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Use ADCMP602 to detecte Peak arrival time of lightning

Question asked by sunchris on May 14, 2015
Latest reply on May 22, 2015 by krisf

Dears,

 

I want to design a module to detecte Thunderstruck voltage.

I use a amplifier(TL084) formed a voltage follower, when the thunder came, the out put of the voltage follower has a little delay than the input voltage. During the periods of rising edge output voltage will a little lower than input. During the periods of falling edge output voltage will a little higher than input.

 

I plan connect the input and output of TL084 to ADCMP602 VP(2) and VN (3) , as bellow figure.IN+ is signal input.

QQ图片20150514155830.png
But I find the output of ADCMP602 Q (pin 7) is unstable, when VP and VN voltage is very close. As follow figure.

ADCMP602_Figure2.jpg

I want know the reason of caused plush spike, and dose it suite for this application?

 

I also use opa615 to pick up the Peak voltage, do you have some advice part to replace it?

 

thank you.

 

BR

 

Chris

 

消息编辑者为:Chris Sun

 

消息编辑者为:Chris Sun

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