Apr 12, 2013 #1 A angbong Newbie level 6 Joined Oct 14, 2010 Messages 11 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,372 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?
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?
Apr 12, 2013 #2 H helpmejerry Member level 1 Joined Apr 22, 2011 Messages 39 Helped 12 Reputation 24 Reaction score 11 Trophy points 1,288 Activity points 1,482 Did you put a capacitive load at the output, or is it floating? BR Jerry
Apr 12, 2013 #3 G GUMY Full Member level 2 Joined Feb 11, 2013 Messages 120 Helped 26 Reputation 52 Reaction score 25 Trophy points 1,308 Location Slovenia Activity points 1,813 This is because pulse input is not perfect square and mosfet is still open untill voltage drops under gate treshold.
This is because pulse input is not perfect square and mosfet is still open untill voltage drops under gate treshold.
Apr 12, 2013 #4 A angbong Newbie level 6 Joined Oct 14, 2010 Messages 11 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 1,372 Output is floating