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Questions tagged [compensation]

For questions about designing electronics to account for undesirable characteristics or behaviors, such as frequency compensation in a feedback control system to avoid instability and/or improve gain and phase margin, reduce overshoot and ringing, improve bandwidth, etc. Consider using in conjunction with associated tags such as "feedback", "stability", "frequency-response", "nyquist-plot", "bode-plot", "operational-amplifier", etc., if appropriate.

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7 votes
6 answers
931 views

Help Understanding a signal rectifier

I was reading an electronics book and came upon this circuit. I am having a difficult time understanding why the voltage across D1 is 0.6V. I understand that that the reason is because the input ...
0 votes
1 answer
206 views

How to compensate an op-amp at a particular frequency?

I am trying to design an op-amp but because it is going to be used at a max frequency of 10kHz, I only need to make sure the phase margin is good enough at this frequency. Most of the methods for ...
0 votes
1 answer
207 views

Minimum compensation capacitance for 45 degree phase margin in two-stage CMOS OTA

I'm working through a solved example problem on compensation of a two-stage op amp. For extra context, this example problem is originally from an exam of a now-concluded course offering, so it is ...
0 votes
1 answer
1k views

Designing a lead compensation for a third-order system

Consider the control system shown in Fig. 1. Design a compensator such that the unit-step response curve will exhibit a maximum overshoot of 25% or less and a settling time of 5 sec or less. What I ...
2 votes
1 answer
118 views

Buck-boost output drops when loaded

The LTC3566, a PMIC intended for battery and USB supplied applications, integrates a battery charger, a power path and a buck-boost converter. For my board, I copy-pasted the schematic found on the ...
0 votes
1 answer
136 views

Why are there two different feedbacks in this battery simulator design?

I am trying to understand this LT1970 Battery Simulator Design and I could not figure out what is the point of two different feedback legs in this circuit? I have tried AC analysis but could not get ...
-1 votes
1 answer
143 views

How to measure the 3 dB bandwidth of an opamp in LTSpice

I am interested to use an opamp with an exact 3 dB rolloff at 320 kHz for an sinewave (voltage swing) from -10 to +10 V. I think I need to do this using some resistors and capacitors on the feedback ...
2 votes
2 answers
128 views

Reason to use a current loop in addition to a voltage loop in linear regulators

I recently came across this figure detailing the compensation of the UC3833 in the App Note “A High Performance Linear Regulator For Low Dropout Applications” Available here and they show the use of ...
2 votes
1 answer
138 views

Op amp GBW compensation when used in MFB filter

I've been reading through this app note by TI where its proposed that when using a MFB filter a compensation resistor can be added to overcome limitations of lower GBW op amps. I've been working ...
1 vote
0 answers
65 views

Buck-Boost fault mode on startup and gradual current decrease

I am using the TPS92692 in buck-boost mode with an analog signal to set Iadj and PWM. When I start the circuit, it consistently goes into fault mode and the fault pin is periodically set low. However, ...
2 votes
1 answer
223 views

fast analytical technique identifying poles/zeros using degree of freedom

I encounter some engineers who can quickly spot poles and zeros in the circuit by identifying "degree of freedom". For example, a typical technical discussion goes like : "a miller ...
4 votes
3 answers
550 views

Emitter-coupled logic operation

For the operation of emitter-coupled logic and sedra smith book, 1) Compared to CMOS, why ECL is the faster logic family given that it requires so many transistors to propagate to output Y (T5 ...
0 votes
2 answers
130 views

Analog Compensator Vs digital Compensator in Power electronics Converter

I was working on designing a feedback compensator for my buck converter. I decided to use the compensator circuit in the feedback and give its output to Arduino which gives the duty cycle as shown ...
11 votes
4 answers
3k views

What is the purpose of including (or excluding) the output resistor in the feedback loop of an op-amp buffer?

I have often seen (and made) circuits like this. It is a simple inverting op-amp buffer, plus a small current-limiting output resistor to protect the the op-amp if the output is shorted. simulate ...
0 votes
0 answers
48 views

Feedback compensation on a buck-boost led driver

I tried to calculate the compensation network for a TPS92692 in buck-boost topology and I can't find the same value for the typical buck-boost led driver (page 41 of datasheet). Section 9.2.2.2.12 ...
0 votes
1 answer
931 views

Design of compensator type 2 for current mode control of boost converter

I have designed a boost converter with peak current mode control in PLECS. I have used the method of k factor approach to design the compensator. The Bode plot transfer function of the power stage is ...
0 votes
1 answer
65 views

Movement Sensor circuit

I have this PIR sensor circuit, can someone explain what each of the capacitors do in the circuit?
2 votes
1 answer
163 views

Stability issue: Compensation changes using Bode plot in LTspice

I am encountering issues with a LT8390 design, particularly in higher load current conditions, which leads me to suspect a stability problem. The design parameters are as follows: vin 18-36 (28v ...
1 vote
0 answers
46 views

Thermal EMF on shunts

I tested the accuracy of a shunt resistor of 20 μΩ by applying short pulses of 100 A. At lower current levels near 0, I noticed the sensed current had a variation of ±300 mA. I did some research and ...
1 vote
1 answer
188 views

LTC7803 Buck Converter Current Mode Compensation

I wanted to design a step-down converter using the LTC7803. Goal is to have a 5V, 0-2A output with an input voltage range of 10-30V. Switching frequency is set at 1MHz. As shown in the LTSpice picture ...
2 votes
2 answers
2k views

Three-wire load cell and HX711 weight compensation

In my project I use a 3-wire load cell (like this (3-wire 50kg), but mine were purchased from eBay) and an HX711 for weighing. My wiring is like this (but I use an Arduino Mini Pro 3.3 V): Apparently ...
2 votes
1 answer
348 views

Op-amp - Lead compensator design

I would be very happy if anyone can help me find answer regarding to questions below: The lead compensator is added to the system to increase the phase margin. 1'st picture is related to the ...
0 votes
2 answers
724 views

What is the purpose of compensation resistor in the CMOS Two stage op-amp circuit shown here? And it effect on Unity Gain?

I wonder why there is a compensation resistor in some CMOS Op-Amp circuit shown here. What is the purpose of this? I tried to vary it and this is what I got for unity gain of each value. Based on many ...
4 votes
1 answer
159 views

Output voltage not stable - What is compensation with respect to DC-DC (buck converter)?

EDITS: Input voltage range: 24V to 48V. Changing the load current from 0.38A to 1.018A increases the mean output voltage from 12.779V to 13.26V. The supply should be producing 12.5V. I'm using this ...
5 votes
2 answers
810 views

Flyback power supply instability issue

I have created a switching power supply: Input: 230 V AC Output: 12 V DC, 1 A Controller: UC3844 Topology: flyback Switching frequency: ~ 100 kHz Schematic: When I start this power supply, output ...
4 votes
3 answers
5k views

Controller vs compensator?

Both these terms: controller(forexample PID controller) and compensator(Lead compensator) are often encountered in control systems,but what is difference between these two? Brain douglas in this ...
2 votes
1 answer
302 views

What is the better way to stabilize this discrete op-amp and why?

I have the following simple op-amp circuit, which is meant to drive a MOSFET (M1) gate and work as a voltage regulator. It is discrete for a mix of reasons (necessary bandwidth, using existing BOM ...
3 votes
2 answers
633 views

Buck Converter Compensation and Transient Response

I am trying to compensate a buck converter. I've set up an averaged model of a buck converter in LTSpice. Here is a picture of the simulation. The B3 voltage takes into account the gain from using a 5 ...
2 votes
0 answers
1k views

Average current mode control compensation

This is the structure of average current mode control (source here). Please look at signal \$V_{com}\$ at the positive input of PWM modulator. For proper operation, in steady state the magnitude of ...
0 votes
1 answer
309 views

Why this overshoot in transient?

I am designing a forward converter whose output can be variable from 4V to 30V, 0-5A. This is going to be a pre-regulator for a linear converter. This is the schematic: I am using UC3844 controller ...
1 vote
1 answer
82 views

Current regulation compensation SG3524 and right place to place sense resistor

What is the right place to place current sense resistor? As in picture we get traingular wave n position 1, sine wave with highest amplitude on pos 2, smaller sine wave on pos 3 and nearly flat line ...
1 vote
0 answers
155 views

Battery charger circuit confusion - drive and compensation

I'm building something that is going to have Li-Ion batteries so I'm trying to learn how a battery charger actually works. I've been looking over the datasheets for the BQ2000 and the BQ2954. I will ...
2 votes
1 answer
1k views

TL494 compensation

I am trying to make a homebrew power supply. It works at the moment, but compensation is not done yet. Can someone help me to calculate and select the right poles and zeros? VCM is at error op-amp 1, ...
3 votes
2 answers
333 views

How feedback loop is done in wide voltage range laboratory power supply? TL494 compensation

Hello i would like to ask how is compensation done on switching PSU with wide range variable output voltage (from zero to several hundres of volts). I have succesfuly (I guess) simulate my own design ...
1 vote
0 answers
75 views

Boost PFC compensator design

I'm trying to design a type II compensator for my LT1249 boost PFC stage but I'm not sure on how to place the zero and poles frequencies using a typical error amplifier: I have a working LTspice ...
2 votes
1 answer
289 views

Compensator design for control systems

Currently, I'm working on linear control course from Nise's book. In the root-locus design chapter, some methods were explained for lag and lead compensator design which uses root-locus properties. ...
0 votes
1 answer
716 views

DC-DC converter error amplifier output

I am new to DC-DC converter electronics. I was wondering what the output of the error amplifier/compensator looks like. Is the output of the compensator being driven to the Vref value set on the non-...
2 votes
0 answers
606 views

Trying to perform transient frequency response with LTspice or Microcap, TL494 compensation

I have tried to do Bode plot of my uncompensated plant by myself in LTspice 17.1, but the result looks strange to me. This topic is a follow-on to this one.. I have no clue why it comes with 290 ...
2 votes
1 answer
318 views

Op-amp with compensation has positive feedback with over-unity gain

I am looking at the following figure (Maxim APPLICATION NOTE 5129 Stabilize Your Transimpedance Amplifier): (source: maximintegrated.com) I just can't understand the following: in the region half-way ...
2 votes
0 answers
187 views

AC analysis of SMPS shows instability. How to modify the analysis to reflect the transient stability?

Background I have designed a switch-mode power stage with voltage-mode control that uses an LCLC filter in its output to obtain a very low ripple output voltage. I have empirically arrived at a ...
0 votes
0 answers
140 views

Cancelling optocoupler pole in an isolated voltage mode controlled smps

I am designing a 600W halfbridge converter with a voltage mode controller(TL494). I am using a type 3 compensator with TL431 as shown in the image below: where: The capacitor C2 constitutes the ...
1 vote
1 answer
104 views

DCDC booster oscillation because of small drops of input voltage

I'm stuck with this DCDC booster design that shows a bad oscillation output when a little voltage drop is present at the input. I have already tried to change the inductance to 4.7uH (actually, the ...
1 vote
2 answers
129 views

How to drive 400 nF load with DAC

I need to drive a some kind of pzt transducer with a triangular 6 Vpp voltage. The transducer is modeled as a 400 nF capacitor. I want to drive it with 10 kHz 3-9 V triangular voltage however my DAC ...
0 votes
2 answers
44 views

Double pole, double zero: incorrect plot?

I can't seem to find where I'm going wrong here. Suppose I want a double pole, double zero system that looks like this: $$ \dfrac{\left(1+\dfrac{s}{\omega_z}\right)\left(1+\dfrac{s}{\omega_z}\right)}{\...
0 votes
1 answer
161 views

Controller for boost converter

I'm trying to design a controller for a boost converter by the "shaping loop gain" method as in the Fundamentals of Power Electronics textbook by Ericson and Maksimovic. I see that there is ...
2 votes
1 answer
86 views

Current control loop compensation network

I have an application that uses n-channel Mosfet as a high-side switch controlled by an IC driver. The point of the Mosfet is to manage the inrush current to the load. I understand that the resistor ...
2 votes
1 answer
236 views

Why is it easier to make a boost converter stable by feeding back a very small amount of output?

The image below is about peak current mode control for a boost converter. Someone said that it's easier to make it stable by feedback a very small of output like 1/10 Vout (or R2 << R1). ...
4 votes
1 answer
537 views

Role of input capacitance for cascode-input op-amp

In the below schematic of a cascode-input op-amp, the input transistors M1 and M2 present no capacitive load to the input signals, because their gate-source and gate-drain voltages are stabilized. The ...
1 vote
1 answer
765 views

Need help understanding error amplifier compensation

This application note (for the PWM controller I am using, UC3825B) details about error amplifier compensation for the built-in error amplifier. It says it will be compensated to cross 0 dB at (...
1 vote
1 answer
91 views

Type-2 compensator transient response

I'm looking to find the transient response to a step impulse of a type-2 compensator. I already found the transfer function, but when it comes to finding the transient response by using the inverse ...