# Questions tagged [integrator]

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### Implementation of Gain as a Resistance in an Integrator

I am trying to follow along with a thesis project block diagram but I am fundamentally confused as to how they have implemented the circuit. The above circuit is a delta-sigma modulator but more ...
• 25
57 views

### Origin of the signal in an oscillator composed of a Schmitt trigger and an integrator

Following instructions, we built this oscillator as part of our electronics course: I was surprised at first that we could get those signals without any initial signal connected to the op-amps input. ...
• 191
234 views

### AC Op-amp integrator with DC Gain Control in LTspice

Our teacher explained to us that this set up allows us to produce the effect of a low pass filter: I have indeed found useful formulas to achieve this. The problem however is that when I simulate ...
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1 vote
48 views

### Mean value of square signal between 0 and 15 V in LTspice

I would like to get a signal that is the mean value of a square signal going from 0 to 15 V using an integrator op-amp. Here is what I'm getting so far (the op-amp I have put is the UniversalOpAmp2): ...
• 191
106 views

### Producing a sawtooth wave from a square wave

I am trying to produce a sawtooth wave from a 2 MHz square wave. For this, I am using an LT1800 op-amp. I want to get a -5V to 5V sawtooth wave shape. I did not do this in LTspice. I made the ...
1k views

### What is the purpose of the resistor in a RC circuit?

I understand that a capacitor can pass high frequencies and block low frequencies, because of its impedance properties. Now, why do you need to put in series a resistor? Doesn't it already filter ...
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1 vote
117 views

### RC-OTA versus gm-C integrator in CT Delta-Sigma

In the book "Understanding Delta-Sigma Converters" of S. Pavan, R. Schreier and G. Temes they are stating the following speed comparison of the RC-OTA and gm-C integrator: The impressive ...
• 13
1 vote
193 views

### Phase shift of an ideal op-amp integrator

I derived the transfer function of an ideal op-amp integrator and calculated the phase response of the Bode plot. My own derivation matches the result of this website. This means for the transfer ...
• 979
1 vote
208 views

### Practical integrator using op-amp

I'm trying to simulate a practical integrator using NI Multisim 741 op-amp. But I dont quite understand a variation in my waveform. I'm applying a 1 kHz, 5 V sinusoidal signal as input to the op-amp. ...
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57 views

### Verifying the Measurement Precision of a Circuit

My aim is to build an electronic circuit that allows me to measure the relative precision of the energy of optical pulses in the order of 10^-6. The optical power of the laser pulses is measured with ...
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1 vote
107 views

### Effect on stability margins when an integrator is introduced in the loop of a closed loop system

I was asked a question in a control system test which is as follows: *Introduction of integral action in the forward path of a unity feedback system results in a a) marginal stability b) system ...
99 views

### Is there also equal voltage on the inputs of an op-amp with a capacitor in the feedback rather than a resistor?

It can be mathematically proven that when we have a resistor in the negative feedback of an op-amp, the input voltages in the inverting and non-inverting terminals get equal. I'm wondering if we can ...
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48 views

### Integrator circuit input signal

I made an ideal opamp, but I have a doubt regarding using it as integrator. If I give input as square wave, will it affect the bias? As far as I understand usually bias is required after which AC ...
210 views

### 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 ...
420 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 ...
• 611
412 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 ...
• 707
548 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 ...
• 707
564 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 ...
• 153
1k 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 ...
• 1,080
72 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 ...
139 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 ...
• 145
1 vote
154 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. ...
258 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
80 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 ...
76 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. ...
168 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. ...
1 vote
69 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 ...
192 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 ...
311 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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### 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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644 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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424 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
75 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 ...
• 1,119
241 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 "...
• 287
153 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/...
83 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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### 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 vote
294 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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1 vote
180 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?
269 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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### 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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### 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 ...
178 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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### 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-...
562 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 ...
1 vote
32 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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### 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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### 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 ...
1 vote