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Questions tagged [integrator]

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3
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1answer
64 views

Calculate right leg drive integrator

My question intersects with "What does this op-amp circuit do? (part of an ECG)", but I need some more detailed clarification on the opamp integrator of this right leg drive circuit as found in the ...
1
vote
3answers
74 views

Difference between two integrator circuits

What is the difference between the two integrator circuits? They are used in an amplifier with feedback. There's heaps of information online about the one on the right but not so much about the one on ...
0
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3answers
81 views

Sine Wave Input for Op Amp Integrator but Output Looks Weird

The input is in sine form (AC input) but the output (in blue color) is the straight line. So what is wrong with my schematic in LT Spice this time? I thought I should've got output in sine form if I ...
1
vote
3answers
118 views

How to produce sawtooth waveform from square waveform?

I have a question pertaining the changing of square waveform to sawtooth waveform using OpAmp. Following the picture below, I have to create a sawtooth waveform from a square waveform. It seems that ...
3
votes
1answer
70 views

RC Frequency to Voltage Converter

I'm an electronics engineering student and I want to state that this question is not my homework, it is a tiny part of my project (PWM encoder) but I couldn't pass it. I'm trying to make a "frequency ...
0
votes
1answer
50 views

Function generator design

So i was asked to design a function generator that eventually produces a sine wave at the output of the circuit and this is what i have come up with so far. A Schmitt trigger and then an integrator ...
0
votes
2answers
49 views

Input Bias Compensation Resistor Calculation for an Integrator

I have been reading the following tech note from Analog Devices that discusses designing an op amp circuit to compensate for the input bias current: https://www.analog.com/media/en/training-seminars/...
0
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2answers
133 views

The Art of Electronics (Integrators)

Reading this topic from "The Art of Electronics" : Integrators How does RC keep V << Vin?
4
votes
2answers
209 views

DC input on op amp integrator

I am trying to integrate a DC tension with a classic op amp integrator. The problem is : when I simulate my circuit on LT Spice, the output will always be equal to the VEE tension of the op amp ...
0
votes
0answers
48 views

RC integrator+ BJT emitter follower

i am designing a circuit able to draw IV curves of LEDS and diodes through Arduino. Basically i use the PWM function and an RC integrator to have an approximately constant voltage. Then i would ...
0
votes
1answer
80 views

Adjusting duty cycle without affecting frequency of a VCO

I've looked around the internet for a simple voltage controlled oscillator that is able to produce various waveforms in phase with one another. I asked about it in this site and was directed to a dual ...
5
votes
5answers
2k views

How does an op amp integrator work?

I know there are at least two questions related to this on stackoverflow but neither really answer my question, and in any case, both questions got downvoted. What I am after is an operational ...
1
vote
1answer
103 views

Op Amp integrator - limiting +Vsat to zero (ground)

Part of the Dual Slope ADC consists of an integrator which integrates the input voltage according to Vin/-Vref . I am using TL071 connected as an inverting integrator. Quick summary of operation: ...
0
votes
1answer
38 views

RC Integrator mean value

i am trying to understand the behaviour of an RC integrator for \$f>>1/RC\$, i.e. in the integration domain. I know that at the capacitor i have \$V = \int V_{in}/RC dt\$; experimentally i find ...
0
votes
1answer
74 views

How do integrator circuits serve as memory devices in continuous time system?

I didn't understand the yellow-marked sentence clearly, and even I did, what does it have to do with the conclusion that follows it? (marked in green). Thanks in advance.. Source: Modern control ...
0
votes
2answers
113 views

Can Op-Amp (LM358) works as an integrator without dual mode power supply?

I am a noob with analog electronics, so pardon me for any mistakes. I recently started with Op-Amp and currently working on a project whereI am using Op-Amp in integrator mode to convert square wave ...
0
votes
1answer
160 views

I need help sing a 555, op-amp integrator, and comparator to generate a voltage controlled PWM signal

I have LM358p op-amps Datasheet I'm trying to base my design off this: retrieved from here. My control voltage will vary between 0 and 3.5v. I want the output pulses to vary between 2.5 and 0.5ms ...
0
votes
2answers
67 views

Why doesn't my operational integrator work?

Here is the schematic I'm following, to build an operational integrator. (Image source - Electronics Tutorials) I'm using a LM358N IC which has 2 op amps. Below is a crude drawing of my connections. ...
0
votes
1answer
86 views

Control Theory Integrator Phase Shift

Guess I should know the answer, but I can't come up with a good explanation. I always have to remember which sign cos and sin have after integration/differentiation. I usually do this by thinking of ...
-2
votes
1answer
94 views

effect non- inverting resistor in the integrator op amp

While looking into integrator op-amp circuits, I came across two different implementation. In one the non-inverting terminal is grounded . While in the other there is a resistor in between. Can ...
1
vote
1answer
66 views

Integrator circuit time interval

I am designing an Alpha particle time of flight detector which consists of two scintillators separated by 5cm of vacuum (few Torrs). The two scintillators are connected to two separate avalanche ...
1
vote
1answer
77 views

Do switched capacitor integrators have lower drift?

Im interested on getting long analog integration times, the continuous-time integrator drifts due to DC offset errors such as voltage offset, bias current and offset current, limiting its useful ...
2
votes
1answer
103 views

RC-circuit with one input terminal and many outputs with different integration time

What is the simplest way to create an RC-integrator with one input terminal and several output terminals which differ their times of integration (see schematics below). simulate this circuit –...
1
vote
2answers
71 views

Obtaining noise spectral density of OP-AMP from Peak to Peak voltage

I'm in need of a low offset opamp for integrating purposes, I also need it to be very low noise since the output of the opamp will go into a 3000 V/V gain stage. The opamp that seems to satisfy my ...
1
vote
1answer
84 views

Op. amp. with integrator - enough values to start?

All the red-circled values (Uref, C2, R31 and R36) are missing. I'm supposed to calculate them, but I think there's at least one value missing. Shouldn't Uref be known to calculate the rest of the ...
0
votes
3answers
147 views

Area under curve within a particular time window

I am trying to make an analog circuit which would measure the area under the curve of a periodic signal within a certain time window (say, t2 and t3 in the image). I expect different voltages(say 50-...
1
vote
0answers
46 views

Scaling of magnetic field strength and flux density measurements and shape of hysteresis loop

Note: this is part of a larger question which I was asked to separate into subquestions. Other subquestions: 1 and 2 I'm using the method outlined here to measure the induced magnetic flux density in ...
0
votes
0answers
48 views

Cutoff frequency of passive RC integrator used to measure magnetic flux density

Note: this is part of a larger question which I was asked to separate into subquestions. Other subquestions: 1 and 2 I am using a passive RC integrator to measure the induced magnetic flux density in ...
1
vote
1answer
55 views

Buffering the input to a passive RC integrator used to measure magnetic flux density

Note: this is part of a larger question which I was asked to separate into subquestions. Other subquestions: 1 and 2 I'm using the method outlined here to measure the induced magnetic flux density in ...
8
votes
2answers
778 views

How to make a constant current sink in the pA-nA range

I am tasked with making a constant current SINK for a testing device. It must outputs 4 separate values, -10pA -100pA -1nA -10nA. I need the current to last for at least 10-20 seconds, preferably up ...
0
votes
2answers
192 views

VCO from a rectangular and triangular signal generator

I need to create the simplest rectangular and triangular signal VCO I can using op amps. The output frequency should be changeable between 1k and 15k. I should also be able to change the amplitude of ...
0
votes
1answer
64 views

I need a circuit for a linear integrator using a capacitance multiplier

There are various circuit topologies for capacitance multipliers using op-amps. I need to implement a linear integrator where it would be advantageous to reduce the size of the integrating capacitor ...
3
votes
2answers
501 views

LF356 integrator simulation using LTspice

I used the LTpsice to simulate the feedback performance of a integrator circuit with op amp LF356 which is a JFET input op amp but I go strange results (see the image below). The model of the LF356 ...
1
vote
2answers
68 views

Operational Amplifier Integator

I want to design op amp integrator circuit with variable time constant using a simple switch. What is the typical shunt capacitance of a switch? I assume Ron of switch to be less than 5 Ohms. I want ...
0
votes
1answer
55 views

What is the frequency response of a charge mode amplifier?

I'm having some difficulty understanding the frequency response of a charge mode amplifier, circuit shown in Figure 1 below. ...
0
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0answers
74 views

Gated integrator IC, non continuous

Can anyone give me any suggestions for some good gated voltage integrators that aren't continuous, and more like a boxcar integrator? I want to integrate the the total voltage across a pulse coming ...
0
votes
1answer
160 views

Integrator DC drift

I have to integrate signals very precisely, and Im facing DC drift on inverting integrators using opamps. The usual cure is to add a resistor in parallel with the capacitor, however this produces a ...
0
votes
3answers
758 views

Ideal integrator op-amp DC offset at output?

i have a question with this ideal op-amp integrator circuit where R=1k and C=1uF. Then i put a 50mV 100Hz square wave at the input and get the following response, which is what i expected and ...
1
vote
1answer
417 views

How does the compensating resistor act in op amp

Figure above is an integrator which has a compensating resistor Hi there and I have a question about the compensating resistor, which is connected to the positive input in above circuits. I know the '...
0
votes
2answers
2k views

Integrator as DC servo

I have used integrators in the feedback loop of standard inverting and noninverting amplifiers to eliminate DC off-set at the output, the circuit Im talking about is something like this simulate this ...
0
votes
1answer
248 views

Circuit analysis using an op-amp (non-ideal integrator)

I've the following circuit: simulate this circuit – Schematic created using CircuitLab My question is, is my method right to find the output voltage in relation to the input voltage? My Work: ...
1
vote
2answers
165 views

Implementing the I action in an analog PID controller

Can I implement the I action in an analog PID controller as follows?: simulate this circuit – Schematic created using CircuitLab And am I right when I say that the voltage follower is used to ...
1
vote
2answers
591 views

Vary the integration factor of a opamp integrator

I am working on a analog PID circuit and I need to make a opamp integrator circuit where I can change the integration factor. Now why do I've to make this circuit (I saw the circuit for example here): ...
5
votes
1answer
396 views

Op-Amp “Fast Integrator” Circuit

I'm trying to understand this circuit taken off of this application note. To get it out of the way, I'm familiar with the basic integrator circuit and its workings. What I'm having trouble with are ...
0
votes
1answer
1k views

Why is such amplifier configuration chosen for HB100 microwave sensor?

For HB100 microwave sensor module, I don't quite understand how this amplifier works and why it's been chosen instead of something simpler, such as two inverting or non-inverting op-amps. What can see ...
0
votes
2answers
186 views

RC integral and differential functions, Schmitt triggers. How does this circuit work?

I'd be happy if someone explained me why this circuit is the way it is; how does it work ? Also i would like to know what the value for C1 is. Taken from https://www.electroninvest.com/shop/items/...
1
vote
3answers
2k views

Obtaining a triangle wave from a square wave using a LM324N op-amp

I am generating a square wave with a 555 timer chip and I am trying to obtain a triangle wave from the 555's output by using an op-amp (LM324N) as an integrator. The op-amp is in single power supply ...
0
votes
1answer
1k views

Miller integrator

In the following problem I first drew the output waveform as a straight line with a negative slope starting at zero and constantly decreasing till it reaches -1V(section b in the question). I figured ...
0
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1answer
117 views

Two Miller integrator in series

How may I deduce the time constants from these output waveforms? For \$V_{o1}\$ may I write \$\tau=1/2\pi f\$, where \$f=1/T=1/1ms=1KHz\$?
-1
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1answer
704 views

How to reset an integrator ONLY with RLC and op-amps?

I am trying to reset an integration circuit that is designed like above -- but obviously with another resistor attached to the op-amp positive input side as well. I have used 4.7k\$\Omega\$ resistors ...