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TRANSISTOR FOR EFFICIENT 900 MHz, 100mW PA ? - RF Cafe Forums

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STEVER

Post subject: TRANSISTOR FOR EFFICIENT 900 MHz, 100mW PA ?

Unread postPosted: Thu Sep 02, 2004 6:59 am

Any suggestions on a nice transistor for a PA at 900MHz with good efficiency? Spec:-

Pout: 50 to 100 mW

Supply rail: 3 Volts

Frequency: 900 MHz

Bandwidth: Narrowband

Class: Probably C or harmonic terminated etc (need best efficiency)

Efficiency: Target of better than 60%

Transistor type: Fet or Bipolar

Size: Small parts preferred

Cost: Not critical

Top

GUEST

Post subject: Any suggestions on a nice transistor for a PA at 900MHz with

Unread postPosted: Thu Sep 09, 2004 2:08 pm

I've had some great luck with an Infineon BFP450

at those levels, efficiencies and frequencies. Hint

use a constant current source bias.

Top

GUEST

Post subject: 100 mW amp

Unread postPosted: Sat Sep 11, 2004 9:03 am

Don't know if this is better, the efficiency may be a bit off,

but talk about simple...

[url]http://www.semiconductors.philips.com/acrobat/datasheets/BGA6589_1.pdf

[/url]

Top

Guest - IFX

Post subject:

Unread postPosted: Sat Sep 11, 2004 11:42 pm

Dear Guest,

Use only Infineon BFP450 for your application. It is very stable and easy to tune to 900MHz.

It is a SiGe Device with Ft of 25GHz

Datasheet:

http://www.infineon.com/cmc_upload/docu ... bfp450.pdf

Application Notes:

http://www.infineon.com/cmc_upload/migr ... pli026.pdf

More Info:

http://www.infineon.com/cgi/ecrm.dll/ec ... ?oid=13759

If you need more gain add BFP420 / BFP 520 / BFP 620 as a driver to your +20dBm PA.

With Best Regards,

Guest - IFX

Top

STEVE

Post subject:

Unread postPosted: Mon Sep 13, 2004 9:12 am

Thanks to you all,

Strange (or maybe not) but I ended up prototyping a BFP450 amp last week. Performance is reasonable without trying very hard (circa 45 to 50% collector eff') but quite a bit harder to get any more efficiency than that. I tried a harmonic termination of 2F and then 3F but this did not gain me much for quite a bit more complexity!

Thanks again anyway

Posted  11/12/2012

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