- #1
KrNx2Oh7
- 19
- 0
So this is the op amp I am looking at and I have a few questions, not entirely sure how to ask them, but I'll ask more as I find out more
http://postimage.org/image/i228xrkj7/
http://postimage.org/image/i228xrkj7/
So the capacitor C1 and C3 are used to block DC, but when you add these do you not
get voltage drops in the AC signal? Like when the op amp outputs a voltage does it not drop some voltage across the capacitor before it reaches Vout.
My second question is over C2. Apparently it is suppose to eliminate power-supply noise from reachin ghte op amps noninverting input. I don't see how this works. How does a capacitor in parallel with R4 stop noise, a non-DC signal?
Finally my last question, which might sound silly, but why do capacitors not end up in the Gain. Instead of Gain= -R2/R1, why don't you do the current equations and include -jwC in the transfer function to have capacitors show up in the gain.
silly questions, but I want to know why everything is in this configuration and why it works
thanks
http://postimage.org/image/i228xrkj7/
http://postimage.org/image/i228xrkj7/
So the capacitor C1 and C3 are used to block DC, but when you add these do you not
get voltage drops in the AC signal? Like when the op amp outputs a voltage does it not drop some voltage across the capacitor before it reaches Vout.
My second question is over C2. Apparently it is suppose to eliminate power-supply noise from reachin ghte op amps noninverting input. I don't see how this works. How does a capacitor in parallel with R4 stop noise, a non-DC signal?
Finally my last question, which might sound silly, but why do capacitors not end up in the Gain. Instead of Gain= -R2/R1, why don't you do the current equations and include -jwC in the transfer function to have capacitors show up in the gain.
silly questions, but I want to know why everything is in this configuration and why it works
thanks
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