View Single Post
  #1   Report Post  
Old August 23rd 06, 12:08 PM posted to rec.radio.amateur.homebrew
[email protected] hq105862@hotmail.com is offline
external usenet poster
 
First recorded activity by RadioBanter: Aug 2006
Posts: 2
Default selecting bias inductors for amps

Hi,

I've been sleceting inductors for chip amplifiers based on the
datasheets, but I would really like to understand what I should be
doing.

If I am designing an amplifer that is to operate over say 3.4 to
4.2GHz, should I be looking for an inductor with self resonance above
that band, or at centre frequency, and why?

(I know that at self resonance, the inductor will be resistive, below
inductive, and above capacitive, but I don't know what I should be
looking for.)

Should I be looking for high Q or low Q, and for what reasons would I
choose each.

What numerical values actually equate to High Q and Low Q?

Is Q of 9 low, and Q of 35 high, for example?

thanks