Hi all,
I'm trying to design an inverting schmitt trigger for my circuit (see attached file). I managed to design a non-inverting schmitt trigger but becuase of the feedback loop connecting the input I have a feeling it's screwing up the input signal in the rest of the circuit. I know I can use a buffer to isolate the signal but it's generating other problems.. I know that with the inverting configuration the input is isolated from the feedback so I suspect signal won't be affected.
I'm using a LM393 comparator and according to the data sheet a pull-up resistor is needed (they suggest a value of 3k). When I do node voltage analysis I get the equation in the document attached. But when I get my values for my resistors from these equations, my circuit does not work at all! Am I doing something retarded? Please help!
Thanks!
FYI: The threshold voltages for my design are:
Vlower = 0.1V
Vupper = 0.3V
I'm trying to design an inverting schmitt trigger for my circuit (see attached file). I managed to design a non-inverting schmitt trigger but becuase of the feedback loop connecting the input I have a feeling it's screwing up the input signal in the rest of the circuit. I know I can use a buffer to isolate the signal but it's generating other problems.. I know that with the inverting configuration the input is isolated from the feedback so I suspect signal won't be affected.
I'm using a LM393 comparator and according to the data sheet a pull-up resistor is needed (they suggest a value of 3k). When I do node voltage analysis I get the equation in the document attached. But when I get my values for my resistors from these equations, my circuit does not work at all! Am I doing something retarded? Please help!
Thanks!
FYI: The threshold voltages for my design are:
Vlower = 0.1V
Vupper = 0.3V
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