axel3
Newbie level 4
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 through to 500 MHz, and it seems like a perfect choice for my application (small mobile radio amplifier running on 12V).
Using ADS, I'm trying to get matching set up using the supplied S parameters from Mitsubishi. On my VHF circuit (138-152 MHz) I was able to get a great match with relative ease. I just used the optimization tool and tried for best S11 and S22, and that seemed to do the trick.
(plotted results and circuit diagram for VHF section)
However, trying the same method on my UHF design (430-450 MHz) is causing me headaches. I can't get my optimization to work, and I've tried several different layouts of matching networks including simple LC and Pi/Tee. My lack of experience is showing here, and I don't have the intuition required to "know" what kind of matching circuits would work best here.
(not-so-great UHF matching attempt)
I'd appreciate any suggestions or advice! This is my first amplifier design project and I'd love to be able to get it to work with minimal fuss.
Thanks!
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 through to 500 MHz, and it seems like a perfect choice for my application (small mobile radio amplifier running on 12V).
Using ADS, I'm trying to get matching set up using the supplied S parameters from Mitsubishi. On my VHF circuit (138-152 MHz) I was able to get a great match with relative ease. I just used the optimization tool and tried for best S11 and S22, and that seemed to do the trick.
(plotted results and circuit diagram for VHF section)
However, trying the same method on my UHF design (430-450 MHz) is causing me headaches. I can't get my optimization to work, and I've tried several different layouts of matching networks including simple LC and Pi/Tee. My lack of experience is showing here, and I don't have the intuition required to "know" what kind of matching circuits would work best here.
(not-so-great UHF matching attempt)
I'd appreciate any suggestions or advice! This is my first amplifier design project and I'd love to be able to get it to work with minimal fuss.
Thanks!
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