Hi Friends ,
I tried simulating a schmitt trigger circuit using LM311 comparator in Pspice. And i am not getting proper output. I have attached the schematic and the waveform. I have the following queries. I calculated the Vut and Vlt and they are 12.002997 and 11.97302697 respectively.
1) Why is there a delay in the output switching , when the sine input is exceeding Vut or goes below Vlt. The output should switch to low immediately right?
2) Why is the output not going to negative , when the sine input voltage exceeds Vut?It switches to zero but does not turn negative.
3) There is some pull up resistor connected to 3.3 V at output. I dont know why is that connected. But the output has to be 15 V and -15 V right? But because of the pull up resistor i think the maximum output voltage is only 3.3V. How can be that so?
4) If i remove the pull up resistor , even then the output is not 15 V , 12 V.
Thank you friends.
I tried simulating a schmitt trigger circuit using LM311 comparator in Pspice. And i am not getting proper output. I have attached the schematic and the waveform. I have the following queries. I calculated the Vut and Vlt and they are 12.002997 and 11.97302697 respectively.
1) Why is there a delay in the output switching , when the sine input is exceeding Vut or goes below Vlt. The output should switch to low immediately right?
2) Why is the output not going to negative , when the sine input voltage exceeds Vut?It switches to zero but does not turn negative.
3) There is some pull up resistor connected to 3.3 V at output. I dont know why is that connected. But the output has to be 15 V and -15 V right? But because of the pull up resistor i think the maximum output voltage is only 3.3V. How can be that so?
4) If i remove the pull up resistor , even then the output is not 15 V , 12 V.
Thank you friends.