Questions tagged [compensation]

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67 views

How to improve the accuracy of measured ADC voltage in a circuit connected to Vcc

The question is based on the following setup. As depicted there is an IC to measure the real value of the 3.3V supply voltage accurately. The measured value of the 3.3V source is transferred via SPI ...
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1answer
56 views

Offset problems with charge amplifier

I have a question about designing a charge amplifier. I am currently using this simple setup for my application. As input, I can use several commercial piezo-based accelerometers. I need a pretty ...
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0answers
26 views

Isolated Type 3 Compensator

I'm trying to build a full bridge dc-dc converter and planning to apply a type 3 compensator(voltage mode). When I check the isolated feedback type 3, I've read some comments indicate that it's hard ...
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25 views

Phase Lag Compensator

Good evening, I have a question on lag compensators in general. Why do they increase both the rise time and the settling time? Is it because due to the introduction of a slow pole? Much thanks
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1answer
114 views

Dual slope ADC circuit

I`m currently building a dual slope ADC with discrete components. As expected, some errors were observed. I have calculated both the gain error and offset error variables. Now that I know these ...
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1answer
34 views

Designing a compensator - Control system - Missing value

I would like to determine the transfer function of the following circuit made of TL431. According to the different AN that I have read (and about this subject I really really thank Christophe BASSO, ...
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1answer
75 views

Tilt compensation for yaw calculation from magnetometer and accelerometer

I am working on a project where i have to calculate the raw, pitch and yaw angle using an accelerometer and a magnetometer. I calculate the pitch and roll angle through the accelerometer and I am ...
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1answer
34 views

Maths behing implementing temperature compensation on a signal

I have a fluid pressure sensor (blue line) whose measurements are affected by outdoor temperature (yellow line). So there is a 12 hours cyclic component (day/night) in my pressure measurements. How ...
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2answers
400 views

Why does overshooting occur when probe's adjustable capacitor is under-value

I can't wrap my head around how overshooting (the spike) happens when the 10X probe capacitor trimmer (Cp) is under-tuned (i.e. adjustable capacitor's value is not high enough). There are countless of ...
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2answers
103 views

butterworth configuration of multi-stage amplifier

When designing a multi-stage operational amplifier, people usually use butterworth polynomial to set closed loop pole location of the op amp in feedback configuration, and then back calculate to open ...
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0answers
59 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 ...
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0answers
11 views

i have two questions about value of adc being changed

I want to acquire the values movement of two strain gauges attached to dc motor For example, first strain gauge has values around 10000, the second has 20500 in 0 degree while the first is 10400, the ...
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1answer
53 views

Questions about coil voltage and phase shift in the WPT system

I performed simulations of wireless power transfer in matlab simulink. It was powered with DC voltage which was then converted into a rectangular voltage with a frequency of several dozen kHz. The ...
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1answer
235 views

DC Gain of the System

I'm trying to design a feedbcak loop compensator and I'm following the instructions on power supply cookbook. Book has calculations for DC gain like equations below: in my situation Vin: 40V-60V and ...
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2answers
62 views

Compensation of custom high voltage power supply

To test an offline switching PSU I decided to build a custom isolated high voltage variable PSU. The idea was to build a nice, small, low power equivalent of a variac and isolation transformer that is ...
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1answer
82 views

Microstrip blocking capacitor ground cutout — large cutout size

I'm attempting to minimize the \$S_{11}\$ of a \$10\,\text{pF}\$ DC blocking capacitor on a microstrip trace for my signal frequency range, which is \$5.3-5.9\,\text{GHz}\$. My microstrip trace width ...
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1answer
345 views

3 wire load cell and HX711 weight compensation

in my project I use 3 wire load cell (like this (3wire 50kg) but mine are purchased from ebay) and HX711 for weighing. My wiring is like this (but i use Arduino mini pro 3V3): Apparently it should ...
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0answers
55 views

Using frequency-compensated resistive divider as digital level-shifter

We have all seen the "frequency-compensated resistive divider" circuit in, for example, 10X oscilloscope probes: simulate this circuit – Schematic created using CircuitLab Has anyone tried ...
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1answer
43 views

Sensor Error Adjustment

I have been asked to improve the high end accuracy of a pressure sensor (Without modifying hardware). I have collected data from 30 samples and found a trend to the error. My question now is if it is ...
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1answer
85 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 ...
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2answers
234 views

Frequency compensation and feedback capacitance

I was reading the chapter of Microelectronic Circuits (Sedra Smith) about negative feedback systems, and it shows an example of Miller frequency compensation with the capacitance Cf shown in the ...
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1answer
207 views

Two stage op-amp design with compensation ideas

I am trying to design an op-amp with a high-pass feedback. The diagram is shown below. The high pass feedback has a corner frequency at 1Hz. The op-amp itself is two stage as can be seen below. ...
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43 views

How to determine these resistors in 2-pole 2-zero feedback loop compensation

I'm trying to build a 2-pole 2-zero feedback loop compensation for controlling a full bridge dc-dc converter. It's my first time doing this and I'm following the book power supply cookbook. Book is ...
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23 views

Slope compensation of MAX17498

I want to use MAX17498 in boost mode. I have a problem setting the slope compensation. The slope (as I understand) is the gradient of the inductor's current ramp. The unit is [A/s] or [A/us]. However,...
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1answer
82 views

Stability of SMPS designed for a motherboard

Many books have covered the stability of many configurations of switch mode power supplies and they have given details on how to set the poles and the zeros of the compensator to make the the power ...
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1answer
668 views

Implementation of Adjustable Current Limiting Circuit

I have a circuit that can deliver 0-10V and 0-100mA to a load, and want to have an adjustable current limit that will limit the current delivered. To do this I have a current shunt that I monitor, and ...
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0answers
157 views

Type 3 Compensation on Full Bridge DC-DC Converter with SG3525

I'm trying to build a 48V-400V full bridge dc-dc converter. I'm using sg3525 as pwm IC and trying to get isolated feedback from output and planing to do it with TL431. When I study on it people are ...
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1answer
66 views

Non Inverting Type 2 and 3 compensators

I'm looking for the topology and transfer function of a non-inverting type 2 and 3 compensators (PID controller). they are used in CC and CV feedback control in charging/Discharging circuits of ...
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1answer
266 views

Designing a lead compensation for a 3rd order system

Question Title: Consider the control system shown in Fig.1. Design a compensator such that the unit-step response curve will exhibit maximum overshoot of 25% or less and settling time of 5 sec or ...
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2answers
557 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 ...
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1answer
47 views

Is it possible to create power factor compensation for a single power supply?

A 24V 150W power supply's power ratings is marked on its surface as follows: In this case as you can read the cos phi is 0.45. I know that the utility which provides power to the systems wants to ...
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1answer
97 views

Poles and Zeros of a Transfer Function

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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1answer
444 views

Loop compensation of a Buck Converter

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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4answers
275 views

Negative feedback and op-amp poles

I'm trying to get a better understanding of frequency compensation for op-amps. I'll start off with a very specific questions and then get into the context. For a certain op-amp, open loop gain is ...
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1answer
159 views

Constant-gm bias circuit

I am doing a study on Improvements in biasing and compensation of CMOS opamp. Do you guys know how to come up with the equation for RDS4C ?
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141 views

opamp constant-gm bias circuit

I try to incorporate the constant-gm bias circuit (Figure 6 in Improvements_in_biasing_and_compensation_of_CMOS_opamp) into the PFC (positive feedback frequency compensation) opamp, but it resulted in ...
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1answer
254 views

Analog implementation of imaginary roots in a transfer function

I have a simple boost converter, and from multiple papers I've read through, a Type 3 Compensator is recommended. I designed one in Matlab/Simulink, and it reacts very quickly. The problem is, when I ...
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2answers
265 views

Compensation capacitor(s) in instrumentation amplifier

I wonder whether the discrete 3-opamp instrumentation amplifier requires any compensation capacitors: simulate this circuit – Schematic created using CircuitLab Is it in general recommended to ...
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2answers
537 views

Crystal compensation for temp and voltage

Introduction I'm toying with the design for a fail-safe wall clock controlled by multiple 32.768kHz crystal oscillators. I'm currently reading about compensation. Compensator from literature From ...
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2answers
259 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 ...
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1answer
57 views

Static VAr Compensation

I have to design a 3 phase Reactive Power Compensation System with using only reactors, no capacitor is needed. Total capacity is 505kVAr, but 475kVAr will be done with contactors, rest (30kVAr) will ...
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3answers
402 views

Why is frequency compensation required here?

Circuit requirements: DC voltage gain: 50dB Unity gain bandwidth: 50MHz Phase margin: 45 deg(60 deg is recommended). The circuit is completely symmetric, so M1=M2, M3=M4, and M5=M6. Therefore the ...
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0answers
94 views

4-20mA current loop - transmit sensor reading

I am working on design loop current transmitter- to transmit reading value from thermocouple sensor using below design. I measured co-junction temperature using NTC instead of RTD. During applying ...
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1answer
160 views

Hybrid Boost-Flyback Stability Issue

I tried to design a step up SMPS to create ~200-300V from a 24V input with an expected power of ~12W max. Since the project is for a hobby, I chose to attempt a hybrid boost-flyback converter to get ...
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1answer
185 views

Adjustable non-inverting Buck-Boost converter failing right after starting in boost-mode

I am designing an adjustable non-inverting buck-boost converter based on LM5176 chip. Adjusting is done by DAC via feedback network, more on that technique can be found here. The input voltage is 32V ...
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1answer
126 views

-20 db/decade Gain Slope requirement for Stability?

I have been learning Analog Filter designing. I started with Loop Compensation in power supply. I came across a document. It ...
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1answer
334 views

DCDC converter load step and phase margin

When applying load step to a DCDC converter we can approximate the phase margin from the presence/absence of oscillation and the crossover frequency as well from the response time. The question is: ...
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1answer
77 views

Dynamic Compensator in Control Loop

Sorry if this has been asked previously, but I couldn't find anything here or elsewhere on Google (but maybe I'm searching the wrong terms). I'm trying to design a Type 2 compensator for a PWM chip I'...
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1answer
427 views

AD4610 - Is it possible to eleminate this single overshoot

I am trying to compensate input capacitance of the AD4610. It does not matter if it is actually over- or undershooting - there is always a spike: I do not have this problem with the OPA4141 for ...
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1answer
281 views

design of compensator type 2 for current mode control of boost converter?

I have designed 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 ...