| 运算放大器极点频率的一种估测方法 |
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| 引用本文： | 李舒晨.运算放大器极点频率的一种估测方法[J].渭南师范学院学报,2001,16(5):40-41. |
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| 作者姓名： | 李舒晨 |
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| 作者单位： | 渭南师范学院,物理系,陕西,渭南,714000 |
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| 摘 要： | 用滞后的一阶阻容网络与运放构成负反馈闭环连接时，若电路中使用的运算放大器在零分贝增益以上频段存在第二极点频率，则电路可能产生自激振荡，自激振荡的频率与运放的第二极点频率及反馈网络参数三者之间有内在关系，基于这种关系，可以根据电路的振频和反馈环节电路参数估求运算放大器的第二极点频率。
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| 关 键 词： | 运算放大器 交流特性 极点频率 零分贝增益 自激振荡 反馈网络 频率估测 |
| 文章编号： | 1009-5128(2001)05-0040-02 |
| 修稿时间： | 2001年2月21日 |
Estimating the polar frequency of operational amplifier |
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| LI Shu,chen.Estimating the polar frequency of operational amplifier[J].Journal of Weinan Teachers College,2001,16(5):40-41. |
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| Authors: | LI Shu chen |
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| Abstract: | For a negative feedback closed loop which is constructed by an operational amplifier and a delayed first-order capacitance and resistance network, when the amplifier has another polar frequency higher than 0dB, there may be certain self-oscillation in the circuit. The self-oscillation frequency keeps some inherent quantitative relation with the second polar frequency of the operational amplifier. The second polar frequency of the operational amplifier can be estimated from the self-oscillation frequency and the feedback network parameters according to such relation. |
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| Keywords: | operational amplifier AC character polar frequency |
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