Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic 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

Problem with 2 stage fully differential opamp with SC CMFB

Status
Not open for further replies.

tompham

Full Member level 2
Joined
May 29, 2010
Messages
133
Helped
29
Reputation
60
Reaction score
29
Trophy points
1,308
Location
usa
Activity points
2,066
Hi all
I have problem design 2 stage fully diff opamp with sc cmfb. I am using 0.18um from tsmc process. When I run w/o sc cmfb the gain about 65db, phase margin 64 degree and GBW~540Mhz. If sc cmfb is connected the gain a little bit reduce to ~60db but outputs from negative and positive have diff result for GBW and phase margin and GBW reduce a lot 376Mhz compare to 540Mhz. I knew the sc cmfb make this happen but I have no idea how to fix this. I have no spectreRF tool to design and run sc simulation. I need help from anyone. Thanks a lot
BTW: anyone know any free tool to run sc beside spectreRF from cadence please show me website to download it.
 

Status
Not open for further replies.
Toggle Sidebar

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top