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Differential amplifier (maybe slewing issue)

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angbong

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Hi i'm designing differential pair with active load.

Yellow curve is pulse input of differential amplifier.

Blue curve is output at drain of M49.

As you can see in the blue curve, rising edge is very fast but falling edge is quiet weird.

at first voltage falls slowly and then falls exponentially.

if that's because of slew rate, slope of the falling edge must be larger then the part of the exponentially falling.

why is this happen?

Diff.JPG
 

Did you put a capacitive load at the output, or is it floating?

BR Jerry
 

This is because pulse input is not perfect square and mosfet is still open untill voltage drops under gate treshold.
 

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