The discussion focuses on calculating the output voltage (Vo) in relation to the input voltages (V1 and V2) in an ideal operational amplifier (op-amp) circuit. Participants emphasize the importance of applying Kirchhoff's Current Law (KCL) to derive the necessary equations for the op-amp's input and output nodes. The concept of "virtual ground" is highlighted as a critical factor in understanding the voltage relationships in the circuit, particularly when analyzing the voltage between the 100k and 200k resistors. The confusion regarding the zero voltage at the node and its implications for current flow is addressed, clarifying that the presence of negative feedback in the op-amp alters the expected behavior.
PREREQUISITESElectrical engineering students, circuit designers, and anyone working with operational amplifiers and analyzing circuit behavior.
For an ideal opamp with negative feedback, what can you say about the voltage difference between the + and - inputs?haha1234 said:Homework Statement
The problem is upload below.
Homework Equations
The Attempt at a Solution
I was stuck at finding the voltage between the 100k resistor and 200k resistor.
Is the voltage zero since the node below there is zero and there is no resistor between them?
But if the node voltage is zero,there will be no current going through that path which I think is quite strange...
haha1234 said:
![2015-11-20_23.47.37[1].jpg](/data/attachments/75/75208-36928ebd13b8ebd17a7b504d886cadf8.jpg?hash=NpKOvRO469)