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hi,guys,please help me!
Recently i have read a paper about gain-boosted operational amplifier.
It said" A general criterion for preventing the common-mode
feedback loop from slowing down the amplifier is that the loop unity-gain bandwidth should be at least 50% of the main amplifier loop...
thanks,erikl,gm=Id/(Vgs-Vth),if i want to get bigger value of gm/Id,i should make Vgs-Vth smaller,but i am afraid i can not get the correct simualtion result as the mosfet operates in the transition region,the bsim3 has not an accurate model for that mosfet.what should i do?
thanks erikl,but if in order to operate a mosfet in saturation,is it necessary to make Vgs-Vth>3*VT?I mean that in short channel ,the Vdsat is not equal to Vgs-Vth,if i want to ensure the mosfet operate in saturation,i should make Vdsat or Vgs-vth>3*VT?
1.because the rout is about gm*ro1*ro2,the equivalent input noise current is too small
2.can not follow u
3.the same as the calculation of OP
4.for high frenquency,wo should consider those capacitor,because the fluctuation of the source can effect the circuit through those capacitors...
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