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.

What to do when the value of Vgs is unknown?

Status
Not open for further replies.

suhas_shiv

Full Member level 2
Joined
Nov 30, 2005
Messages
136
Helped
11
Reputation
22
Reaction score
4
Trophy points
1,298
Activity points
2,461
Value of Vgs

When designing, say, a current mirror, you find the value of R and W/L. But you have to know the value of Vgs for that. Usually, in any book, Vgs is assumed to be some value for a particular technology. How do you actually design if the approximate value of Vgs(for a particular technology) is not known( Vgs depends on biasing also)?

Thanks
 

paulux

Advanced Member level 4
Joined
May 16, 2005
Messages
112
Helped
11
Reputation
22
Reaction score
2
Trophy points
1,298
Activity points
2,339
Re: Value of Vgs

There is no general rule for designing Vgs and it depends on your application. In low Vdd application, you try to minimize Vgs. If it operates at saturation region, Vgs>=0.2V. Just an example, this absolutely depends on process technology
 

jluhzw

Member level 5
Joined
Nov 15, 2004
Messages
94
Helped
17
Reputation
34
Reaction score
4
Trophy points
1,288
Location
Hangzhou China
Activity points
759
Re: Value of Vgs

I gree with paulux.there is no absolute way.It depends on your applications and your fab technology.
 

xerxer

Junior Member level 3
Joined
Nov 15, 2005
Messages
29
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,523
Re: Value of Vgs

you may try to set up a simple circuit to simulation the vgs using hspice or pspice .
i think the method probobly help you to get you vgs .THis is just an advice
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top