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# Fast Integrator

6 Threads found on edaboard.com: Fast Integrator

## Current mode Flyback converter error amplifier unstable

you do not show whole circuit so it is difficult to help you. But your connection to comp pin is wrong, it should be as an integrator, you are just using the internal error amp as an amplifier.... Also, your vin is a pulsed voltage? Also, you use 1n4007 in RCD clamp, this not good, you must use ultra fast diode there. Do you know uc3844 is 50%

## ideal opamp for integrator

10 pF Cap will integrate and saturate in microseconds. Remember dv/dt=I/C so with C=1e-11 the slewrate is far too fast. Try 1 nF. or calculate what you need.

## dual slope adc opamp gain

I think the most important spec for your opamp and comparator will be offset voltage. There's not really a 'gain' for the integrator, there's a volts/sec constant, and that's going to depend on your requirements. How fast do you need to do the conversion? How fast is your clock? It's going to take 2*2^14 (32786) clock cycles to do a conversion.

## Voltage controlled oscillator and non-inverting schmitt trig

upper circuit (opa1) is an integrator. That means that output voltage changes over time. How fast it change depends of voltage input, and it is inverted. The lower circuit (opa2) is an schmitt-trigger. This o

## OpAmp Integrator with fast current pulse input

joker12, I believe the problem is that the LM124 is not nearly fast enough to respond to such a fast pulse. Your input current pulse is 10^-2 Amperes. This current must be matched by the current through the feedback (integrating) capacitor. The current through the capcitor is i = C dv/dt. Or dv/dt = 10^-2/10^-12 = 10^10 volts/second. I dont be

## What is the use of "C" in this Integrator?

You have a differential integrator. For a perfect differential input signal (where V+ is exactly equal and fazed to V-) C has nonsense. But if V+ and V- (input signals) are fast pulses slighty unfazed (imagine spikes for example) C is acting as an input filter. Without C, the output integrated voltage will swing inequal for Vout+ and Vout- The