Author Topic: A formula for input matching with a source inductor  (Read 1198 times)

0 Members and 1 Guest are viewing this topic.

Offline LM21Topic starter

  • Regular Contributor
  • *
  • Posts: 102
  • Country: fi
A formula for input matching with a source inductor
« on: September 15, 2023, 08:36:07 pm »
There is way to get a good noise match of a fet with only a source inductor. Does anybody know where I could find a formula and more info about it?
 

Offline RFDx

  • Regular Contributor
  • *
  • Posts: 158
  • Country: de
Re: A formula for input matching with a source inductor
« Reply #1 on: September 16, 2023, 06:15:46 am »
John Rogers & Calvin Plett (2003): Radio Frequency Integrated Circuit Design, Artech House, Boston/London.

Chapter 6.3.3 (p163): Input Matching of LNAs for Low Noise.
 
The following users thanked this post: radiolistener

Offline radiolistener

  • Super Contributor
  • ***
  • Posts: 3597
  • Country: ua
Re: A formula for input matching with a source inductor
« Reply #2 on: September 18, 2023, 03:44:25 pm »
John Rogers & Calvin Plett (2003): Radio Frequency Integrated Circuit Design, Artech House, Boston/London.

Chapter 6.3.3 (p163): Input Matching of LNAs for Low Noise.

Radio Frequency Integrated Circuit Design, Second Edition, John W. M. Rogers Calvin Plett, 2010 ARTECH HOUSE
page 191: 7.3.4 Input Matching of LNAs for Low Noise

 

Offline LM21Topic starter

  • Regular Contributor
  • *
  • Posts: 102
  • Country: fi
Re: A formula for input matching with a source inductor
« Reply #3 on: September 18, 2023, 05:49:32 pm »
Thank  you both. Now I don't have to  visit university Library.
 

Offline LM21Topic starter

  • Regular Contributor
  • *
  • Posts: 102
  • Country: fi
Re: A formula for input matching with a source inductor
« Reply #4 on: September 18, 2023, 06:04:19 pm »
At a quick read I see that this book uses ICs as even its name says. Things are different when you cant spread the fet gate, I'll buy a fet or bipolar. (Or I 'll use a low noise RFIC.) Do you know is there enough info here to use ontheself transistors.




 

Offline RFDx

  • Regular Contributor
  • *
  • Posts: 158
  • Country: de
Re: A formula for input matching with a source inductor
« Reply #5 on: September 18, 2023, 11:54:18 pm »
I'll buy a fet or bipolar. (Or I 'll use a low noise RFIC.) Do you know is there enough info here to use ontheself transistors.

You can use any off the shelf transistor(s) you like. Attached are two simple examples, 2m RF preamps with 50 Ohm I/O. The first preamp with a BFR106 (@5V/25mA) BJT and the second with J309 JFETs in cascode configuration, both not optimized for lowest possible noise.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf