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| TRANSISTOR FOR EFFICIENT 900 MHz, 100mW PA ? - RF Cafe Forums | ||||||
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Below are all of the forum threads, including all the responses to the original posts. 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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