Increasing bandwidth 2 stage opamp cmos

[elpajuo]

I am designing a 2 stage differential cascode opamp with 2 outputs
The circuit and gain are attached

How can I increase the bandwith of the circuit or operate at higher frequencies



Thanks

 

[slamnas]

hello,
You should know that we always Gain Bandwidth Product is constant, if you increase the gain will decrease the bandwidth and vice versa. Use a simple cascode amplifier or increase the output current. The bandwidth is proportional to Iout.

 

[tompham]

Hi
I can not see how large is your bandwidth. I have designed fully diff 2 stages op amp 1.8v has 500Mhz bandwidth. 61db gain and 64 degree phase margin. I use standard 2 stage op amp (no cascade). I think you can improve your bandwidth from 800Mhz to 1ghz

 

[eng.mohamed.sabour]

Hi
I can not see how large is your bandwidth. I have designed fully diff 2 stages op amp 1.8v has 500Mhz bandwidth. 61db gain and 64 degree phase margin. I use standard 2 stage op amp (no cascade). I think you can improve your bandwidth from 800Mhz to 1ghz

Can you show us the design of this circuit?

---------- Post added at 14:38 ---------- Previous post was at 14:27 ----------

As slamnas said the relation between the gain and the bandwidth is Inverse proportion, and i saw it when i designed 2 stage op amp with cmos.