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About information presented in this cross reference

The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.

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什么是运算放大器的开环增益和闭环增益?

图1:运算放大器的波特图
图1:运算放大器的波特图

运算放大器具有高增益(约105或100dB)。为实现稳定运行,运算放大器与负反馈一起用。无反馈的运算放大器的增益称为开环增益,而带有反馈电路的运算放大器的增益则称为闭环增益。图1显示了运算放大器的波特图,表明了开环增益与闭环增益之间的关系。当频率翻倍时,开环增益减半。(在对数刻度上,其斜率为-6dB/oct或-20dB/dec。)
图2所示的负反馈电路的闭环增益(Gv)的计算结果为-R2/R1

图2:负反馈电路示例(反相放大器)
图2:负反馈电路示例(反相放大器)
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