Nbucska, I apologize for reacting so strongly earlier to the link. I couldn't tell that it was a signature before, but the dashed line separates it well from the body of your message. Thanks for noticing the problem and making the suggestion, Macgyvers.
Anyway, you're right; I didn't tell you...
T-line is 1/10 lambda; right. According to the rule of thumb that I learned, that's about borderline for what can be considered short, and what can't.
The bandwidth is unknown, but I do know at the moment that the devices I'm working with resonate at 400 to 500 MHz, and later devices may...
Thanks for the tip, but I'm aiming for the highest possible transformation ratio (several hundred, at least--limited by component Q), so I've designed my own circuit. I'm having the board manufactured now, so I'll just have to see when it comes in and I populate it how the circuit behaves.
The RF impedance IS 50k, but the conventional model for transmission line termination breaks down at these values, so it turns out that it will work well enough anyway. There may be a fair amount of loss due to the reflections, but the instruments will still pick up what does come through...
Logbook, I minimized the package capacitance by removing the copper pour below the chip and grounding the package. The reactive impedance of the on-chip circuit is expected to be about ten ohms; it's the real impedance that I'm worried about.
Just taking the area of the silicon from a copper...
The DC impedance was originally quoted to me as 10G ohms, with 10 ohms LC DC impedance. I probably won't be able to verify the 50k until Monday, but it seems a bit more reasonable in light of the 10G DC.
(Yes, I know these values sound outrageous; they are.)
Thanks for the prompt reply, Comcokid! The parameters were all given to me by others, but I'll see if I can get more accurate values at RF. 50k was actually an estimate on my part; all I heard from the physicists designing the chip is that the impedance is "very large." Anyway, I'll try and...
Hi,
I'm working on an RF (~500 MHz) impedance transformation circuit. On the chip side of the circuit, I have a 3cm microstrip transmission line connecting the 50k ohm-impedance chip to the 50k ohm-impedance side of the transformation network. The characteristic of impedance of the line is...
