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AMPLIFIER_200_400MHz - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


jarys
Post subject: AMPLIFIER_200_400MHz Posted: Thu Nov 03, 2005 5:44 pm

Lieutenant

Joined: Thu Nov 03, 2005 5:34 pm
Posts: 2
Location: POLAND
I want to make about following parameters amplifier :
G 40dB
P1dB 44dBm
gangs 200-400MHz
Class AB

I need relating information:
- the influence of temperature on parameters the VDMOS, LDMOS.
- the selection of transistors (what firm ???)
- on what was one should be careful,

I found the solution firms polyfet, motorola, philips, macom.
Are yet some firm ??

thanks for information


Top

IR
Post subject: Posted: Sat Nov 05, 2005 11:23 am

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Hello jarys,

The vendors you mentioned are the right ones. You should carefully check for the right device. Most of the vendors provide an application circuit for each device. The most important part of a PA circuit are the matching networks in the input and output. These networks also are designed for the required BW of operation. Your BW is octave, which is very wideband. So you should carefully examine this issue.
You should also pay attention to the bias feesing circuit. There should be a good isolation between the the RF output and the DC supply, and the bias level should be adjusted to provide the required linearity and output power level.

Good luck!

_________________
Best regards,

- IR



Posted  11/12/2012
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