# 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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
1 vote
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. ...
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 ...
1 vote
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 ...
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. ...
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. ...
1 vote
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 ...
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 ...
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 ...
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 ...
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 (...
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 $$\frac{d^2 y}{dt^2}=-a_1\frac{d y}{dt}-a_2y+a_2u$$...
1 vote
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 ...
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 "...
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/...
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, ...
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 – ...
1 vote
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, ...
1 vote
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?
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 ...
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 ...
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 ...
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 ...
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-...
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 ...
1 vote
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 ...
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: ...
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 ...
1 vote
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 ...
1 vote
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 ...
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 ...
1 vote
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
1 vote
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 ...
1 vote
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 ...