Amazing read, thanks for sharing. It’s fascinating to see that it is now hobbyist-accessible to design and order a PCB that intercepts BGA connections, something that at the time was Microsoft’s sure-fire trick to disable JTAG.
i like those triple supplies from rigol. its much like the siglent you posted, but the 3rd channel is not fixed. its also fairly easy to script it with python. dp800 series.
Signal generators have an internal impedance of 50 ohms and expect a load of 50 ohms when the 50 ohm setting is selected. The 50 ohm impedance prevents reflections of high frequency (rf) signals as it changes mediums. Ideally you should not be using a signal generator to drive an output, but instead buffer it or use an amplifier. If you use high-z the output voltage is exactly what you set it to (e.g. 5Vpp) but with the 50 ohm setting the applies voltage is twice that with an internal resistance of 50 ohms.
… I’m sorry to say that was a joke, because well, capacitors like to go boom (MLCCs as in here not so much, but still).
What I do know though is that these MLCCs often dramatically change their actual capacitance with temperature, so maybe this is a sort of “temperature isolation” to keep the capacitor more stable? Honestly, no idea though.
I’d say that’s a version of a soft termination capacitor. They are used when there’s risk the board is flexed or exposed to mechanical or thermal shocks to prevent cracks in the capacitor (causing it to fail short).
They are called soft termination, I’m not sure if that’s available for every component, it came to my attention on ceramic caps. It’s a dedicated feature you can filter components e.g. on Digikey.
I’m slowly but surely working on making a phone with a RISC-V SBC. I installed Linux From Scratch on my Lichee RV board and am now taking a break to get some other stuff in my life taken care of. Once I have some more time I’m going to work on getting a tiny, physical keyboard set up for it.
Setting up a server from scratch, exploring the possibility of making an LTE expansion card for the framework laptop (mostly an excuse to get some experience back in PCB design), and automating the creation of frequency lists for specific Japanese anime for language learning. Progress on all of them is slow :) Also trying to get into the habit of writing myself a privare blog to keep track on some of the progress and learnings in each of these.
I am trying to optimize a general low-cost SMA end-launch connector’s footprint for OSHPark’s 4 layer board by attempting to get my return loss better than 20 dB for the entire frequency range up 8.5 GHz.
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