I have a basic doubt here. For any circuit, what happens if we increase the Ls of all transistors, keeping the bias circuit same. Will it increase the Vgs of the transistors to keep the same previous current in the circuit as per the square law equation ?

Thanks,
Kanu

Hello AnalogDE,

Thanks for your help. I have further query. We have a level convertor circuit in our project, which is not working across lower temperatures in the range of -25 to 125 C. I understand that threshold voltage, Vth of transistor increases with decrease in temperature. So I tried increasing L and found that the circuit worked fine at lower temperatures as well.

So I wanted to confirm if this behavior is expected as per the explanation of increasing L increases Vgs for same current and drives more transistors in saturation ? If so, what constant biasing should I be referring for my explanation .... is it the input of level convertor which has not changed ?

Thanks,
Kanu

Can you please post a schematic of your circuit?  I'm not exactly sure what's going on.  Also, what do you mean by "working"

These circuits are kind of tricky because they rely on contention.  Sweeping L is doing something to your P-N ratio strength -- I suggest you narrow down exactly which one of the four level shifters is failing, then you can analyze the fail point deeper.  You can see how much drive you get at the gate of the switching PMOS (drain of NMOS pulling down) when switching and compare failing vs passing cases.