我用2277做了一个增益为1的反向放大器,具体见附件!
问题是,现在运放的后端电路大概有200多nF的电容,导致运放震荡,峰峰值达800mV,震荡频率为3.2MHz左右;图中的C455就是用来补偿相位的,但具体怎么算这个电容值,我不是很清楚,尝试了多个容值,仍然震荡的很厉害!请高手帮忙分析下怎么计算这个电容的容值以及这个问题的解决方法!!多谢!!
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