Hi All,

I designed Beta Multiplier for pbias = 0.8 V and nbias = 0.4V at 1.0 V
supply for 90nm. While I get right values for the biases in dc
analysis, in transient anlaysis it gives different values. Could it be
that startup circuit is not working properly as the Vbiasp = 0.2V and
Vbiasn = 0.9 V in transient analysis ? If so, how should I go about
fixing it ? Also, I tried only multiplier circuit without any start up
circuit. Again I face the same problem. Or is it that pbias = 0.8 V
and nbias = 0.4V are not possible at 1.0 V ?

I will appreciate any help in this regard.

Regards,
Kanu

Hi Raja,

Thanks for your reply. I figured out that Beta Multiplier was not working properly at the first place. I was able to fix it. But I couldn't manage to design for Vbaisn = 0.4 and Vbiasp = 0.8 in the same circuit. So I decided to keep two bias circuits.

I have a question here again. Is there a way (like cascade structures or so.. which I can connect to Beta Multiplier's Vbaisn) to increase my Vbiasn from 0.2 to 0.4V. This will help me to do away with the second circuit.

Regards,
Kanu