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TidtTim
modified 9 years ago

Three Bit A2D Converter

1
21
166
02:06:42
Demonstration of a 3 bit Analog to Digital converter. Today's FETs are near ideal switches, so this circuit would be practical. Each additional bit introduces another comparator delay, so the frequency response decreases as the number of bits increases. The 2.67k and 6.12k resistor values are NOT correct. What ARE the correct values? I added LEDs to make it more apparent that all 8 bit combinations are happening.
published 9 years ago
2ctiby
9 years ago
Is it something like this which you are looking for? http://everycircuit.com/circuit/5335862560948224
hurz
9 years ago
This looks more like a 2bit ADC. Here a different old implementation http://everycircuit.com/circuit/6654345580118016
2ctiby
9 years ago
I like the look of the Hurz model here for audio frequencies and less than 100kHz, but if we are looking to use this at say 1MHz say for analytical usage then we need to look at one single wave at 1MHz to see how things are holding out...look at the three models above (original, Hurz and mine) at that frequency of 1MHz and see how one wave is performing in each case....not a competition...just interest as described.
hurz
9 years ago
http://everycircuit.com/circuit/6163208587182080
2ctiby
9 years ago
@hurtz That's nice, and a lot simpler too..... My point was really demonstrating that the improvement lay with the mosfet settings rather than his proposed resistor alterations. Your demonstration is even better in that we may not need any mosfets. We could do with feedback from TidtTim to see what he is after.
TidtTim
9 years ago
The FETs are not necessary IF the output of the comparator swings all the way to the rails. A lot of components (the CMOS ones) can do that.
2ctiby
9 years ago
So then if you really want to stick with those mosfets perhaps this is what you want.... http://everycircuit.com/circuit/6627825331470336
hurz
9 years ago
@2cent, your mosfet setup is completly unrealistic and wont be good for anything. Why not use a relay instead?
2ctiby
9 years ago
You are wrong Hurz...My schematic looked fine here for Mosfet action, albeit the Mosfet settings needed adjusting to conform to real ones. It takes time to alter those and it is not my project here to do so. I pointed that out if you had bothered to read my description properly. Anyway I have made the alterations now...so it is all up and running fine..... Further adjusted....No shoot-through, lower Nmos set to 0.05Ω Rds₍ₒₙ₎ and upper Pmos set to 0.5Ω Rds₍ₒₙ₎ Lower VTO set to 4V , upper VTO set to -4V ...these settings match many standard Mosfets and show the LEDs working satisfactorily just the same as before....So altering further was not really necessary, it was just a time consuming technicality as far as my EC mosfet description is concerned.
2ctiby
9 years ago
@Hurz ... Notice on your first reply above with an alternative schematic, I gave you good praise rather than pick on ridiculous technicalities....such as your inappropriate Rds₍ₒₙ₎ and over 100A current with your 5V http://everycircuit.com/circuit/5226617265979392 LOL
hurz
9 years ago
I made the ADC rediculous low ohmig for your rediculous comment about ADCs speed. That was for fun. Here is your childish mosfet model you propagate for some time now to contradict the use of a circuit simulator http://everycircuit.com/circuit/5068741364940800
2ctiby
9 years ago
Hurz, I have spent a year of your nonsense arguing. Like TheBugger and almost eveyone else here, I have no intention of starting a new year continuing in that mode. I am just going to ignore all that you say...go find yourself some new whipping boys to admire you.
hurz
9 years ago
I dont write this for you idiot. Its only to inform the community about your messy bullshit. Dont read and dont dont answere it. Keep up your messy engineering!
hurz
9 years ago
BTW, i m not the first one who informed the community about your bullshit mosfet models.
2ctiby
9 years ago
@everyoneapartfromhurz...view my Mosfet help schematics and view the oscilloscope whilst making the suggested alterations there. You can then see how things alter as described and judge validity for yourself rather than accepting a wild unsubstantiated statement from Hurz. Just ask if you need help with Rds₍ₒₙ₎ etc...Don't be put off by knowall Hurz who always tries to destroy what you do whilst making himself look great....Have a go at using Mosfets...many others will help you...not like Hurz who only critisises without valid useful points....See also his lack of correct Rds₍ₒₙ₎ and poor Mosfet settings in his recent reply to others...eg http://everycircuit.com/circuit/5173609870131200
hurz
9 years ago
Anything to tell us about your 'relay model'? Anything you have to say here? http://everycircuit.com/circuit/4569825414479872 i guess not. Keep up messing!
2ctiby
9 years ago
@Hurz ... In your @agentaero reply, the little spikes on your load output highlight the mosfet timings problem that you created. It was pointless pretending that they were there on purpose with a decimation design. Sure they can be filtered out by speakers etc but the problems you introduced show, and your amount of short-circuit shoot-through is subsequently a poor result. http://everycircuit.com/circuit/4823252761575424
Robert_Kidd
9 years ago
@Hurz, aka Werner, give everyone a Christmas present - stop your bullying!
2ctiby
9 years ago
Hi Robert, I really don't fancy starting a whole new year of anger etc with Hurz. I have tried for a year to get him to be fair and reasonable but there is no change...My new ploy is to now completely ignore him until if and when he re-starts with a new attitude with much apologies from him....we may have a long wait.
Robert_Kidd
9 years ago
Hi! I've just deleted my partly written reply as Werner isn't worth the time it took me to write it. He won't change for a very simple reason - he doesn't want to! Seasons greetings to you and all EC members :-)
hurz
9 years ago
You both are Santa Claus Trolls. Do us all a favour and troll for santa https://www.youtube.com/watch?v=vTR61Epm1Bo&sns=em

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