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RE: OPA2210: 峰值检测电路

Hello. I don't quite understand why the initial value of the simulation starts to decrease from 13.5V. Could you please help me explain it? Thank you.

  • 你好,信号刚给入瞬间,在反馈建立之前,运放工作在开关状态,会输出电源电压,这个电压会给后级电容充电到电源电压,电路检测到这个峰值。当第一级反馈建立后,由于二极管单向导通,第一级输出小于二极管后的第二级输入(电容电压),等待电容电压与电阻放电完成后才会跟踪正常工作,如过需要尽可能短完成这个过程,可以在电容放电回路放置开关,让放电迅速完成。