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Q&A

Posts tagged op-amp

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Q&A Is it possible to calculate the rise/fall time of an operational amplifier ?

Hi guys so i am planning to use LM318 operational amplifier to generate a pwm signal and i need to know how to calculate the rise/fall time thank you. LM318/LM218/LM118 datasheet Edit: -The slew...

1 answer  ·  posted 15d ago by Freewell‭  ·  last activity 13d ago by Olin Lathrop‭

Question op-amp rise fall
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Q&A Type II compensation network for a non-ideal transconductance amplifier

I am designing a DC/DC converter in the control loop of which a transconductance amplifier (OTA) is used. This part of circuit looks like this: To determine the needed characteristics, I am usin...

1 answer  ·  posted 1y ago by Mu3‭  ·  edited 1y ago by Mu3‭

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Q&A Input offset voltage/bias current noise contribution in operational amplifiers

In noise analysis of operational amplifiers, the following is considered: Noise generated by the external components (resistors in feedback network etc.) Noise generated by the operational ampl...

1 answer  ·  posted 1y ago by Mu3‭  ·  last activity 1y ago by Olin Lathrop‭

Question op-amp noise
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Q&A Capacitor in 2nd stage of opamp

Inside a op-amp after the stage where the differential signal is converted to single ended , there is further amplification of the DC signal.For AC signals there is a capacitor parallel to the tran...

1 answer  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by Olin Lathrop‭

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Q&A Driving ADC with opamp with large rails

In the image below is an opamp buffer with +/- 15v rails connected to a 3.3v ADC. The input to the opamp is limited to 0-3v. There is no protection circuitry for the ADC. Is the risk of the opam...

3 answers  ·  posted 2y ago by z3333‭  ·  last activity 2y ago by coquelicot‭

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Q&A ESD Protection - Differential Amplifier

More about the circuit The circuit is sensing (low side sensing for many reasons) current used to power up the lights with 28V(part of the schematics not shown here -&gt; relay with LC filter ...

3 answers  ·  posted 2y ago by 2kind‭  ·  last activity 2y ago by Nick Alexeev‭

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Q&A Constant Current Load Circuit with Op Amp

Hi, I built a constant current load following the circuit from https://www.instructables.com/id/DIY-Constant-current-load/ But my op amp gets destroyed after a few minutes. The transistor or the op...

2 answers  ·  posted 2y ago by timelyfiasco‭  ·  last activity 2y ago by coquelicot‭

Question op-amp
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Q&A Amplifier compensation with added resistor across opamp input terminals

This application note from Linear Technology discusses oscillations in opamp circuits and some compensation schemes. One method discussed for reducing phase shifts in the loop gain due to the RC ne...

1 answer  ·  posted 2y ago by rpm_2718‭  ·  last activity 2y ago by Olin Lathrop‭

Question Analog op-amp
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Q&A Op-amp output error voltage

I've built a non-inverting op-amp amplifier with a gain of 101 using this circuit: - My input is 10 mV DC and I expected to measure 1.01 volts at the output but I measure 0.81 volts. What has happ...

1 answer  ·  posted 2y ago by Andy aka‭  ·  last activity 2y ago by Andy aka‭

Question op-amp errors output