[SOLVED] power amplifier line width

Status
Not open for further replies.
S

sohaee

Junior Member level 2
Joined
May 28, 2016
Messages
20
Helped
1
Reputation
2
Reaction score
1
Trophy points
3
Activity points
153
Hi every one!
I want to layout a PA in CMOS, I know the maximum current density, allowed for the lines, my question is that, should I choose the line width for the DC current or the peak current?

If the answer is peak current, then should I be careful for high currents at the start of the operation? I mean the transient region. that will be too much then!

would you please help me?
 

Hey,

You should consider RMS current, which is the Ipeak*SQRT(Duty Cycle). The reason is that the RMS is what actually generates heat.
 
Reactions: sohaee

    S

    sohaee

    Points: 2
    Helpful Answer Positive Rating
Hi,

True.

Just a remark:
Some (true) RMS measurement devices block DC for the measurement.
They show "0 A" when there is pure DC current. They show only the RMS of the AC components.
But here you need to take DC into account for the RMS measurement.

Klaus
 
Reactions: sohaee

    S

    sohaee

    Points: 2
    Helpful Answer Positive Rating
 

Thank you again for answering and the article! But still, I think, this is the DC current which leads to electromigration, As it is mentioned in the article:
" However, one must realize that Joule heating is caused by root mean square (RMS) current and not by the average current, as is electromigration."
Anyway I think what you said is true, and if we take care of RMS current, in the way KlausST mentioned, In fact, we have seen DC current, too.
Again I want to thank you both for your very kind help!
 

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…