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1answer
60 views

What is the purpose of the capacitor in this circuit?

Is the purpose of the capacitor, C1, to filter out any possible DC component that the input signal has?
1
vote
2answers
181 views

What is the difference between these two op-amp circuits?

I don't understand why when we design a proportional amplifier, the feedback has to be negative. When I run the simulation in simulink I get the same result for both circuits.
0
votes
1answer
90 views

How do integrator circuits serve as memory devices in continuous time system?

I didn't understand the yellow-marked sentence clearly, and even I did, what does it have to do with the conclusion that follows it? (marked in green). Thanks in advance.. Source: Modern control ...
0
votes
1answer
88 views

Calculating the transfer function of this op-amp circuit

The first op-amp is a differential, second one is a follower and third one is a second order low pass filter. I've been struggling with the low pass and the final output of the circuit and I am not ...
1
vote
2answers
352 views

Finding the transfer function of an non-inverting audio op-amp

I am just doing some independent re-search for myself in audio amplifier (CHIP AMPS) such as the LM1875. I want to learn more about how to compensate for audio chip amps and how their bode plot ...
0
votes
0answers
354 views

PI Controller with XLSEMI4016 Buck Converter, unstable VFB seen

I have the following circuit set up to control VOUT (labelled SENSE on my Excel test results). Note that the node between REXT, POT, and R_B is called VFB. It goes to the FB pin of the XL4016 chip, ...
3
votes
3answers
288 views

Offsetting a differential amplifier to remove the need for a dual supply

I'm developing two similar circuits that will enable me to differentiate the X and Y coordinates from a segmented photo-diode (Four segments). These coordinates will be dependent upon the position of ...
1
vote
1answer
136 views

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 ...
0
votes
1answer
141 views

Simple current regulator transfer function

I did simple op amp MOSFET current source. It was not working correctly, it had oscillations as per picture, so RC circuit was was added and problem was resolved. What I am wondering is transfer ...
-1
votes
3answers
291 views

Transistor current control with positive feedback differential amplifier

Hi Folks, I want to analyse the functionality of following OpAmp configuration which seems to be employed as voltage - current conversion. Positive feedback (This is not a Failure and is ...
3
votes
2answers
804 views

Finding transfer function of a compensator circuit similar to a type 2 compensator topology

I know how to find transfer functions of op-amp circuits using equations derived from using Kirchhoff's current law (nodal analysis), and normally I don't have any problems solving them. However, I ...
23
votes
6answers
6k views

What is noise gain, really? And how is it determined in the general case?

UPDATE: This question triggered what might fairly be called a research obsession for me. I've gotten pretty close to the bottom of it I think, I've posted my findings as an answer below. There was a ...
3
votes
4answers
394 views

Control theory diagram for feedback circuit with compensation

An op-amp that drives a secondary gain stage might be given like this: simulate this circuit – Schematic created using CircuitLab Where it is important to note that FB1 is some impedence (...
2
votes
0answers
659 views

Deriving PI controller transfer function when input is reversed

I'm developing the compensator for the linear DC Bench Power Supply I'm designing. As I've come to deriving the transfer function for the op amp-based compensator, I realize I've been depending on a ...
3
votes
2answers
2k views

Is a Type 2a PID(ish) controller just an example of an augmenting integrator?

In a previous question I finally cracked the code on deriving for myself the transfer function for a Type 2(a) compensator like this one, built around an op amp. As it turns out, for AC analysis ...
6
votes
2answers
507 views

What is this RC local feedback configuration?

I'm studying power converter control loops using Christophe Basso's book Designing Control Loops for Linear and Switching Power Supplies. A very common pattern in the compensator circuits is a ...
-3
votes
2answers
107 views

regulator ac to dc with

I am studying for my EE exam ,I understand the general working of the circuit but there is some details about it I have to know. this regulator supply 24 volt with puissance nominale 200watt. it ...
2
votes
2answers
204 views

What is the correct transfer function of a feedback loop if the summing amplifier has different input resistors?

Suppose I have a circuit below: simulate this circuit – Schematic created using CircuitLab I know the the transfer function of a negative feedback loop is: $$H(s)=\frac{H_1(s)}{1+H_1(s)H_2(s)}...
0
votes
2answers
158 views

Control system to minimize a parameter [duplicate]

This is a pretty vague question so please bear with me. I can add further information if required; just let me know in the comments. So here is the problem that I want to solve. There is a system ...