Find v1 and v2 of a summing amplifier when it is in series with another Op-Amp
There is a summing amplifier with two AC power sources (v1+v2,) each connected to a different Ground. Each of these sources connect to a resistor (R1+R2,) and then to a summing point, which branches...
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What kind of filter/filters are being used in this feedback loop?
simulate this circuit – Schematic created using CircuitLab I am having trouble understanding the feedback loop for this gain stage for a guitar distortion pedal. I am completely new to electronics. I...
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How does the output voltage of an Op-Amp swing to keep the inverting terminal...
simulate this circuit – Schematic created using CircuitLab Vout should be -10 volts according to the voltage gain equation of inverting amplifier which is based on the rule of op amp that A is at zero...
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Current controller: how to dampen resonance to increase bandwidth?
I need to design a +/-1.5A, 3kHz small-signal-bandwidth (absolute min, for 3° max phase and 1% max error on amplitude) current controller for a 20 Ohm 0.1H load with a +/-100V supply rail (the current...
View ArticleHow does a Miller cap physically create a pole in circuits?
If we consider a single NMOS transistor (with its source terminal grounded) and a Miller cap (C) between its input (gate) and output (drain) nodes, circuit theory says that this Miller cap will be...
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Capacitor into resistor to ground
I recently started learning electronics on my own due to interest in audio effects because I play guitar so: I thought I'd start out with distortion pedals, they seemed the simplest to begin with. The...
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How is this circuit providing solution of the differential equation d^2...
Book pages at https://books.google.co.in/books?id=d-7owi6uNtMC What I see is that they have taken d^2 v/dt^2 as an input at point A, integrated it to get dv/dt, integrated it again to get v=2sin3t V,...
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Opamp with multiple feedback loops
I have been trying to figure out how the following circuit works and what it might be good for without any luck so far. What might the transfer function be? Is there a way that analysis can be applied...
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Explanation on why there is no feedback in the circuit for higher voltages of...
simulate this circuit – Schematic created using CircuitLab I don't understand the reasoning behind the analysis of this circuit. The professor started by saying that if diodes D2 and D5 are ON and D4...
View ArticleFeedback Circuit schematic to Control Theory block diagram?
I'm studying analog electronics circuit with feedback. I see that, during analysis, a useful abstraction over the schematic is the block diagram in control theory style, but I stuggle in deriving it...
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Unity Gain Buffer Initial Conditions
simulate this circuit – Schematic created using CircuitLab A typical way of analysing the unity gain buffer is: Where A is Open Loop Gain Vout = A(Vin - Vp) and Vp = Vout therefore Vout = A(Vin -...
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Second order differential equation implementation using OP-Amp
I am trying to implementat the following equation \begin{equation} x''+4x'+25=\sin(20t+36) \end{equation}using OP-Amp's. I tried to use state-space technique to implement it in the below circuitx is...
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What is the definition of "the loading of feedback network on the...
There is the following example:simulate this circuit– Schematic created using CircuitLabIts loading of the feedback network on the input side is 40kohm in series. Its loading of feedback network on the...
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Positive feedback loop in the Wien oscillator
Let's say you got this circuit given which works as a Wien oscillator. To my understanding here Ri is the negative feedback loop and the total impedance of R3 & R4 & L2 & R1 are the...
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Op-amp feedback and stability
I have 2 questions related to this circuit.1The first question concerns the open-loop gain. I am tasked with finding both the open-loop and closed-loop gain. The closed-loop gain is calculated using...
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Calculating the feedback factor of the inverting amplifier?
In the feedback chapater of the Razavi book, he introduces another way to calculate the DC transfer gain of amplifiers in feedback loop.This is given by \$\frac{V_{\mathrm{out}}}{V_{\mathrm{in}}} =...
View ArticleStability test for Feedback Amplifiers
Does the following simple test deduced from Nyquist criterion also apply to positive feedback case or it needs to be modified?If magnitude of loop gain i.e. |T (jω)| > 1 at the frequency where...
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