viperpaki007
Full Member level 5

Hi,
I am making a supply independent bias circuit as shown in Razavi CMOS integrated circuit book (Figure 11.5). I simulated the circuit but it does not seem to work properly. See output current vs vdd supply curve attached with this email. Can some body help? Circuit has following W and L values:
MN0 W= 28u L=1.4u
MN2 W= 7u L=1.4u
MN3 W= 7u L=1.4u
MP1 W= 14u L=1.4u
MP2 W= 14u L=1.4u
Moreover, i really can't understand how the start up circuit consisting of MN3 works. Can somebody explain this as well.
regards
I am making a supply independent bias circuit as shown in Razavi CMOS integrated circuit book (Figure 11.5). I simulated the circuit but it does not seem to work properly. See output current vs vdd supply curve attached with this email. Can some body help? Circuit has following W and L values:
MN0 W= 28u L=1.4u
MN2 W= 7u L=1.4u
MN3 W= 7u L=1.4u
MP1 W= 14u L=1.4u
MP2 W= 14u L=1.4u


Moreover, i really can't understand how the start up circuit consisting of MN3 works. Can somebody explain this as well.
regards