Alles Gute said:M3 can be deemed as a curent source.
Then M1-M2, M4-M7 form a negative feedback, stabilize the gate voltage of M1/M6
to be value which (ideally) ensure zero systematic offset.
But are you sure the mirror ratio for M2 and M4 is 1:2 not 1:1?
Alles Gute said:M3 can be deemed as a curent source.
Then M1-M2, M4-M7 form a negative feedback, stabilize the gate voltage of M1/M6
to be value which (ideally) ensure zero systematic offset.
But are you sure the mirror ratio for M2 and M4 is 1:2 not 1:1?
i don't think "ID6 increase -> ID7,ID5,ID2 increase -> ".Vg1 increase -> ID6 increase -> ID7,ID5,ID2 increase -> ID1 decrease ->Vg1 decrease
yes, it need compensation.marshel said:So this amp does not need any cap for compensation?
willyboy19 said:I don't think the purpose of M1~M5 has anything to do with systematic offset. This is a clever designed OPAMP with push-pull output stage. You should think of M1~M5 as level shifter block which provides another replica of amplified output voltage from the first stage to the PMOS driver M7. The operating principle is current-mode based and provides minimum phase shift, which of course, has little impact on the close loop stability of the overall Opamp.
Challenge me if you think it differently
fantaci said:I think maybe you are wrong. you should not disconneted those nods. because I think it is where the feedback happens. I guess the pbias is from some diode connected transisitor and this transistor is connected to some current source. So why not analize by including bias circuit. When you do so, you can deem pbias as a current source bias, not a voltage source bias.
just my guess
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