Questions tagged [integrator]

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49 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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1answer
66 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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0answers
20 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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0answers
40 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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1answer
59 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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3answers
65 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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3answers
180 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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0answers
89 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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4answers
230 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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1answer
52 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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0answers
38 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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2answers
107 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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0answers
70 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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1answer
60 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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0answers
51 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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2answers
117 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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1answer
83 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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1answer
88 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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3answers
127 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 ...
2
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1answer
93 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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0answers
95 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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1answer
113 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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1answer
102 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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0answers
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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2answers
83 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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2answers
318 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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0answers
101 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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3answers
305 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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0answers
102 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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0answers
136 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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2answers
1k 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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2answers
117 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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1answer
47 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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1answer
101 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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1answer
254 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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2answers
75 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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2answers
161 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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2answers
212 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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2answers
71 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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3answers
210 views

Summing Integrator cut off

I would like to know how to calculate cut off frequency of this summing integrator circuit. I fail to find anywhere on the internet how to calculate cut off frequency in this configuration. Then how ...
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1answer
216 views

Using PWM to create DAC

It is my understanding that a square wave can be converted to a smooth analog signal via passive low pass filter. However, this low pass filter acts like an integrator which ideally achieves the same ...
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7answers
2k views

Op-Amp Integrator's virtual ground

I have been using op-amp TL072C in charge integrator configuration. R = 1k Ohms and C = 100 uF. Vin is a DC signal of 1 V. VCC = 10 V and VSS = -10 V. I get the expected output which is VSS, when a ...
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1answer
82 views

Is there a component that will OR the last 1-2ms of its input?

I need a component/circuit which will output 1 if a 1 has been input at any time in the last 1-2ms. I could make such a circuit out of several shift registers, an oscillator and several OR gates, or ...
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1answer
309 views

What happens when this integrator circuit reaches saturation?

I'm trying to understand integrator circuit timing, specifically at the point of op amp saturation. Here's my circuit: The op amp is dual supply +/-12V. Vin is a ...
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2answers
136 views

DC component in an integrator circuit using opamp

While doing this project I ran into a problem. We are using an opamp in a integrator circuit. However we noticed the existence of a DC component that only apears when the input frequency is high. I ...
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5answers
5k views

Feedback resistor value in op amp integrator

Without the feedback resistor, \$\frac{v_{in}}{R}\$ current flows through the capacitor and charges it to \$v_{out}(t) = -\frac{1}{RC}\int\limits_0^tv_{in}\,dt \$ Good so far. My textbook says a ...
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1answer
92 views

Hold OPAMP Integrator at zero voltage (Guarantee defined slew rate)

I have the following request: I want to stop a common integrator (which should generate a defined slew rate for a square wave signal) exactly at zero (0 Volt) due to the return-to-zero coding of the ...
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1answer
135 views

Low pass filter vs integrator

Context: I am programming a flight controller for an autonomous drone. I want it to be able to hover in place so I am working on a PID controller for the throttle to keep vertical velocity at 0. (...
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1answer
405 views

Duty cycle detection circuit for square wave

I have two signals coming out of one block. One signal is one period delayed than the other one. Is there any method to detect the duty cycle of these pulses?. Edit: Clk is my original signal. Going ...
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2answers
708 views

Is this a Miller integrator?

When I googled Miller integrator the sixth picture that popped up is this one, but I'm not completely sure what circuit it is and if it is something similar to the simple "standard" op-amp Miller ...