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

channel length and cascode maximum gain point

Status
Not open for further replies.
G

GSarris

Member level 1
Joined
Mar 27, 2009
Messages
41
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Location
Netherlands
Activity points
1,616
Hello i have designed a cascode opamp and i have one question. I use the 0.18um process and when i increase my channel length (starting from the minimum length) the maximum output gain occurs for a lower Vin. Do you have any ideas why that should happen? Shouldn't that occur for higher Vin, since the threshold voltage of the transistors increases with incresing channel length? What do i get wrong? thank you in advance
George
 

Is VIN also affecting your bias current and making the
FETs more saturated at lower VIN -> lower Ibias?
 

Here is my entire schematic. PLease look it and tell me if you have any idea.
Thank you in advacne! cascode_0.18u.png
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top