If you feel that this is the not the way to derive the equation, Then, please could you derive for me if possible?. Because I have put all my effort and I couldn't able to derive the correct derivation.hi pp,
It looks over complex and wrong, but I will check more closely and post what I find.
[most likely posting tomorrow morning]
E
When I run the circuit without compactor, I got the different results, than compare with the full circuit simulation results. Please can you have look my simulated circuits:hi pp,
I am still not sure if you understand the operation and purpose of a comparator, with hysteresis.
That's why you are having difficulty in deriving the equations.
We can try to work out the problem, if you want to try.?
E
In this circuit, assume initially Vi = 0v and Vref =+1v.
What will the voltage be at Va and Vo.??
Use simple resistive divider calaculations.
View attachment 256712
hi,When I run the circuit without compactor, I got the different results, than compare with the full circuit simulation results. Please can you have look my simulated circuits:
Ok.. Ok..hi,
You will get slightly different results.
I asked in post #46 that you calculate the required results, not use a simulation.
You did say you wanted to derive equations.?
E
As I know this theoretical operation of Comp is:hi
I asked:
In this circuit, assume initially Vi = 0v and Vref =+1v.
What will the voltage be at Va and Vo.??
Your answer:
Va = (10k)/200k)*10V = 0.5V
Vo = (195k)/200k)*10V = 9.75V
Conclusion:
If the Inverting input of the Comp is at +1V, how can the Vo be High at 9.75.???
And if Vo is Low, at close to 0V , how can Va be 0.5V.??
E
hi,But, I realize that somewhere I did the wrong calculation as shown on the post #49. Please correct me.
Why did you use 10V if Vo = 0V and Vin is also at 0V?Ok.. Ok..
Va = (10k)/200k)*10V = 0.5V
I have calculated the Va, as same as the post #31. That's why I got 0.5V at the Va.Why did you use 10V if Vo = 0V and Vin is also at 0V?
Also, can you calculate what Vin is needed to get 1V at the Va node (non-inverting input ) when and the comparator output is at Vo = 0V?
Yes...But I hope that you see your mistake?
Now for this circuit
View attachment 256822
Try to find Vin needed to get 1V (Vref) at Va node. And this will be the threshold voltage (Vth1). Can you do it?
You mean, the above calculations are wrong?.But your job now is to find Vin value that's will give as 1V at Va node when Vo is at GND.
Vin=1.04545VBut your job now is to find Vin value that's will give as 1V at Va node when Vo is at GND.