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.

a question about refence on simulation and corner

Status
Not open for further replies.

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
corners simulation resistors

i design a bandgap reference ,my bandgap voltage output is different at different mode ,such tt ss ff fs sf,but i can trim the two resistor to regulate the output and make output meet requirments .Becuase my design need precise value ,so the struction is can't be changed .
i want to ask :
one: is it reasonable in design that bandgap has different value at differnt mode ?
two: two resistors needs be trimmed ,is it i reasonable in actual chip ?.
 

hanson_uestc

Newbie level 4
Joined
Aug 20, 2004
Messages
7
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
59
i think you have to modify some devices parameter to obtain the idential output voltage at different corners,you can trim resistor to regulate the voltage,but commoly triming just adjust the voltage at tt corner.
 

allan_guo

Junior Member level 3
Joined
Jan 6, 2006
Messages
28
Helped
4
Reputation
8
Reaction score
2
Trophy points
1,283
Activity points
1,555
trimming two resistor is reasonable.the match must be good
 

dennislau

Member level 1
Joined
Dec 16, 2005
Messages
34
Helped
3
Reputation
6
Reaction score
2
Trophy points
1,288
Activity points
1,634
xerxer said:
i design a bandgap reference ,my bandgap voltage output is different at different mode ,such tt ss ff fs sf,but i can trim the two resistor to regulate the output and make output meet requirments .Becuase my design need precise value ,so the struction is can't be changed .
i want to ask :
one: is it reasonable in design that bandgap has different value at differnt mode ?
two: two resistors needs be trimmed ,is it i reasonable in actual chip ?.

The bandgap voltage should not be too much different at different corners. I guess some of the current mirror transistors go to linear region at different corners. You need to check all the transistor region at all cases.

And, what topology are you using?
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top