Hello everyone!
I currently trying to solve problem 2.6.C from Razavi's "Design of analog CMOS IC". (Circuit attached to post) The goal is to plot current Ix (drain current), while Vx changes from 0 to 3V.
Due to the current source, problem gets too hard for me and I look in to the solutions. Author of its gets that while Vx changes, voltage at the positive port of CS equal to 0, but I think thats is wrong, because if so when Vx = 0, current don't flow at all. So CS need to make voltage at the positive port so negative that voltage drop across the resistor R1 and the MOS M1 gives the I1 current. When Vx grows up, voltage at the positive port also changes in any direction, but not stays in initial state or 0.
So. Maybe I wrong with this and dont understande how CS works?
I currently trying to solve problem 2.6.C from Razavi's "Design of analog CMOS IC". (Circuit attached to post) The goal is to plot current Ix (drain current), while Vx changes from 0 to 3V.
Due to the current source, problem gets too hard for me and I look in to the solutions. Author of its gets that while Vx changes, voltage at the positive port of CS equal to 0, but I think thats is wrong, because if so when Vx = 0, current don't flow at all. So CS need to make voltage at the positive port so negative that voltage drop across the resistor R1 and the MOS M1 gives the I1 current. When Vx grows up, voltage at the positive port also changes in any direction, but not stays in initial state or 0.
So. Maybe I wrong with this and dont understande how CS works?
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