[SOLVED] What is active biasing in LNA design?

[rula]

HI,
I am interested in a LNA design using BJT for low noise.
I am told to use an active biasing to minimise the noise figure and also have a lower VSWR ratio.

Does anyone have idea what is active biasing and where can I find information on it?
Thanks for the help
Rula

 

[bouchy]

Re: LNA design

The term active biasing means that you are using transistors that are operates in active region to bias you’re LNA, i.e. LDO or op Amp buffer…
I hope that this helps.
Bouchy

 

[rula]

Re: LNA design

You are wrong.... I did not ask about biasing in active region. I am referring to biasing method...active biasing....

 

[bouchy]

Re: LNA design

Sorry for my miss understanding.
Good luck,

bouchy

 

[mbyoussef]

Re: LNA design

Active bias is used to maintain performance over PVT variations.

You may wanna read this paper:

A 2.7-V gsm rf transceiver IC, JSSC december 1997

 

[khouly]

LNA design

the active biasing , it to use , other active device to bias ur LNA , this decice could be current mirror , current soure band gap reffernce

khouly