Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Increasing bandwidth 2 stage opamp cmos

Status
Not open for further replies.
E

elpajuo

Junior Member level 2
Joined
Mar 11, 2009
Messages
22
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,283
Activity points
1,452
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

 

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.
 
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
 
tompham said:
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
Click to expand...

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.
 
Last edited:

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top