question on Shaeffer's "A 1.5v, 1.5-GHz CMOS LNA"(
时间：04-10
整理：3721RD
点击：
how to get the equation (23)?
(Ig,c-Vgs×SCgs)×(SLg+Rs)-(Id+gm×Vgs+Vgs×SCgs-Ig,c)×SLs=Vgs
Iout=gm×Vgs+Id
so Iout=Id/(1+ωT×Ls/Rs)+Ig,c×ωT×(1/S+(Lg+Ls)/Rs)/(1+ωT×Ls/Rs)
and Ig,c=Id×j|c|×ωCgs×(δ/(5γ))?/gd0
(is it correct?)
so k=δα2×(QL)2×|c|2 / (5γ)+[1+|c|×(δα2/(5γ))?]2
It is different from equation (23), who can tell me what?s the problem ?
Thanks !
(Ig,c-Vgs×SCgs)×(SLg+Rs)-(Id+gm×Vgs+Vgs×SCgs-Ig,c)×SLs=Vgs
Iout=gm×Vgs+Id
so Iout=Id/(1+ωT×Ls/Rs)+Ig,c×ωT×(1/S+(Lg+Ls)/Rs)/(1+ωT×Ls/Rs)
and Ig,c=Id×j|c|×ωCgs×(δ/(5γ))?/gd0
(is it correct?)
so k=δα2×(QL)2×|c|2 / (5γ)+[1+|c|×(δα2/(5γ))?]2
It is different from equation (23), who can tell me what?s the problem ?
Thanks !
i don't kown