Questions tagged [integrator]

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Effective Capacitive Loading of Active RC Integrator

For a simple active RC integrator shown above, what is the effective capacitive load when output is open-circuit. I think it would be the integrating capacitor, \$C_I\$, because of the virtual ...
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26 views

How do integrators affect encirclements in the Nyquist plot?

I am trying to write a program to determine the closed-loop stability of a system using a frequency response function for data-driven control. I count the number of clockwise(CW) or counter-clockwise(...
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1answer
61 views

How to use a Piezo ShockSensor and an op-amp practical integrator?

I have made this circuit : Once I apply a shock to the sensor, I get this result on the scope : CH1 (yellow) : piezoshock output CH2 (blue) : LTC6240 output Here is the spec of the piezo sensor : ...
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3answers
2k views

Why is inverting op-amp behaving like a low pass filter?

can anyone explain why this circuit behaves like a low pass filter despite having no capacitor in the feedback loop?
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2answers
61 views

How to integrate current signal to be able to measure it with 50 ohm input impedance of ADC

Preliminaries I am using a photomultiplier tube (PMT) in order to amplify scintillator's light signals. Some of the studied scintillators have long decay time and poor light yield. That makes these ...
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1answer
49 views

Is this Non-Inverting integrator correct?

I've seen time again the formula for an inverting integrator. I was wondering if I could swap the configurations on the inverting and non inverting inputs of the op amp to make the circuit a non-...
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42 views

Design an integrator using a two-stage OTA

How do we design an integrator using a two-stage OTA (Folded Cascode[Differential amplifier + common gate stage] + gain stage) for the following specifications; Analysis of all equations of your ...
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1answer
87 views

Integrator with DC control gain

I am analyzing the integrator circuit and I can't get from which equation can I get the frequency where there is the intersection with x axis - 1/C*R1 ? Thanks! source
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3answers
136 views

Is there a simple way to discharge a bipolar capacitor using a 5V signal and a MOSFET/BJT?

I am using an op amp configured as an integrator, as shown in the schematic below. There is an input signal which can go both positive and negative [+1V ... -1V], and then depending on this input ...
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1answer
96 views

Understanding a dual op amp integrator circuit

I've come across this part of a circuit from a precision multi-slope ADC, it is described as a "Dual op amp integrator", but I am left confused as to what U11 accomplishes in this circuit, This part ...
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1answer
51 views

How to select resistance to cancel offset output voltage due to bias current?

Consider the figure above how Rcomp was choosen. I know for simpler circuits like inverting amplifier and ideal integrator how Rcomp was calculated but following same procedure (that's using ...
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1answer
244 views

How to calculate error amplifier output in amplifiers

I'm trying to derive an accurate formula for the output of an error amplifier in the class D amplifier I'm simulating. Most literature on the error amplifier/integrator in class D amplifiers glosses ...
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1answer
91 views

Op amp circuit with two capacitors

Based on an electronics lecture, we are dealing now with the preamplifier circuit for a detector. The figure is shown below. Actual I am having the problem to understand the center operational ...
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1answer
135 views

Transfer function of a summing integrator

I'm trying to derive the transfer function of a summing integrator for use in a feedback circuit. The single input and double input integrators are shown below. An integrator with one input is ...
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1answer
42 views

Why is the gain of an integrator built using op-amp -Rf/R1 till cut-off frequency

As you can see the gain is constant for the practical op-amp, even though gain is This shows that it clearly changes for every frequency. Is the one in the graph an approximation, maybe because it ...
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2answers
209 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 ...
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3answers
154 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 ...
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3answers
194 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 ...
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3answers
360 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 ...
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1answer
123 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 ...
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1answer
75 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 ...
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2answers
117 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/...
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2answers
140 views

The Art of Electronics (Integrators)

Reading this topic from "The Art of Electronics" : Integrators How does RC keep V << Vin?
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2answers
353 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 ...
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0answers
71 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 ...
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1answer
401 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 ...
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5answers
3k 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 ...
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1answer
159 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: ...
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1answer
62 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 ...
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1answer
118 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 ...
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2answers
423 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 ...
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3answers
296 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 ...
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2answers
97 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. ...
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1answer
256 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 ...
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1answer
129 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 ...
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1answer
70 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 ...
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1answer
101 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 ...
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1answer
110 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 –...
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2answers
88 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 ...
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1answer
88 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 ...
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3answers
165 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-...
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0answers
58 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 ...
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0answers
67 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 ...
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1answer
73 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 ...
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2answers
1k 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 ...
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2answers
373 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 ...
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1answer
87 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 ...
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2answers
897 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 ...
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2answers
72 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 ...
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1answer
103 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. ...