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Title: New RF FET Post by: VE3ELQ on May 20, 2019, 08:28:25 AM ART2K0FE by Ampleon coming soon to a store near you. At 65V Vdd should be good for about 1.5KW clean PEP in linear service. Cant find any specs yet. Think I see another Linear amp project ahead.
https://www.ampleon.com/news/press-releases/ampleon-announces-the-industry-s-most-rugged-2kw-rf-power-ldmos-transistor-for-ism-applications.html 73s Nigel Title: Re: New RF FET Post by: w4bfs on May 20, 2019, 10:46:25 AM nigel ... what type of topology would you use with a device of this power level ? would it still be push pull or is single ended feasible ? 73 John
Title: Re: New RF FET Post by: VE3ELQ on May 20, 2019, 11:06:13 AM nigel ... what type of topology would you use with a device of this power level ? would it still be push pull or is single ended feasible ? 73 John John, About 4 years ago I built a 50V Linear amp using a single BLF188XR dual FET from schematics I found in the net with a few mods of my own. Its classic push pull with a bifilar choke on the drains feeding a ferrite 1:3 turns OP transformer. It worked great, nice and clean to about 850W PEP with my ANAN 10 exciter especially with Adaptive Pre-Disortion enabled. So I quickly built a second one using two BLF188s in a near identical circuit but with a 1:4 ratio OP transformer. It makes nice clean 1.6KW PEP and is still in use when I get the occasional urge to run SSB. This new FET looks to be even better at 65V for higher efficiency. Never tried single ended, probably have very high F2 harmonic hard to low pass filter. I think push pull would be best. Think a 3rd amp may be in my future. ;D 73s Nigel Title: Re: New RF FET Post by: WD5JKO on May 21, 2019, 07:14:14 AM This just came out in EDN today: "Rugged 2-kW RF Power LDMOS Transistor for ISM Apps Ampleon’s transistor offers a frequency response of 0 to 650 MHz in an air-cavity ceramic package." https://tinyurl.com/y2wedtsj OR https://www.electronicdesign.com/power/rugged-2-kw-rf-power-ldmos-transistor-ism-apps?NL=ED-001&Issue=ED-001_20190521_ED-001_451&sfvc4enews=42&cl=article_2_b&utm_rid=CPG05000000131357&utm_campaign=25681&utm_medium=email&elq2=d503c368beeb4f78bac2fb06026cb3ec&oly_enc_id=7566A7103945E5R Jim Wd5JKO Title: Re: New RF FET Post by: W1RKW on May 21, 2019, 04:41:57 PM this appeared on EHam a month or so ago: AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
https://www.eham.net/articles/42414 Author talks about a 1.2KW LDMOSFET from the same manufacturer and a homebrew amplifier . |