80mv could be enough for saturation, depending on the value of your Vds. However, most probably your transistor will be in weak inversion or just out of weak inversion into moderate inversion. 80mv is not good for matching, for distortion and frequency behavior. However, it provides good current efficiency since you get the maximum gm for the current you have through this transistor.
200mV is ok and it is ok if Vgs-Vth<200mV. Usually Vgs-Vth=200mV is for reasonalbe spedd and swing. For more details, visit EE240 course materials from berkeley. You can search them in edaboard.
200mV is ok and it is ok if Vgs-Vth<200mV. Usually Vgs-Vth=200mV is for reasonalbe spedd and swing. For more details, visit EE240 course materials from berkeley. You can search them in edaboard.
thanks! yes, it is also 200mV in Sansen's book Analog design essentials.
BTW: there is another parameter of Vdsat in Spectre, Shall we assure that Vds>Vdsat and Vds>Vgs-Vth.
Is Vdsat always less than Vgs-Vth in saturation?