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Hi everyone,
I'm a bit confused with the different concepts of the "breakdown" of FETs. On Sedra & Smith (for those of you aren't in Canada, this book is pretty much the bible of fundamental IC designs in here), I understood three kinds of breakdowns well: weak-avalanche, punch-through, and...
Hi, could you establish more? For sure that for output matching, it makes sense to match the 50 ohms load to Zopt required by the FET. But what about in the case for input? Do you match Zin to 50 ohms source impedance, or 50 ohms to Zin* so that looking from the gate of the FET, it can see a...
So is it true that if the entire system operates at only one frequency and there is no divination away from this frequency during operation, then the matching networks in such a system have 100% efficiency?
Speaking of reflection, enjunear, my mind doesn't click on one thing. According to...
Thank you so much for replying me!
For question 1, do input and output impedance of a FET affect current it outputs? I mean, essentially FETs are voltage controlled current source. So if a FET has really small input impedance (the case of PA), in terms of voltage swing at the gate, it will...
Hi guys. I have two questions about power amplifier output matching network:
1. In THIS paper, the author states that "For highpower transistors, the device impedance are usually less than 10 ohms. This presents a difficult impedance matching problem in a 50 ohms environment. It often results...
Does this mean that if the load pull test tells me a Zopt value which can return the maximum power output, then I can design the output matching network to convert 50 ohms load into this Zopt appears to the FET, the dynamic load line will be in maximum swing length on the I-V curve?
Thanks!
I guess I was a bit confused between conjugate matching and matching according to Zopt provided by load pull test. According to Pozar (see figure below), the output impedance is defined as looking into the drain of the transistor, and load impedance is defined as looking into the output...
Hi everyone, I suddenly had a brain cramp and confused myself on this question I thought I understood:
After obtaining the load pull result and the corresponding impedance value from ADS (shown in figure attached), is this impedance value (8.779+j3.15) Zopt, or conjugate of Zopt? In other...
Hello everyone, I'm new to this forum and excitingly this is my first post at here!
I'm now working on design a Doherty power amplifier. I have read through the chapter on Doherty amp in RF Power Amplifiers for Wireless Communications by Cripps and everything makes sense, except two things...
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