Questions tagged [compensation]

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28 views

Controller and compensator

What is the difference between controllers and compensators While searching for answer the most prominent answer I got was that compensator have magnitude=1 and is used to make sure the system ...
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1answer
70 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
62 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
88 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
77 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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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
92 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
96 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
427 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
71 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
41 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
301 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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51 views

How to design a slope compensation circuit for a boost converter having different output levels at different input ranges?

I am working on a non-isolated boost converter, has 30khz switching frequency and uc3842b is used to implement peak current mode control. Three phase ac after rectification is applied as an input to ...
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174 views

Design of a lead compensator with root locus in matlab

For the transfer function G(s), I tried to design a lead compensator for the function to have a response to the step with the following specifications: Overshoot= 10%; Ts (2%) = 5s. When I simulate ...
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76 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
88 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
83 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
60 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
113 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
60 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
276 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
166 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 ...
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1answer
67 views

Compensation for op-amp difference circuit

I have a difference amplifier built with an op-amp (specifically, I'm using the LT6237) with 10dB gain: simulate this circuit – Schematic created using CircuitLab As it is, without external ...
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1answer
293 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 ...
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2answers
73 views

Why is this Type I compensator phase not 270 degrees?

This is a Type I compensator with a pole at origin. The transfer function between \$V_{in}\$ and \$V_{out}\$ is as follows: $$ \frac{V_{out}}{V_{in}}= -\frac{R_{2}}{R_{1}+R_{2}} \frac{1}{s (R_{1}|| ...
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2k views

Need for Temperature Compensation of Current Mirror

I am currently learning about current mirror configurations. I have made two of them so far. Both of them worked as desired but, when heated or cooled, the current through the right side (the side ...
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143 views

Overcoming cogging/ripple torque in gimbal motor

So I'm trying to figure out how to spin a camera on a brushless gimbal motor. I am feeding each of the terminals a sinusoidal pwm signal from a via 3 half bridges on the SN754410. Each of the pwm ...
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1answer
111 views

Type of capacitor for feedback / external compensation

Referring to the capacitor between the output and the inverting pin in an op-amp, in parallel with the feedback resistor --- should I use ceramic (NP0), or thin film? We're talking bandwidth in the ...
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2answers
606 views

OP-AMP DC offset compensation

I do not know how to compensate the DC-offset caused by the Input bias current. simulate this circuit – Schematic created using CircuitLab How to compensate the input current bias DC offset? ...
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3answers
2k views

How to compensate gain and offset errors

I have an analog circuit which has an offset error as well as an gain error. I can measure the analog output of the circuit and I am able to manipulate the gain of the circuit by means of a factor <...
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1answer
413 views

Op-Amp's Dominant-Pole Compensation

I'm reading "Op Amps for everyone" (http://web.mit.edu/6.101/www/reference/op_amps_everyone.pdf) and I'm currently studying the chapter about the compensation of op.amps. but I'm missing a passage. At ...
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1answer
162 views

The Frequency Compensation of LT1683 in a DC-DC Converter

The fig. 10 of Jim Williams's article presents a 2A laser current source circuit using the LT1683. I am confused about the frequency compensation circuit of fig. 10 (pin 12 Vc of LT1683). The page 8 ...
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1answer
65 views

How the effect of the output inductor is minimized and filter offers only single pole by current mode control?

In this application note "Switching Power Supply Topology Voltage Mode vs. Current Mode", page 2, Current Mode Control section the author claimed as follows: Since the Error Amplifier is now ...
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1answer
829 views

Intuitive to get pole and zero points for lead compensator

The circuit below is a lead compensator. I can easily know exact the pole and zero of the network by deriving the transfer function. However, I am wondering if there is an intuitive method to get the ...
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1answer
488 views

LM301 comparator and diodes on compensation

I'm trying to understand what's the purpose of the two diodes connected to the compensation pin (8), and what the output of the comparator is supposed to be. Also, I'd like to remove the 5V supply and ...
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2answers
420 views

BJT vs OPAMP for RF signal amplification: BJT performs better, why?

I am working on developing RF wave generation from a DDS IC (AD9834-Analog device). The voltage we require as an RF signal is 6 times (3V peak to peak, sinusoidal, DDS output~=0.5V with supply to the ...
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2answers
1k views

Calculating values for compensation network (boost converter RC+C network)

I'm trying to build a boost converter with current mode PWM control, but I'm stuck at selecting capacitor and resistor values for compensation. I'm using a LT1619 as the controller IC: simulate this ...
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1answer
522 views

Input Bias Compensation for a Comparator

I've been working on designing a discrete dual-slope ADC for school, and I've run into a problem. The schematic below shows my proposed input stage, an ideal integrator connected to a comparator. I've ...
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1answer
92 views

APD temperature variation

I know that the gain (M factor) of APD (Avalance Photo Diode) changes with temperature at a give reverse bias voltage, therefore, we need to a compensation either using a thermoelectric cooler or a ...
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2answers
782 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 ...
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2answers
265 views

Op-Amp Input Bias Compensation for Multiple Feedback Filter

I'm adding an input bias current compensation network to the positive op-amp input of my band-pass multiple-feedback filter. I'm setting the source impedance for the positive input pin equal to that ...
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3answers
3k views

Intuitive way to see pole/zero directly from schematic

The image below is the electrical configuration and the transfer function of a type II compensator using OTA. By looking at the transfer function, we can easily see that the circuit has two poles (...
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308 views

Origin pole in type II compensator using OpAmp

I am reading about Type II Compensator Using Op-Amp from the application report here (page 4). From the transfer function (4), we can see that there is an origin pole, \$f_{p0}\$. However, the ...
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2answers
556 views

Compensated Attenuator question

In the explanation, it explains that C2, C3, C4 are for frequency compensating the impedance of C1 which varies according to frequency. Can someone explain how C2~C4 does it? and why the designer ...
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3answers
600 views

Approximation of a Non Ideal Differentiator

simulate this circuit – Schematic created using CircuitLab The above circuit is a differentiator, the op amp is assumed to be a single pole op amp, that is \$ A=\frac{wt}{s}\$ The transfer ...
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1answer
286 views

Increase in compensation capacitor for op-amp

I am currently learning to design an op-amp, and understand that using compensation capacitors help to maintain stability of the op-amp. Currently, my compensation capacitor has a value around 10 pf. ...
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1answer
474 views

Understanding in-loop compensation for capacitive-loaded OpAmp

I'm trying to understand the in-loop compensation for a simple amplifier loaded with a capacitive load, as seen in this article from Analog: http://www.analog.com/library/analogdialogue/archives/38-...
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2answers
72 views

General process for compensating a complex system in the time domain

Say one has a system with feedback wrapping around some "complicated" system (more complicated than the traditional examples given): simulate this circuit – Schematic created using CircuitLab \...
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4answers
386 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 (...
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3answers
1k views

Wheatstone bridge offset

I have a Wheatstone bridge but I don't know the values of the resistances in it. My excitation voltage is 5 V. But instead of having 2.5 V on each output lines I get one line at 3.3 V and the other ...