Questions tagged [integrator]

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3answers
966 views

DC gain of non-inverting integrator / Derivation of DC results from transfer function

(The pictured circuit contains a serious mistake, see my answer for more detail. I decided to leave the question in its original form for educational purposes, though.) Setting The (sub-)circuit in ...
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1answer
332 views

Dual slope ADC Problem

Here is my try at the problem, A 3.5 digit implies the count varies from 0 to 1999.So for a 2V full scale the LSB or the resolution is 1mV. Now the input is integrated for 300ms and the integrated ...
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1answer
730 views

How is the integration time set for a camera?

I using the TSL1401R-LF Linescan Camera Module, which reads in a 1 X 128 line of pixels, and I'm having trouble understanding how the integration time is set for this device. I understand from page 9 ...
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0answers
2k views

voltage controlled oscillator

Given below is a VCO circuit. Can anyone explain how the components work (especially the resistors and capacitors) and why the resistor and capacitor values are selected so. and what are the values to ...
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1answer
11k views

Difference between an ideal integrator and a practical one

I only learned about the ideal integrator design (top circuit), but when I searched for a practical model for an integrator I found it was like the one in the bottom circuit. Two new elements, Rf and ...
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1answer
2k views

AC Op-amp Integrator with DC Gain Control

I found a link http://www.electronics-tutorials.ws/opamp/opamp_6.html that discusses about AC Op-amp Integrator with DC Gain Control I am wondering how I derive the frequencies (1/CR2 and 1/CR1) ???
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1answer
341 views

op amp circuit application

I am unable to determine the function of this circuit. The second stage looks like an integrator, but the presence of a pot in stage 1 really confuses me...
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1answer
2k views

What is the purpose of resistor at the input of the OpAmp?

I have just seen this integrator circuit here. As seen from the picture, there is a resistor at the positive input of the OpAmp. Could you explain what is the purpose of this resistor?
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2answers
109 views

How to perform a \$\dfrac{1}{s+a}\$ type integration in MATLAB?

Currently, I am integrating an ODE of the form \$\dot x = f(x,t)\$ in MATLAB using the function ode45 This is equivalent (in block diagram form) as passing \$\dot x\$ through an integrator \$\dfrac{1}...
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2answers
2k views

Op Amp Integrator Circuit - Why is there a linear current and voltage for a short time before exponential values?

Consider the following integrator circuit: Why doesn't the current through the capacitor and voltage across it behave exponentially? There is a straight section in the beginning, up to around 2ms - ...
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2answers
9k views

Op-amp integrator response to square wave

simulate this circuit – Schematic created using CircuitLab I would like to study the frequency responce of this op-amp integrator to a square wave. By setting a frequency of 10KHz and the pp-...
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1answer
208 views

Fall time for integrator with a large resistor

I know how to find the Outputvoltage when the circuit is "turned on" (Input x DCgain x (1-exp(-t/a)) , a=time constant , t=time )..but.. How to calculate how fast the output voltage will go to zero ...
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2answers
283 views

Dual-slope ADC working?

I have been reading about dual slope ADC from this material. It states that During ramp down, a counter counts the number of clocks until the output voltage reaches zero. The number in the ...
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1answer
2k views

Practical Opamp integrator problem

The opamp has an unity gain of 1 MHz.So when the resistor in parallel acts a feedback to bias the opamp stable.So if not for the capacitor,the circuit would have been a inverting amplifier with gain ...
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4answers
1k views

A practical integrator that does not behave like a low-pass filter?

Op-amp integrators and some common integrators actually are low-pass filters in practice. So if a signal is DC, then it does not integrate but only multiplies by some amount plus some transient ...
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0answers
211 views

Design issues with an integrating ADC

I have designed a dual slope integrating ADC on Multisim, but I am having some practical limitations. To switch between the input voltage and the reference voltage, I am using the following switching ...
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2answers
129 views

Linear Oscillator Frequency Problem

I was doing one of the problem sets when I stumbled upon this gem. I know that for oscillation to occur, the gain has to be greater than 1. The loop gain I computed is Could anyone suggest any ...
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1answer
402 views

Can I get help with measuring particle charge using oscilloscope?

How can one measure particle charge using oscilloscope and op amp integrator circuit along with a capacitor and faraday cup. I am unable to figure out how to approach. I have the circuit ready but ...
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3answers
535 views

Error in op-amp integrator due to delay in attaining second summing point constraint

An op-amp in negative feedback forces both inverting and non-inverting inputs to the same value. But this takes some time which as per my knowledge is few nanoseconds. So won't this time delay cause ...
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2answers
4k views

How does the RC time constant affect behavior of a passive integrator/differentiator?

I'm reading the first chapter of the AoE. I've come across this section on differentiator/integrator circuits and couldn't understand the math behind it. For the first picture, it says small RC means ...
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1answer
2k views

Get triangular wave on pspice

I designed a integrator op-amp on pspice. I want to get triangular waves for output and square waves for input. Input is OK, but I can't get triangular waves. What is wrong, should I use a second op-...
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2answers
965 views

Laplace transform for RC integrator

This is my RC integrator: From my two different analysises: $$ V_{out}(s) = V_{in}\dfrac1{sRC} $$ and $$ V_{out}(t) = \dfrac1{RC}\int V_{in} dt $$ These are of course different as one is in the ...
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1answer
119 views

Simple RC-Circuit (Neuron): get \$u(t)\$ as a function of time

I am trying to understand how a LIF-Neuron (please take a look) works and how I come from this: $$ I(t) = \frac{u(t)}{R} + C \frac{du}{dt} $$ by multiplying the equation by \$R\$ and call \$\tau_m = ...
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2answers
467 views

Leaky integrator from Switched capacitor integrator?

I have seen leaky integrator circuit using a capacitor and resistor in parallel between inverting terminal and the output of an op-amp. But I was wondering if it is possible to make a leaky integrator ...
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1answer
167 views

Charge pulse to current conversion

I have a photodetector device that outputs charge pulses proportional to incident light. From the device's datasheet (here) and some infor provided by the manufacturer (here), I've understood that ...
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1answer
1k views

Op Amp Integrator not working with DC Source

I am creating an Op-Amp Integrator circuit in Multisim. It seems to work for sinusoidal voltage inputs, square wave inputs, etc but when I connect it to a DC source the output voltage (channel A in ...
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1answer
501 views

RC integrator behavior

I am trying to implement an RC integrator circuit in my design. The purpose of this circuit is to convert input pulse signals swinging between 0 to 2.5V into a ramp signal. The integrator circuit was ...
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3answers
2k views

Generation of triangle wave at 15KHz frequency

I want to generate a triangle wave with peak value 5V. I am using a 555 timer to generate square wave pulse of frequency 15KHz. Then I passes this square wave through a active integrator ( A opamp ...
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3answers
12k views

What is the purpose of a resistor on the non-inverting terminal of an Op-Amp Integrator? [duplicate]

I have seen this type of circuit design a few times, but am not sure why it is needed. Considering the schematic below, what is the purpose of resistor R3?
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1answer
733 views

Comparators as op-amp integrator

So I figured I need an audio range function generator and was thinking of generating a square wave with a 555 and then using op-amps to integrate it into a triangle and sine. Since I happen to have ...
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0answers
97 views

Anti-windup scheme for PID controller [duplicate]

this is the designed pid controller and i am using TL084 op-amps which has +15 volts and -15 volts as their supply. when the error is generated, due to integrator the control signal(Vc) output is ...
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4answers
3k views

Anti-wind up scheme in the implementation of PID controller

I want to implement designed PID controller. But I am facing the problem of how to limit the saturation limit in both positive and negative direction? I tried using zener diode, but I would like to ...
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1answer
671 views

What does the feedback capacitor do in Right-Leg-Driver?

It so happens I have seen some people mention about connect a feedback capacitor across the opamp for RLD would improve something better. Can someone capable to explain about the use of the ...
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1answer
687 views

Confused about exponential equation in First Order Integrator Circuit

I have a problem above, where the question goes as such: I have a Miller Integrator Circuit as such: Now, I pass in a square wave pulse of 1V height and 1ms Width Now, I have a resistor of Rf = 1M ...
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1answer
385 views

Film capacitors, replacing with ceramics

I've been watching through hole film caps disappear. I've used a bunch of these in thermal control loops, http://www.digikey.com/product-detail/en/ECQ-E1106KF/EF1106-ND/56416 Still making 'em, but ...
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2answers
181 views

Integrator with Voltage on IN+ and measuring Vout and V-?

I know the ideal integrator topology and output equation. But - what is the affect of connecting a supply at the positive input (instead of GND)? How can that be calculated mathematically for NODE1 ...
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1answer
146 views

Integrator inputs

I'm giving an integrator a rectified and inverted sin wave. I assumed in my initial design that because you feed the input of an integrator into the negative terminal of the op amp, the signal will ...
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3answers
2k views

Why charging time is same and discharge time is different for two inputs in dual slope integrating ADC?

For different input voltages in dual slope ADC, charging time remains same but discharge is proportional to the magnitude of the input voltage. How it works in that way ? Charging time is independent ...

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