Questions tagged [integrator]

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Does the feedback capacitor in an inverting integrator appear as a capacitive load to the op-amp in an integrator circuit?

In an answer to a question, I was told that the feedback capacitor appears as a load to the op-amp in an inverting integrator topology. If that is the case, we should see a pole with the output ...
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2 votes
4 answers
372 views

Why is this op amp configuration used in Ah method SOC estimation?

While reading a research paper about enhanced coulomb counting, I found this peculiar sensing circuit (inside the red lines). (Research paper: Xie, Jiale, Jiachen Ma, and Kun Bai. “Enhanced Coulomb ...
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3 votes
3 answers
343 views

Op-amp square wave to triangle wave converter not working as expected

A follow-up to a similar question from yesterday since the problem I've run into has differed enough to warrant something more than an edit. I have built an integrator to act as a 5V 32Hz square wave ...
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3 votes
1 answer
217 views

Square wave to triangle wave converter using Op-Amp not working

I have built an integrator to act as a 5V 30Hz square wave to triangle wave converter. My output currently looks like this. I am unsure why. The value of the triangle wave amplitude, according to ...
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3 votes
3 answers
404 views

Op-amp output voltage offset

Hi i wanted to ask what causes an offset for the following integrator setup: I`m no sure if its the virtual ground or another fundamental reason im not aware about since the signal should always be ...
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0 votes
0 answers
31 views

Matlab model: Continuous & Discrete-Time behaviour of a Switched-Cap. Integrator circuit

I would have the following question at the end of this text. To bring everyone to a common understanding, I need to first develop it a bit and make some statements. I tried to be as precise and short ...
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8 votes
2 answers
728 views

In an op-amp integrator, what is the purpose of the parallel resistor in the feedback path?

I understand how an integrator works with just a capacitor in the feedback path: When the input pulse width is much smaller than \$RC(1+A_{VOL})\$, the constant current charges the capacitor and the ...
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20 views

Relationship between sample and integrate phase voltages in figure below

The picture below is from an old midterm paper I was trying to solve (I am no longer in grad school, just brushing up on concepts). The switched capacitor integrator below was given with the integrate ...
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0 votes
2 answers
49 views

Loop Filter Bandpass Jitter Characteristic in PLL

I was watching some PLL video lectures by Professor Elad Alon, and he explains why intuitively the jitter transfer function of the loop filter to the PLL output has a bandpass characteristic. He says ...
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-3 votes
1 answer
105 views

Integrator Opamp offset cancellation feature

I am trying to build a simple integrator circuit but there are some problems. I want to eliminate offset voltage in integrator. As shown in schematic, adding a feedback circuit oscillation was ...
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1 vote
2 answers
100 views

Does slew rate specification of an op amp remain valid for an integrator configuration?

I am trying to design an op-amp integrator for a Rogowski Coil based current sensor. The op amp I use is THS4631D from Texas Instruments. It has a slew rate of 1000 V/us according to the datasheet. ...
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0 votes
2 answers
99 views

LTSpice: op-amp integrator/differentiator not working for all R and C?

I am trying to test a simple op-amp integrator (from my textbook) in LTSpice with a square-wave input. As can be seen, the output is an (almost) triangular waveform for a resistance of 1 kΩ and a ...
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1 vote
1 answer
73 views

Mathematical function a of an integrator in series with a non inverting op amp

I am trying to understand the circuit given below so I can make a mathematical model of it. The circuit consists of an integrator with a reference (offset) voltage and a non inverting op amp ...
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0 votes
0 answers
37 views

Modelling Biased APD In Integrator Circuit

I want to model a biased APD (Avalanche Photodiode) whose current output feeds into an integrator. For the IC I will be using, TI recommends the following configuration for an unbiased photodiode. ...
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0 votes
0 answers
76 views

IVC 102 Integrator IC - Photodiode Simulation Issues

I am designing a circuit that integrates a signal output from an avalanch photodiode. The component I am using is the ICV102U. Before purchasing the IC, I want to run a few simulations using LTSpice. ...
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1 vote
1 answer
63 views

How to LPF only one of the inputs to a voltage adder?

I'm taking voltages from two inputs, and I'd like to add them together using an op amp (this is actually a summing integrator). I would like to filter out the noise in V_DAC (which will not change ...
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0 votes
3 answers
97 views

Op-Amp integrator with offset voltage output time function

I am studying the function of an Op-Amp integrator with offset voltage that is in the picture below: I have derived the output voltage formula myself, but I am not sure if it is correct. The formula ...
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2 votes
3 answers
226 views

Struggling to understand how a phase locked loop reaches lock

I have a basic question regarding PLLs and how they actually achieve lock. I was told that the PLLs go into the lock when the output of a phase detector is zero, therefore to drive VCO an integrator ...
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3 votes
0 answers
213 views

What is the upper frequency limit for an op-amp integrator?

I'm designing a circuit to process a di/dt signal. As the input is the differential of the measured current, I have to integrate the voltage to provide a representation of the current. The duration of ...
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2 votes
4 answers
367 views

Why is this integrator unstable?

I am trying to convert an acceleration signal to a velocity signal using an integrator. After building the circuit, it turned out to be unstable: With no signal at the input (...
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  • 31
0 votes
1 answer
120 views

Correct block diagram of differential equation

I am studying modeling and simulation. I have to draw a block diagram (so that it gets simulated in Simulink) of the following differential equation $$ \frac{d^2 y}{dt^2}=-a_1\frac{d y}{dt}-a_2y+a_2u$$...
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1 vote
0 answers
50 views

Frequency domain analysis when sampling a switched (gated) integrator

I would like to use AC analysis (e.g. in spice) on a non-ideal op-amp integrator where the reset switch is open, and then apply a shaping function to the result of the AC simulation (in the frequency ...
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  • 1,131
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2 answers
143 views

Is the BS170 MOSFET the right candidate for the task?

I have 2 FETs in my arsenal, the BF256 and the BS170 and I want to reset an opamp integrator. Is the BS170 the right part for the task? The datasheet doesn't tell a lot, except it seems to have "...
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0 votes
0 answers
99 views

What is the output of the integrator? How do I find the frequency? Op-amp integrator+Schmitt trigger

This is the circuit: Integrator analysis: From this formula I don´t know how to get the frequency. (I don't know if this is right, but I think it is.) I found a website that says the frequency is R3/...
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-1 votes
1 answer
71 views

Differential Integrator Opamp Problem and recomendations [closed]

I want to build a simple integrator circuit with differential amplifier. I simulate it in LTspice bu I am not sure it will be able to work or not. Because R3-1Meg and it seems to high value. Maybe, ...
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  • 115
0 votes
0 answers
58 views

Basic integrator

I want to understand, how to calculate voltage in output of integrator, if there is some offset voltage in "+" input. So there are my formulas: Is it right? simulate this circuit – ...
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  • 1
1 vote
2 answers
177 views

Low-ripple sample-and-hold PWM DAC

For theory-learning purposes I wanted to see if I could design a DAC that converts a 10 kHz PWM duty cycle to an analog waveform in a sample-and-hold manner with leap-frogging capacitive integrators, ...
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  • 3,022
1 vote
1 answer
117 views

Why is my op-amp integrator charging up to the DC voltage supplied (instead of the rails)?

This is the op-amp integrator I am simulating. Theoretically I should get a ramp signal saturating at the op-amp rails, however I get the signal shown. Can anyone help me understand why?
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0 votes
1 answer
131 views

Design a triangular wave generator using a sinusoidal input

I've been going through online assignments regarding circuit designs. I've gotten a bit stuck on this one: Using a sinusoidal input voltage of amplitude 5 V and frequency 100 Hz, I need a triangular ...
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2 votes
3 answers
148 views

Noise stemming from resetting integrator

I employed an OP37 op amp to build an integrator as shown below. There is noise caused by resetting the integrator. I made V_IN ground, and ...
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  • 23
2 votes
1 answer
110 views

Weird output voltage on op amp triangle wave generator

I am trying to simulate a simple triangle wave generator using the 741 op amp in the following configuration: I'm using ngspice to run the simulation and my .cir ...
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0 votes
0 answers
123 views

Linearization of Simulink nonlinear state space models with Linearize

States of the system in Simulink Conttrol Design are identified at the output of the integrator blocks accross the system. If a model is already developed in a ...
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  • 41
0 votes
1 answer
169 views

Choosing the shunt resistor value and capacitor for op-amp integrator based on input resistance and DC gain

I think it's option C based on C = 1/R and the R2 as 10 times R1 but apparently the answer is option A. Please tell me where i'm going wrong. The full question reads The following figure shows opamp-...
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0 votes
1 answer
262 views

An Integrator Reset Circuit not working properly

I am trying to integrate the output of a Rogowski coil , with an inverting integrator with a reset circuit. I want to have the voltage level 0V during the off time of my switch, however after reset ...
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1 vote
0 answers
31 views

Derivation of the compensating resistor in integrator with DC gain control [duplicate]

Hi all in EE stackchange, I wonder how the compensating resistor (\$R_3\$) in integrator with DC gain control equals \$R_3 = R_1 || R_2\$, which is to offset effect by the input bias current. I was ...
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0 votes
2 answers
86 views

Numerical output of RC Circuit

I am trying to numerically generate the output voltage of an RC Filter to that of Plot 1 using the following formula. Using the following code: ...
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  • 301
0 votes
2 answers
572 views

How to remove the DC offset from the output of my op-amp integrator?

I am trying to simulate an active integrator for Rogowski coil based current sensing application. The following is my circuit. Rogowski coil with active integrator: The current to be sensed is ...
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1 vote
0 answers
152 views

Settling time of an op-amp integrator

I am trying to simulate an op-amp integrator with a high bandwidth op-amp LTC6253. When I apply a 2mv-p2p signal centered at zero voltage, the integrator settles with an exponential voltage envelope ...
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1 vote
3 answers
421 views

Increasing sensitivity of photodiode amplifier

I have build a 2-stage amplifier circuit for amplifying the current from an InGaAs photodiode. It uses 2 OPA4350 op-amps. The first stage is a TIA with a feedback resistor = 1MΩ. The 2nd stage is a ...
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0 answers
123 views

Does the op-amp integrator drift error due to offset voltage and bias currents depend on the configuration inverting or non-inverting?

I have made the following two circuits to check for integrator drift errors in LTSPICE. I have grounded both inputs, so that only the offset voltage and bias currents are integrated. I expect ramps as ...
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1 vote
0 answers
163 views

Differential integrator vs standard

I want to integrate/amplify a very small signal (relatively short pulses of 100ns to 4ms, necessitate high-bandwidth components minimum 40MHz+). The capacitors will be switched (shorted) when not in ...
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  • 427
9 votes
2 answers
2k views

RC integrator: why does it convert a triangular wave into a sine wave?

The output voltage of an RC integrator circuit is proportional to the integral of the input voltage. This means that a triangular wave should transform into a quadratic curve (since the integral of a ...
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0 votes
2 answers
167 views

LTspice simulation doesn't agree with predicted transfer function

I am trying to create an integrator in LTspice that I will use as a subcircuit in a signal chain later, but can't get the simulation results to agree with my theoretical calculations. I derived the ...
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0 votes
1 answer
50 views

How gain is changed in this Op-AMP integrator?

Hi, I am simulating this circuit for personal development. The gain of the integrator can be calculated using the following formula: Gain = -Rf/R1 (1/(1+(2 x pi x f x C1 x Rf))) But, how to calculate ...
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0 votes
1 answer
120 views

Problem with a tracking LM337 stability

I'm building a dual rail tracking power supply, for the negative supply because the current is not going to exceed ~200 mA I decided to use LM337 both for simplicity and stability of the circuit (so I ...
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  • 2,036
0 votes
1 answer
270 views

Help me understand this voltage to frequency converter circuit

I got the schematics for a voltage to frequency converter (VFC) from https://www.multisim.com/content/6L...amp-comparator-voltage-controlled-oscillator/. I tried it in TINA-TI and it works. Can ...
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1 vote
2 answers
80 views

What is the role of the Op-Amp integrator in this circuit?

Helo dier community! I got a 400 Hz broken Power Inverter and reverse-engineered the circuit just for the simplicity of repairing it. Then I got deeper in and started to understand the engineering ...
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  • 69
1 vote
2 answers
176 views

Stick-Slip Piezo Linear Stage Driver - Prevent the Load from Changing Driver Output?

I am currently trying to develop a circuit that generates ramp waveforms to control the motion of a piezo linear stage. Specifically, two waveforms need to be possible to output: a slow ~250us upward ...
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  • 89
0 votes
2 answers
292 views

Why feedback resistor be at least 10 times of the input resistance?

Figure below is an integrator with reduced output offset due to the 10R shunted at the capacitor. It was written on the book that: One way to reduce the effect of input offset voltage is to decrease ...
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0 votes
2 answers
94 views

Integrator with DC component

I have been puzzling my mind about this circuit for a few days and I have few questions. It seems like this -400mV does a lot of changes to a circuit. So here is a picture: Can anyone tell me why my ...
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