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AM Power Amplifier - RF Cafe Forums

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


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.




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


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.


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



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


Joined: Tue Aug 26, 2008 5:18 am

Posts: 22

Location: UK


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?




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



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


Joined: Tue Aug 26, 2008 5:18 am

Posts: 22

Location: UK


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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