Biasing Small Signal RF amplifier?

[JIF]

any help on design a bias circuit for Class A amplifier for small signal to satisfy Stable amplifier for Temp.,with low Power consumption(for example:BFR93A NPN,Vce=6V,Ic=1.5mA).And what is the best configuration of the bias network.if there is a Rule of Thumb of the value of VE,VB,RE,R1,R2,RC of the network it will be good.if there is application note explain this subject I will appreciate that.

Thanks.

 

[AL0117]

Hi,

You can use as starting point the free program Appcad. There are some nice bias calculation routines. It can be downloaded from :

hxxp://www.hp.woodshot.com/

(replace xx with tt).

About the theory, it can be found in the book (and in many other books) by Gonzales " Microwave Tranzistor Amplifiers Analysis and Design", chapter 3. It was available some time ago at the mcu, if you don't find it send me a PM.

rgds,
Al

 

[J1Lee]

The following Application Note from Agilent should be helpful.

 

[pokemon]

this transistor has model in pspice .and you can use it for simulation. For circuit which you seek I think that you can see many example of class A in Razavi's book - RF Microelectronics ( in chapter LNA)

 

[JIF]

thanks AL0117,I find it very useful,but I think the configuration for (RE,RC,R1//R2) is not available in AppCAD! and I think this configuration is the best for Temp. Stability over large change such as ±50C°,what you think?

Mr. J1Lee Where is the application note!

Added after 14 minutes:

Thanks Mr.J1Lee,I find the appnote it is very useful.

regards

 

[g579]

Appcad has the capability you need.
Go Active Circuits, scroll down twice, or more, and you will find the bias calculator you need.
g579