Timeline for Adding hysteresis to a window comparator
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Jan 11, 2017 at 9:11 | comment | added | rioraxe | The thevenin equivalent for (R3 and R4) is R3||R4 = 1/(1/R3+1/R4) = 878. When combined with the 100K fb resistor gives a hyteresis ratio of around 0.0087 or 43mV when multiplied by 5V swing for U2. So if you want the same hysteresis ratio for U1, use a 878 resistor between Vin and U1 + pin. | |
| Jan 11, 2017 at 4:56 | comment | added | Brad Thiel | rioraxe, when you connect Vin directly to - pin of U2, and Vin through a resistor to + pin of U1....does the value of the Vin resistor stay the same as in your original response (R3||R4). Could you also share the equations used to find that Vin resistor value? | |
| Oct 29, 2016 at 1:51 | history | edited | rioraxe | CC BY-SA 3.0 |
Add how to compensate
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| Oct 28, 2016 at 22:58 | comment | added | Brad Thiel | How do you compensate for the fact that U2 is essentially receiving both positive (R13) and negative (R14) feedback at the same time? | |
| Oct 28, 2016 at 22:14 | history | edited | rioraxe | CC BY-SA 3.0 |
fix wrong calculated value
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| Oct 28, 2016 at 12:50 | comment | added | D.A.S. | Of course Rsource=~0, then Rs/(Rs+Rf) = 0% of output= Hysteresis | |
| Oct 28, 2016 at 5:56 | history | answered | rioraxe | CC BY-SA 3.0 |