I know the LCDs and OLEDs are sample-and-hold but in time manufacturers could emulate a CRT lightgun seeing how OLED is self-emitting and the response time is quicker than CRT compared to 0.01ms.
#ON1 PHOTO RAW 2018 NOISE RIPPLE EFFECTS PRO#
and-hold/Īnd no worries, I don't think this is that off-topic, since the OSSC Pro and such are meant to provide CRT alternatives, and pairing them with OLED displays is the best option available for the next few years, but expectations should be set accurately. This article is pretty good at giving some perspective on what it takes to get to actual CRT motion clarity for all cases (basically need 1000Hz refresh rates, so we still have a long way to go). All sample-and-hold displays (LCD and OLED) have 16ms persistence blur and need some kind of flicker, strobing, scanning, etc. Maybe a bit of confusion going on here, but sample-and-hold is the display type, not a technique for addressing persistence blur. I really wish there was a thread dedicated to such discussions and solutions from engineers who build and test such stuff. I mean, what if I had a crappy supply only? this way all noise will go in if no proper filtering is done. I know this example is not similar to low voltage video design, but still won't hurt to do it properly. I had to put good filtering circuit for the 12v rail and input. However, since the input is 12v from any PSU you have = quality is not guaranteed. I've done a design of very low Dreamcast power supply (similar shape to DreamPSU) which I used only 1 47uF elec cap for each rail besides the ceramics. cap to ensure best circumstances to fight low frequency ripple and noise. I just like to put one big filtering elec. I use ceramics everywhere else, including the LC or Pi filter itself.
However, if I have the space and the cost isn't an issue nor the design (not coming after LDO = doesn't affect its feedback response) then going for bigger cap is good. I don't put 1000uF always, rather a 47u or something similar. this is typical of the least you can do to ensure low noise on any supply source. cap at the end (as big as I can afford) then finally a ferrite. I usually prefer doing at least one stage LC filter with on elec. Not trying to be argumentative, just trying to help you with your design process.
If you're relying on 1 mF of electrolytic capacitance to clean up a noisy supply on a low-voltage design, something isn't right. If you're relying on 1 mF of electrolytic capacitance (or really any electrolytic cap at all in a non-price sensitive design) to clean up a noisy supply on a low-voltage design, something isn't right. I saw people considering 100 mVp-p noise and ripple to be good, but I am definitely disagree. if your supply is kinda noisy or you want very little noise\ripple you will need to put some good filtering circuits.
caps exist for a reason, you don't need 1mF all the time but if you are designing a Pi or good LC filter you are going to need some capacitance there. It also depends on your standards, like how much ripple and noise can you tolerate. unless you designed it yourself which is not possible, at least in small designs. You cannot guarantee the input supply, the ac to dc converter. No offense, but if you're designing something like a video converter that needs 1 mF of decoupling, you're doing something wrong. For that you would need ceramics and ferrites. I mean, no one use them to decouple video ICs xD.īut as you said, they are not useful in high frequency.
caps anymore TBH, but I know for a fact they are useful in power supply filtering circuits. I don't have enough data to judge that we don't need elec. bulk capacitance cannot be done without them, how can you add say 1000uF using ceramics? They are good for having a lot of filtering for DC-DC converters especially those with low to mid frequency ripple, combined with inductors and ceramic caps of lower values you will get decent results. caps are still good despite no designer loves them. And spare the poor chump that would otherwise have to recap the PCB in 25 years, lol.Įlec. Unless the device is price sensitive, spend an extra dollar on ceramic caps and one less problem to worry about. There's no good reason, imo., for using electrolytic caps (they're also useless for high frequency decoupling) in a modern low-voltage system. Except that it can last 25 years instead of 20 years or soĪn additional 25% service life is a pretty big deal