AnsweredAssumed Answered

Noise Figure and Available Gain values on measurements

Question asked by ireiss on Mar 3, 2005
Latest reply on May 6, 2006 by MZachmann

Like • Show 0 Likes0
Comment • 5

Hello,

I suggest to plot the values of the NF and GA when performing linear measurements of Noise Circles and Available Gain (NCI & GA). When I do these measurements and use markers I only obtain the reflection coefficient or impedance values. It will help to get better understanding as to which impedances I should match an amplifier.

Thanks,
Itay

No one else has this question

Outcomes

5 Replies

ABOMPA Mar 4, 2005 1:03 AM
Mark Correct
Correct Answer
I am not quite sure if I an understand your question but I will give it a shot anyway. The marker is either reading S11 or Zin depending on how you have it setup. Either one will place you on the same point of the smith chart, therefore will give you the same result. If however, you want the input impedance but are unable to get it there are a couple ways to achieve this. You can either set up a 1 port file on Eagleware and plot Zin, or you can do it the hard way by using the equation:

Zin=(Zo*(S11+1))/(1-S11)

Again, I am not sure if this was what you were asking.
Like • Show 0 Likes0
Actions
ireiss Mar 4, 2005 1:55 AM
Mark Correct
Correct Answer
Hello,

It wasn't what I was asking, I meant that near each noise circles and gain circle besides plotting the impedance/reflection coefficient, you should also plot the respective NF and Gain values in dB.

The user sees a bunch of circles without any values of NF and Gain, which is the reason of using these circles to find the required impedance to obtain the values for NF/Gain.

Thanks,
Itay
Like • Show 0 Likes0
Actions
ABOMPA Mar 4, 2005 6:05 AM
Mark Correct
Correct Answer
I agree with you 100%. I made the same suggestion some time ago. Hopefully they will incoporate it in a future release.
Like • Show 0 Likes0
Actions
aandre Dec 31, 2005 3:04 PM
Mark Correct
Correct Answer
Hey guys, here's my newest song, titled "druid song": "how sweet is your elixir, how harsh is your adversary, upon desolate spirals and wastelands, you dwell. o druid, urban dove, alone in your sullen coven, in fading terrain, your glory will glide."
Like • Show 0 Likes0
Actions
MZachmann May 6, 2006 1:34 PM
Mark Correct
Correct Answer
Hi,

We'll look into this. You can display this stuff in a tabular fashion but it's not quite the same as a graph...

Mark
Like • Show 0 Likes0
Actions

Noise Figure and Available Gain values on measurements

Outcomes

Related Content

Recommended Content