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DDavid said:Hi,
1. Usually freq space it's about 1-2MHz (maximum 5MHz) otherwise biasing of amp will influence... never mond long story!
2. About input power you want to check LINEARITY of lna so you must be at linear part of yhe amp! How you check if you are in linear part you increase 1 dB on signal generator and f1 increase also by 1dB BBBUT the side band will increase only by 3dB (of cource it's true with two signal)
Anyway if you need anything else or papers about this essu tell me
David
DDavid said:Hi,
Read the folowing paper about increase IP3 in balanced Amp
You wiil see that when you using balanced Amp how much you can improve IP3.
In this paper you wiil find exact (simple) formula to this!!!
h**p://www.mimixbroadband.com/PDFfiles/PA%20app%20note.pdf
David
hi, i was searching for OIP3 information and i came across this thread.
I also have a similar question for the Pros here. I came across this situation when i work on LNA, all the while i'm thinking, as long as i very far below the P1dB point,then my OIP3 should be accurate because i'm in linear region, but i did two experiment:
1)two -10dBm input power, and the delta_IM3 i'm getting is around 79dB
2)two -20dBm input power, the delta_IM3 i'm getting is still around -80dB!
I know if i deliberately choose -10dBm as my input power level,then surely i getting a higher OIP3 according to the maths, but i wish to understand, why is it if i put -20dBm input power, the delta_IM3 product i'm getting is similar?
Do anyone came across this situation before?
Thanks in advance Pros.
James