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I understand PCIe can sometimes be quite flexible in terms of lane usage. But where I get confused is what flexibilities always exist vs which only sometimes exist. This is my understanding:
You can swap P/N within a pair. There is no requirement that if you swap RX0 on a x4 interface that you...
Hi - I want to know what type of transistor can be most optimized for SOA. So far it seems like FETs can be way, way better for SOA. But nobody has confirmed this. For example, for short pulses (what I'm most concerned about) - that BJT can do 50A. The FET I linked to earlier can do 900A... (and...
Sure, I agree. But the point of this thread is that I'm wondering if I'm only going to find nice SOA curves like that on FETs, or if any other transistor types have similarly high SOAs.
Take a look at figure 11 on the NVMFS5C410N datasheet. 900A.
The part I'm looking at is not released so I cannot post datasheet - but 600A is not unreasonable.
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With fast transients (<1ms) I think the size of the silicon is more important than the size of the body, no...
Hi Klaus - I looked at a few BJT datasheets and they simply didn't have an SOA curve.
After seeing your message - I did some more looking and it seems like some newer parts do include SOA curves.
So far I'm seeing drastically higher SOAs for FETs than BJTs. The shorter pulses (1ms and less)...
Hi - I'm interested in making a active clamping circuit to reduce spikes seen by sensitive electronics on a noisy supply line. Essentially think TVS/zener but with better tempco, steeper IV curve, etc. Just like a TI flat clamp, but higher power capabilities.
One thing that I was not sure about...
I'm working on a Excel calculator and have run into something odd. My understanding was that you could calculate standard resistor values via this formula:
100*ROUND(10^(X/Y),2)
where Y is the series (E48, E96, E192), and X is any number from 0 to 47/95/191. I also thought that you could do...
Hi - I have been working on researching and understanding SEPIC power supplies. I was able to calculate duty cycle (and everything else that was interesting to me) of a SEPIC (operating in continuous mode) when the inductors are not coupled. I made the assumption that the capacitors had a...
Hi - I am looking to layout a PCB that has two Issi IS43DR16320C-3DBL DDR2 SDRAMs. See here for the datasheet.
They are connected with the addresses together and one chip provides my lower two bytes and the other provides my upper two bytes.
I've been reading up on laying out DDR2 on PCBs and...
Hi - I have a 0-2.8V signal with about 75K source impedance. That impedance is not tightly controlled, however. I would like to scale the 0-2.8V signal down to about 0-1.85V. I need the scaled signal to to be low impedance (less than 1K).
This is for an audio signal - a DAC is generating a...
Hi - thanks for the response! I'm using a Class D so it's tricky to just look for it to be clipping (unless you know something I don't). I had previously (when using a class AB) been using a scopes FFT function to compare the 1KHz output (as I was testing at 1KHz) with other harmonics that...
Hi - I'm working on an audio amplifier circuit and would really like to measure the THD+N of it. I know Audio Precision devices are one of the standard ways of making this measurement, but can anybody suggest a method of doing so using more common equipment? Has anybody had success with using a...
Right now I'm just trying to understand how to read the datasheets of these parts. Once I understand the datasheets better I will have a better chance at selecting one that fits my application. My application is not overly high end. I do understand that I could answer my questions with some good...
Hi - I'm working on a design that will use an electret microphone. I've never used one before, so I am a little lost here.
First off, I'm trying to understand the sensitivity of these devices.
1. It seems the standard is to rate them in dba, where 0dba = 1V/pascal at 1KHz. So a 0dba microphone...
Well that's sort of my question... Sure you can look at a component and say "that looks too small for 20A" - but that isn't a spec. That's a gut feeling. I want a spec. Or a formula. Or something!
I've asked a manufacturer the same question - I hope they get back to me with something useful!
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