How to generate a "process independent" current so

Status
Not open for further replies.
Q

qpau

Newbie level 3
Joined
Feb 18, 2005
Messages
4
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,312
I have a voltage signal and I want to use this voltage signal to generate a current output.
The simplest way is use V/R=I.
However, the R comes with serious variation in semiconductor process.
How can I use a known voltage signal to generate a "process independent" current output?
 

Re: How to generate a "process independent" curren

u can go through allen hallberg's book about current reference chapter , this will give you the initial idea about process independent current source.
wish u good luck.
 

use a resistor out of chip, it is process independent.
 

Re: How to generate a "process independent" curren

The variation is always there but you can minimise it by using proper layout technique...
 

bandgap reference may satisfy you.
 

Re: How to generate a "process independent" curren

bandgap voltage reference with extenal precission resister regulation.
 

ya BGR will be u seful for it.
 

I don't understand why you need this kind of current. PTAT is useful in chip.
 

Re: How to generate a "process independent" curren

Use bandgap voltage across a resistor!
 

Re: How to generate a "process independent" curren

spbhu said:
Use bandgap voltage across a resistor!
Click to expand...

If I need a high quality current output (with large output resistance), can I just use bandgap voltage across a resistor!
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…