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Questions tagged [integrator]

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4
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5answers
1k 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
61 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
32 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
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1answer
54 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
37 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
88 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
61 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
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1answer
54 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
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1answer
65 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
59 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
58 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
100 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
63 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
79 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
0answers
121 views

Deboo integrator Query

I am trying to integrate a signal, to find out the area under curve in a particular time interval. However, I need to use unipolar sources and cannot use a normal inverting integrator. Hence, I am ...
0
votes
3answers
137 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
32 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
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0answers
25 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
42 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
517 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
97 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
56 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
290 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
67 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
41 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
55 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
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1answer
94 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
0answers
108 views

Saturation due to opamp offset

I have built a non inverting integrator with a THS4631 op-amp. The circuit schematic is shown below. Without any input the output of the circuit should saturate to supply voltage. However, the output ...
0
votes
3answers
441 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
319 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
1k 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
186 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
136 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
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2answers
370 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): ...
0
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0answers
80 views

Op Amp Integrator that will adjust to frequency

I am making a synth and I need to build a circuit using op amps that will adjust to frequency (70 to 3k Hz) so the output will always be at the same voltage range. I am powering it using 5V and 0V - ...
5
votes
1answer
312 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
848 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
169 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
1k 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
707 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
90 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
604 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 ...
0
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1answer
91 views

Miller integrator dc offset ->why no gradual increase towards saturation?

I made a miller integrator with a dc offset. (The initial condition of the capacitor is set to zero so initial condition is not the problem). There is a capacitor or 10-7 F capacitance and a source ...
0
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1answer
1k views

dc offset in a miller integrator

I simulated a miller integrator circuit on multisim online. When I did so I made sure that dc offset in the op amp and the source is zero and also bias and offset currents are zero. But in output to a ...
1
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1answer
419 views

Input Bias Compensation for a Comparator

I've been working on designing a discrete dual-slope ADC for school, and I've run into a problem. The schematic below shows my proposed input stage, an ideal integrator connected to a comparator. I've ...
0
votes
1answer
234 views

Integrator Design for Small Input Signal

I am designing an integrator circuit using op-amp. The circuit works very well for inputs greater than 7mVACRMS from 10Hz to 2KHz (error is inside 1%). The issue I am having now is when the AC input ...
0
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3answers
2k views

Is it possible to make an op amp integrator that integrates a DC input?

If the integral of a DC input is a ramp, can you make an op-amp circuit that integrates a DC input into a ramp, and then displays the ramp on an oscilloscope?
0
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1answer
413 views

Non inverting integrator with reference

This circuit should work as part of DC servo circuit in audio amplifier with single power supply, maintaining power amplifier stage working point at Vcc/2 (output is AC coupled). Intuitive approach ...
0
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1answer
110 views

Help needed trying to build an audio sawtooth oscillator

I'm a total beginner hobbyist trying to understand the concept of an audio synthesizer, with a view to building one. Rather than just build a kit I'm keen to understand the concepts. Goal: build a ...
0
votes
0answers
203 views

Delta modulation (DM) signals

Trying to understand this circuit. Will this produce a representation similar to example in second image (if U_inf is the sine wave "original") ? Assuming that, I expect U_DM to look like the "...