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help!! about diff amp

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KianChang

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the circuit is as follow:

ib vdd y
m0 y y gnd gnd
m1 x y gnd gnd N
m2 vo- vi+ x gnd N
m3 vo+ vi- x gnd N
m4 vo- vb vdd vdd P
m5 vo+ vb vdd vdd P
r1 vo- vb
r2 vo+ vb
vdd vdd gnd
vi+ vi+ gnd
vi- vi- gnd

who can tell me what the special about this circuit? thx
 

Hi kiancheng!
Can u please send the cct diagram or the notation used in this netlist bcoz I am getting different kind of netlist in my spice tool.
For ex: Mos 1 2 3 4
1: Source
2:Drain
3:Gate
4:Bulk
pankaj
 

Hi
I'm not sure
but I think it uses kind of common mode feedback.
But I think it is very bad CMFB.
regards
 

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