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ha, ya you're right. ok, revised. still, not convinced this will work.. also there's a reason i can not use the op-amp you selected, i need a single line out to the +/-50V. is strange, i know.
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anywho.. charge pump it is :)
esp1, its a 2 op-amp IA so its a bit different.
FvM - putting the reference on the divider worked, thanks! the resulting circuit has somehow a 50mV offset on the output, not sure where this is coming from.
I suppose I could use a 2.5V REF chip from analog devices for this?
feels super akward...
single supply 2 op-amp instrument amplifier with bi-polar input, is this possible? i keep reading that it is, then i simulate it and doesn't work. my input is +/- 50V, so that might be part of the issue.
agreed about doing the design first and then see what chip you need. i have no limit to space so its OK this approach. i'm just learning a bit about the parts and stuff. for cost reason and also cause i'm totally new, i don't want to do this in an FPGA. the reason i am quickly trying to...
to get the 20ns resolution, can i use internal CPLD clock divider to get the 20ns clock i want? so, i could use an external 10MHz oscillator and then internal clock divider of 5?
just incase this is important, i picked CPLD instead of say a microcontroller because of the 20ns measuring requirement and high noise environment. i just assume microcontroller can not perform well in that area. seems like the CPLD i need is also cheaper than low cost MCU so that is a small...
i think my original description was not accurate. i have a signal coming in on an I/O when this pin transitions high, counter starts. and it continues counting until some other I/O pin transitions high. repeat this 10 times. etc. etc.
20ns resolution is fine for me so i was thinking 100MHz...
your transformer has lost its isolation property because primary & secondary share same ground. this might not be a big deal, but i see you go out of your way for the transformer so i point this out.
i am very n00b when it comes to CPLDs so i do not know if it can do this or not.
-can CPLD measure a pulse width, remember how many nanoseconds it was?
repeat this say 10 times and remember the value for each one.
- determine which pulse was the longest
- determine how much shorter each...
check with manufacturers planned obsolescence schedule. that chip will be used in high volume right up to the day it goes obsolete. it was too popular so now its used a lot and nobody will re-design their product to use some other until that thing goes obsolete.
before jumping to exotic control you should first determine if its actually needed. the beauty of PI control is that it is easy to understand, easy to implement, and the best part easy to prove stability over the applied range of use.
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