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oermens said:your question is beyond vague... what circuit in particular? opamp? lna? oscillator? SCL logic? what are your requirements and constraints? what process are you using? etc..
Blackuni said:Hi,
Id (M8 ) = Id(M9a) + Id(M9b)
so vbias = Vgs value which gives Id(M8 ) considering the effects of Vds8
Practically u can find this Vgs value by plotting V-I curve for M8
you can refer to any books on Analog CMOS design.
Hope this helps.
Thanks,