3 ms·
If you use extremely low leakage switches and capacitors, this technique can be used to add and subtract voltages at very high precision: https://www.analog.com
by cellularmitosis 6y ago
If you use extremely low leakage switches and capacitors, this technique can be used to add and subtract voltages at very high precision: https://www.analog.com/media/en/technical-documentation/data-sheets/1043fa.pdf https://www.analog.com/media/en/technical-documentation/data...
- peter_d_sherman 6y agoA capacitor adder, or rather, accumulator! And analog too, not digital! I love it! Just don't load this accumulator with $FFFFFFFFFFFFFFFF -- as that will generate a voltage so high it will fry the whole system! <g> No, I'm just kidding! (That was just an attempt at humor! <g>) On a serious note -- I think the idea is both fasinating and meritorious!
- tails4e 6y agoCapacitative adding and subtracting is how many ADC (analog to digital converter) and DAC (digital to analog converter) chips work. There are many architectures, but capacitor arrays that are binary weighted are common, by switching them you can create or modify a voltage for a DAC, or use this to zero in/match this to the ADC input value. A common architecture that does this is called SAR ADC [0], which basically uses a DAC as part of the ADC, and it is often a capacitive DAC. [0] https://en.m.wikipedia.org/wiki/Successive-approximation_ADC https://en.m.wikipedia.org/wiki/Successive-approximation_ADC