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AM Power Amplifier - 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.


SDO
Post subject: AM Power Amplifier Posted: Tue Sep 22, 2009 2:50 am

Captain


Joined: Tue Aug 26, 2008 5:18 am
Posts: 22
Location: UK
Hello all,
I need some help about designig power amplifier for 150kHz-1650kHz appliaction.
Gain requirement is better than 40dB with P1dB above 43dBm. Supply voltage 24V.
It is going to be two stage single ended design. I was thinking about using MW6004N as a driver. I am not sure if MRF281 can be used for this application as well.
Any info about the available devices along with some literature for matching networks will be appreciated.

Regards.


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LM317
Post subject: Re: AM Power AmplifierPosted: Sat Sep 26, 2009 9:53 pm

Captain

Joined: Tue May 20, 2008 8:13 pm
Posts: 5
Looks like the MRF281 is going to be out of production soon, so I wouldn't recommend designing it into a new product. It's advertised for applications with frequencies from 1 to 2.5 GHz, way far away from the AM band. Its s-params only go down to 100 MHz.

http://www.freescale.com/files/rf_if/doc/data_sheet/MRF281.pdf

I can't find any data on an MW6004N. Who makes it?


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SDO
Post subject: Re: AM Power AmplifierPosted: Mon Sep 28, 2009 9:34 am

Captain


Joined: Tue Aug 26, 2008 5:18 am
Posts: 22
Location: UK
Hi,
Thanks for your response. Yes, you're right not to use MRF281. The other device was MW6S004NT1
http://www.freescale.com/webapp/sps/sit ... T1&fsrch=1
Any idea about power device which can deliver 10-20w at 1MHz and 24-28V?
Thanks


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IR
Post subject: Re: AM Power AmplifierPosted: Tue Sep 29, 2009 3:15 pm

Site Admin


Joined: Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
You may try Polyfet www.polyfet.com

They have line of RF Power Transistors for low frequencies also suitable for AM.

Good luck!

_________________
Best regards,

- IR


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SDO
Post subject: Re: AM Power AmplifierPosted: Wed Sep 30, 2009 3:48 am

Captain


Joined: Tue Aug 26, 2008 5:18 am
Posts: 22
Location: UK
Hi,
Thanks for your reply. Polyfet has got some devices and I have seen some more at semelab as well.
Thanks gain.









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