I wanna check my answer with you guys .. and also need help .
View attachment New.pdf
View attachment New.pdf
6a) Your graph is close to correct, but the voltage where it switches from low to high is incorrect.
6b i) correct!
6b ii) Think about an ideal op-amp how much current is flowing into the input pin? Consider the input pin of an ideal op-amp has infinite impedance.
6b iii) Close, but incorrect, remember the voltage on the inverting input is the same as the voltage on the non-inverting input. Also remember to divide by 20k not 20.
6b iv) If you figure out the 6b ii) and 6b iii) then using KCL the answer should come to you.
6b v) Close again, but remember the voltage on the inverting input is the same as the voltage on the non-inverting input.
6b vi) Repeat all of the 6b questions with the new parameters and you will have your answer.
6a) Your graph is close to correct, but the voltage where it switches from low to high is incorrect.
6b i) correct!
6b ii) Think about an ideal op-amp how much current is flowing into the input pin? Consider the input pin of an ideal op-amp has infinite impedance.
6b iii) Close, but incorrect, remember the voltage on the inverting input is the same as the voltage on the non-inverting input. Also remember to divide by 20k not 20.
6b iv) If you figure out the 6b ii) and 6b iii) then using KCL the answer should come to you.
6b v) Close again, but remember the voltage on the inverting input is the same as the voltage on the non-inverting input.
6b vi) Repeat all of the 6b questions with the new parameters and you will have your answer.
Then this is what you need to be focusing on -- strengthing your understanding of opamp and why we can analyze opamp-based circuits the way we typically do.Ok ..
I dont get what are you trying to say on 6b i, ii, iii..
Can you please explain more !!!
Because this is my weakest area in electronics.
I dont get anything at all in Op Amp
Ans. 1 --> 0 VThen this is what you need to be focusing on -- strengthing your understanding of opamp and why we can analyze opamp-based circuits the way we typically do.
An opamp is a device in which Vout = A(Vp - Vn) where Vp is the voltage at the non-inverting input and Vn is the voltage at the inverting input. The coefficient A is the voltage gain is an typically 100,000 or more (sometimes 10 million or more). So let's call it A=1million for sake of discussion.
An opamp (generally not even an ideal opamp) can't put out a voltage that lies outside of its supplies. So Voutmax = +15V and Voutmin = -15V (in the case of the circuits in your problems).
Q1) What is the difference between Vp and Vn just as the output reaches +15V?
Q2) What is the difference between Vp and Vn just as the output reaches -15V?
Q3) If the voltage at the inverting input is 3V, what is the voltage at Vp just as the output reaches -15V?
Q4) If the voltage at the inverting input is 3V, what is the voltage at Vp just as the output reaches +15V?
Q5) What does the graph in Problem 6a look like, taking all of the above into account?
difference has to be million / 15 right?If we use infinite gain, but I specifically stipulated a gain of one million.
What does the difference have to be such that, with a gain of one million, the output will be +15V.
Don't just guess at an answer and ask if your guess is right -- show some work.
Is this a guess or do you have a reason for saying this?difference has to be million / 15 right?
Vout = A(Vp - Vn)Is this a guess or do you have a reason for saying this?
When WBahn comes back on-line he will tell you to check your units - then you will see why "million / 15" is not right. I am just saving WBahn the trouble!
Twould appeat that my reputation precedeth me!Is this a guess or do you have a reason for saying this?
When WBahn comes back on-line he will tell you to check your units - then you will see why "million / 15" is not right. I am just saving WBahn the trouble!
Vout = A(Vp-Vn)Vout = A(Vp - Vn)
So a = 1 mil. Vout = 15 so
15/ 1 million to get difference between Vp and Vn
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