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Op amp analysis: when are the "negative feedback rules" applicable?
When we build op amp circuits that use negative feedback, like so: ... we can analyze the circuit very easily, by assuming that $$v^- = v^+$$ due to negative feedback (when also assuming the op amp is...
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Audio FET Buffers and Negative Feedback
I am struggling to come to term with how negative feedback helps widen the scope of input signals coming into FETs (or OpAmps for that matter, but I am using J201 JFETs). I am aware that the largest...
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Feedback in hybrid power supply
During my research of PSU I came across schematic from Linear's datasheet: 1) Whats the purpose of node which is going from output to SW pin of buck converter? 2) Is node which provides 6V headroom...
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How does this Push-Pull amplifier work?
I'm reading about op-amp circuits that use negative feedback from this article (question no.19). What confuses me is that the negative feedback for the Op-amp (which is being used to reduce cross-over...
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Stability and loop gain of negative feedback systems
When we look for stability of a feedback system, why do we only concentrate where loop gain is unity and check the phase margin there. The phase of the closed loop system might be passing through 180...
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Inverting Op-Amp Circuit Problem
I am trying solve the question shown in the picture below (I am assuming the switch is down in the picture, I can't tell) The equation that I am using is Vout/Vin = - Rf/Rin because there is negative...
View ArticleHow does using negative feedback in biasing stabilize the beta of a BJT?
As far as I know the only reason beta is not reliable because it is temperature dependent. I have seen some diagrams about biasing to obtain stable beta. I read the negative feedback provides this but...
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Input stage of a current mirror circuit
I'm trying to understand current mirror circuits and I've been reading this article. I'm unable to understand the input part of the circuit where the author says "Producing the opposite where the...
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Operational amplifier and negative feedback
Let's consider an op-amp. In every book I've read till now, it is said that if we have: negative feedback finite output then we have: Vout = A * (v2 - v1) --> (v2 - v1) = Vout / A If A is very very...
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Op amp with feedback
simulate this circuit – Schematic created using CircuitLab How to calculate Iout(current flowing through RL) of this circuit? All Resistors are of same value except the load resistor. Let the rail...
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Designing two stage CE amplifier with negative feedback [closed]
I'm trying to design two stage ce amplifier with negative feedback using 2n2222 transistors. The circuit must have certain voltage gain, Rin, Rout, Vcc, low and high frequency filter. This is the...
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