................................................... 18
6、 电源抑制比 AC-PSRR .......................................................................................................... 19
7、 共模抑制比 CMRR .............................................................................................................. 22
8、 共模抑制比 CMRR 的影响 ................................................................................................. 25
9、 放大电路直流误差（DC error） ....................................................................................... 28
10、 放大电路直流误差（DC error）的影响因素 ............................................................... 29
11、 输入阻抗和输入电容 ..................................................................................................... 31
12、 输入电容 Cin 的测量 ...................................................................................................... 33
13、 轨至轨输入（rail to rail input） .................................................................................... 35
14、 轨至轨输入_TI 的领先技术 ........................................................................................... 38
15、 开环增益 Aol .................................................................................................................. 40
16、 增益带宽积（GBW）..................................................................................................... 43
17、 从开环增益曲线谈到运放稳定性 ................................................................................. 44
18、 压摆率(SR) ...................................................................................................................... 47
19、 全功率带宽(FPBW) ......................................................................................................... 50
20、 建立时间(Settling Time) ................................................................................................. 52
21、 总谐波失真(THD) ........................................................................................................... 53
22、 轨至轨(rail to rail)输出 ................................................................................................... 55
23、 输出短路电流 ................................................................................................................. 57
24、 输出阻抗 Ro 和 Rout ...................................................................................................... 58
25、 运放的热阻 ..................................................................................................................... 62
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