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I stumbled across a PDF describing a novel way of matching LDMOS transistors in medium-power applications by W1GHZ: Simple Broadband Power Amplifiers.pdf. I figured "hey, I'm working with an LDMOS transistor!" so I used the full model provided by NXP for the AFT09 FET and built up a...
Alright, I'm getting frustrated with myself as I can't seem to wrap my head around what should be pretty basic topics.
I can get a great match to the input impedance at a give frequency using the ADS optimizer, or just doing it by hand. Same goes for the output impedance. I'm just very confused...
Thanks for the advice everyone. What I hadn't even considered was that the device I had chosen isn't really good at my UHF frequencies anyway. Check out the S21 for the 440 band - it's only about 2.5dB or so!
My VHF design for this chip seems to match up great, so I'll use that for the VHF...
I originally tried to use the Matching Wizard in ADS, but it only works for one impedance at a time (as far as I could tell) and for an amplifier both sides of the device need to be tuned at the same time since they interact with each other. I could get each side of the FET matched individually...
I apologize but I'm not sure what you mean by a Q-curve. Perhaps if you had links to the application notes that would be helpful. I would prefer to stay away from transmission line matching because of the space requirements needed, but if it's the only way to get a good match I suppose I don't...
Hi all!
I'll preface this all by saying while I'm familiar with most of the basics of RF & PCB design, I'm entering new territory here and am definitely well outside my comfort zone.
I'm working on a design based on the RD15HVF1 transistor from Mitsubishi. It claims 15W of power from VHF...
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