melkord
Full Member level 3
Hi,
I am designing this opamp with TSMC_SCN_2P3M 0.35µm tech.
So far I am trying to mix and match recipe from books and some threads in this forum.
But every step always give me some confusion because each equation has more than one unknown variables, unless I use some values from tables in the books.
I have some questions:
1. Which L should I use for my technology?
from here, for 0.18µm, the L used is 0.35µm.
2. which table should I use e.g. for VDS,sat, Vth, Von?
I am borrowing Baker 2ns ed. Table 9.1 p.292 and Table 9.2 p300 for long and short channel, respectively.
I am borrowing Gray as well.
3. Should I define Vbias-es first or W/L first?
I feel this is like a chicken and egg problem, lol.
I am aware that there have been so many thread discussing this topology but they are not exactly like mine.
If someone can point me where to look, I really appreciate it.
the spec:
Av0 = 90dB
Fugb = 12 MHz
SR = 10V/µs
PM = 70 deg
Vout,pp = 2.5V
Vsupply = +1.65v, -1.65v
I am designing this opamp with TSMC_SCN_2P3M 0.35µm tech.
So far I am trying to mix and match recipe from books and some threads in this forum.
But every step always give me some confusion because each equation has more than one unknown variables, unless I use some values from tables in the books.
I have some questions:
1. Which L should I use for my technology?
from here, for 0.18µm, the L used is 0.35µm.
2. which table should I use e.g. for VDS,sat, Vth, Von?
I am borrowing Baker 2ns ed. Table 9.1 p.292 and Table 9.2 p300 for long and short channel, respectively.
I am borrowing Gray as well.
3. Should I define Vbias-es first or W/L first?
I feel this is like a chicken and egg problem, lol.
I am aware that there have been so many thread discussing this topology but they are not exactly like mine.
If someone can point me where to look, I really appreciate it.
the spec:
Av0 = 90dB
Fugb = 12 MHz
SR = 10V/µs
PM = 70 deg
Vout,pp = 2.5V
Vsupply = +1.65v, -1.65v