MRFGUY
Full Member level 1
Hello all,
If somebody can help me for the follwoing problems:
My design is:
A Phototransistor generates negative pluse and I try to amplified by using opamp. I just wonder is it possible to fed directly like this current to opamp.
I attached the orcad design. I got this design from one website (JPG file) and I try to simulate in orcad.
My Questions are:
1. I just try to use current pulse to generate the like phototransistor output. I am not sure is it correct or not.
2. I can't simulate with longer run time. it will show "Convergence problems" How can I solve this.
3. I can't simulate with TL074CN in my design. If I use this I got error msg.
4. Why do we need to use 2 opamps instead of using one. During simulation I saw no differences between 1st opamp and 2opamp.
5. Why do we need to use C3 (instead of using only Resistor connect to non-inverting input and just grounded) and C4.
Thanks alot.
If somebody can help me for the follwoing problems:
My design is:
A Phototransistor generates negative pluse and I try to amplified by using opamp. I just wonder is it possible to fed directly like this current to opamp.
I attached the orcad design. I got this design from one website (JPG file) and I try to simulate in orcad.
My Questions are:
1. I just try to use current pulse to generate the like phototransistor output. I am not sure is it correct or not.
2. I can't simulate with longer run time. it will show "Convergence problems" How can I solve this.
3. I can't simulate with TL074CN in my design. If I use this I got error msg.
4. Why do we need to use 2 opamps instead of using one. During simulation I saw no differences between 1st opamp and 2opamp.
5. Why do we need to use C3 (instead of using only Resistor connect to non-inverting input and just grounded) and C4.
Thanks alot.
