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When I use op-amps in a single-supply limitation, I usually build a virtual ground with the op-amp. For the simplest case, a buffer consisting of an unbuffered reference voltage, passed through an op-...
pigeon CNC's user avatar
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I am studying a peak current-mode controller, and here is the schematic without slope compensation: Before introducing RSENSE to the design, I understood that if feedback voltage increases, it is ...
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I have come across a circuit (I am not allowed to share it) with an opamp that uses a special output. The opamp's output is loaded with a resistor and has no other connection. It is the current drawn ...
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I saw two types of buck loop transfer function from two sheets, and the difference is the second type didn't consider H(s) from compensation network. Here is the first type, error-amp with ...
hehe's user avatar
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I'm studying loop powered transmitters (the 4-20mA thing), because I need to make one. I've found two different reference design which mostly use the same technique but with some slight difference. ...
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I understand the physical significance of gain and phase margin. However, I would like some clarification regarding the mathematical aspects. Videos such as the following: https://www.youtube.com/...
needbrainscratched's user avatar
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I've modified a previous PI controller of a design team on that is working on high speed motor applications to include the D, which didn't solve this issue. The PID loop takes actual speed, and ...
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i found this in the text book. i solved by: 1- found the closed loop function of just the part of B(p) and its "feedback", let's call it B'(p). 2- after that i did H(p) = A(p) / ( 1 + A(p) * ...
oussama ghrib's user avatar
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Using an operational amplifier as a comparator was asked quite a lot times here, but how does it behave the way around? I've a really cheap one in my circuit with low hysteresis and a MOSFETt push/...
Florian's user avatar
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I'm looking at the following circuit and I don't know how to find the gain of the constant gain block. The only information I'm given are the Bode plots (magnitude and phase) of the two transfer ...
EErocks's user avatar
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I have been developing a simulation of the field oriented control of the three phase induction motor. The simulation is developed in the Scilab/Xcos (v5.5.2) which is a free of charge Matlab/Simulink ...
Steve's user avatar
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𝑍(𝑠)= (1+𝑠.𝐶2.𝑅2)/(𝑠.(𝐴3.𝑠^3+𝐴2.𝑠^2+𝐴1.𝑠+𝐴0) C2 = 0.0000001F R2 = 1000 Ohm A0 = 0.000000106034 A1 = 1.27859848E-12 A2 = 4.5011166848E-18 A3 = 4.31278848E-24 G(𝑠)= (𝐾𝑝𝑑.𝐾𝑣𝑐𝑜.𝑍(𝑠...
Joe's user avatar
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I will start with that, i already ask for this question in other topic but i didn't have any anwser about my question link. Please don't go too far in explaning difficult thing not realated with my ...
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I am doing math for a closed loop equation. I know the transfer function for a closed loop system is: (Image copied from "Loop Gain and its Effect on Analog Control Systems" by Gabino ...
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it is known that the stability of a system with negative feedback may be analyzed through the Nyquist stability criterion, which is based on observing the number of turns around the point (-1;0) in ...
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I would like to better understand how a PFC controller works, especially PFC which work in CCM mode. I found the following documentation from International Rectifier: https://www.infineon.com/dgdl/an-...
Jess's user avatar
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Which transfer function ,open loop or close loop do we use/need as a pre req to perform root locus analysis? I have also attached a snapshot of the relevant webpage of university of Michigan. I have ...
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I developed a PID autotuning algorithm that I want to test outside of a simulation environment. For this purpose, I got temperature sensors to send data to a RaspberryPi. Now I need something to ...
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I'm currently trying to understand the function of a loop filter. But where I'm stuck is that I know the output of the charge pump is a series of current pulses whose width is proportional to the ...
user1505399's user avatar
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I am trying to understand the feedback compensation techniques of DC-DC Buck converters. And I drift to more and more small questions which make me want to understand the basics of poles/zeroes/...
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I am trying to understand the physical meaning of poles and zeros of a transfer function. Can someone help me how to understand the Figure 2b in the link below? What does the height of the cone ...
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I have a buck converter. TPS54260 Vin = 7V-20V Vout = 5V Iload=600mA. I realise that there is a similar question in this forum but I was not able to get clarity. I want to understand what do you ...
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I have a actuator capable of measuring motor current and position via an encoder on the output shaft. The motor is a brushed DC motor running through a gearbox. My questions is in regards to the use ...
Paul Phillips's user avatar
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We have an RLC series circuit with sinusoidal voltage source of frequency \$\omega\$. The normal transfer function of current to voltage is: $$ G(s) = \frac{I(s)}{V(s)} = \frac{1}{R+s L+ \frac{1}{s C}}...
dante's user avatar
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I'm want to use ADIsimPll to calculate the loop filter properties for a PLL I want to build. I read some things in the programs help topics which I find somehow strange. Maybe you guys can help me out ...
user2224350's user avatar
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Sometime ago, I came across some theory saying that in a control loop any transfer functions such as ...
emnha's user avatar
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I am creating a simple control loop for a safety door for a machine. When the door is opened, the machine turns off. When its closed, the machine can operate. The way I have it set up now is that we ...
Cheeseman's user avatar
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I have a design that is a offline, single stage flyback, powering two different LED strings. The output of this converter is about 50W and the output voltage can range from 20V-45V. I'm using ST ...
flettz's user avatar
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I am trying to figure out what would be the closed loop transfer function of the LT1619 controller. This is the first step I want to make in order to design the feedback loop. What I already know ...
Daniel Tork's user avatar
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This question is related to a question asked earlier regarding a linear power supply build. It turns out that the circuit is oscillating quite badly; an issue not uncommon in feedback circuits. I've ...
Buck8pe's user avatar
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I have the transfer function below: $$T_c(s) = \frac{s+k_i}{m_0s^3+s+k_i}$$ It is assumed that \$k_p=1\$ and \$k_d=0\$. I am given that \$x_l(t)=[x_l(t),y_l(t)]^T\$ is the trajectory and the ...
Abdalah El-Barrad's user avatar
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If I have a control loop with positive feedback, the closed loop transfer function expression is: $$\frac{Y(s)}{X(s)} = \frac{P(s)}{1-P(s)H(s)} $$ where \$P(s)\$ is the direct loop transfer function ...
diegobatt's user avatar
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Eberhardt Rechtin and Richard Jaffe (both involved in NASAs DSN) published this paper (paywalled) on PLL-design and -performance back in 1955. It is referenced quite often, so I wanted to understand ...
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I have a fully digital implementation of a PLL. The problem that I have is the white noise coming from the PFD (you can view it as input jitter). I would like to filter it a lot, but an implementation ...
afaik86's user avatar
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3 answers
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simulate this circuit – Schematic created using CircuitLab Vout = Vin (1 + R2/R1) According to this positive feedback topology - made an error here, it's Vout = Vin(-R2/R1) (edit) Now I read ...
Ambareesh Sr Ja's user avatar
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Link to circuit schematic simulation The circuit is from the above link. There is some problem with the control loop. The output voltage doesnt stay constant within the input range of 12-24v for ...
Mounika Reddy Vanga's user avatar
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1 vote
1 answer
670 views

How is the loop bandwidth of a PLL calculated? Is it the area under the Transfer Function vs. Frequency plot?
JAHNAVI's user avatar
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7 votes
1 answer
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I am trying to design loop compensation with type-3 error amplifier for a buck converter. I'm a student and very inexperienced in this subject. Please bear with me. Here is the general procedure ...
JGalt's user avatar
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2 votes
2 answers
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I have a question about a probably easy task, but I can't find the right K. I have the loop with an adjustable gain element given: $$Q(z) = \frac{H(z)}{1+ K\cdot G(z)H(z)} $$ I have given: $$H(z) ...
JavaForStarters's user avatar
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2 votes
2 answers
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I've implemented a circuit under a suggestion which solves stability issues when driving a MOSFET with an high capacitance, using an OpAmp. Now, the circuit suggested is this one, in which is modeled ...
thexeno's user avatar
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9 votes
4 answers
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I am running an experiment where I need to rotate a lightweight dial (<5 grams, so very low torque requirement, and fairly slowly), but need to do very accurate, fine steps of 0.03 degrees. ...
boardbite's user avatar
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I wrote a software which replaces a discrete closed loop PI control circuit and now I was wondering what kind of control system is this equivalent to? This code drives the PWM which regulates the R_DS,...
JavaForStarters's user avatar
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1 answer
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I'm working on MCU programmable bench power supply. Its range is 0-50V and 0-3A programmed in 10mV and 10mA increments. It will be published as open hardware and source code that anyone can use it if ...
prasimix's user avatar
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3 answers
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When using step response to a feedback loop with disturbance. Why do we analyze the step response of the disturbance D and the step response of the input R separately. Instead of considering them ...
user43709's user avatar
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1 vote
1 answer
782 views

I am facing trouble with glowing multiple LED simultaneously on a 18f4550 micro-controller under the same " while(1) ". I am new programming. [C18 compiler with Mplab ide.] I was able to alternate ...
Sanju's user avatar
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3 votes
2 answers
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I have a slight confusion in how the feedback pin works. The "\$V_{ref} \times (1 + R_1 / R_2)\$" seems like a shortcut to me, and I have trouble understanding how to feed a voltage in to it, to say ...
Sasha's user avatar
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4 answers
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In Electronics A2 (GCE), we are currently studying voltage regulators. An example voltage regulator circuit is provided using an op-amp and a power MOSFET. I would judge this to be a voltage follower....
Thomas O's user avatar
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