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2、使用运算放大器
如图2-1所示，运算放大器具有高增益。增益取决于频率。增益也因器件而异，并受温度和其它环境条件的影响。因此，运算放大器通常与负反馈一起使用。根据条件，负反馈变为正反馈，导致反馈回路异常振荡。
第2节介绍了在考虑放大器电路时必需的反馈振荡、使用运算放大器的基本放大器电路、虚拟短路。
- 反馈（正反馈和负反馈）
- 开环增益和闭环增益
- 振荡
- 基本放大器电路
- 虚拟短路（虚拟接地）
- 1/6
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