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[SOLVED] Relationship between Slew Rate and GBW

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petelee

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I encountered this equation in CMOS conventional 2-stage opamp theory.

Slew rate = (VGS-VTH)*WT

VGS-VTH is bias condition on input transistors. And WT is Gain-bandwidth product.

I'd like to know how to get the equation and understand the reasoning on it. Any paper or article about it would be really appreciated. I'm really curious. :)
 

Assuming a two stage miller compensated opamp, slew rate is given by I/Cc, where I is the tail current source of first stage, Cc is the miller cap. Also gm=I/(Vgs-Vth) . Slo slew rate= gm*(Vgs-Vth)/Cc. gm/Cc is the unity gain frequency (Gain -BW product).
 
Dear Monsoon,

I appreciate your reply. Now I clearly understand it. This eda board really helps whenever I have a technical question. :-o
 

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