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Q&A

Posts tagged opamp

Synonyms: opamps operational-amplifier operational-amplifiers op-amp op-amps

Anything related to operational amplifiers (a.k.a. as op-amps or opamps).

Opamps are linear amplifiers with very large open-loop gain that are designed to be used in a negative feedback circuit. Closing the loop through suitable feedback networks allows building incredibly many useful circuits (linear and non linear), making the opamp a very flexible device and essentially an universal basic building block in modern electronics.

Nowadays modern opamps are all integrated circuits, although the original idea and implementation date back to the age of vacuum tubes and telegraph lines.

This tag doesn't have a detailed wiki yet.

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Q&A MOSFET drain current ringing in saturation region

I benchtested below 0.7A constant current source circuit and observed few cycles of oscillation on drain current. With the help of bode plot analysis , I have managed to reduce the oscillations on ...

2 answers  ·  posted 2mo ago by kadamrohan16‭  ·  last activity 1mo ago by Olin Lathrop‭

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Q&A What is Ground Electrode in EMG?

*Learning about EMG as a part of our research. My team has at least some experience with electronics that is worth mentioning, but don't have any experience with EMG/bio-potentials. Most EMG hardwa...

2 answers  ·  posted 8mo ago by tilly‭  ·  last activity 8mo ago by TonyStewart‭

Question opamp
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Q&A Essential safety features of an EMG/medical grade device?

EMG consists of an electrode gel skin interface, op-amps with a certain gain and an ADC. Question is in the context of passive electrodes. What are the essential safety features of such types of h...

3 answers  ·  posted 8mo ago by tilly‭  ·  last activity 8mo ago by TonyStewart‭

Question ADC opamp
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Q&A Can the corner frequency of thermal noise change with change in source impedance?

In EMG there is a certain level of thermal noise created at the electrode-gel-skin interface which depends on the skin-electrode impedance (also known as source impedance). I have been able get th...

2 answers  ·  posted 8mo ago by tilly‭  ·  last activity 8mo ago by TonyStewart‭

Question opamp
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Q&A Correct way to think about thermal noise?

I have just started learning about thermal noise in op-amps and while studying could not find if the noise given in op-amps data sheets is random sample to sample regardless of the time interval be...

1 answer  ·  posted 9mo ago by Joel‭  ·  last activity 8mo ago by Lorenzo Donati‭

Question noise opamp
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Q&A Design rules for opamp bootstrapping

Here is the bootstrapping technique for opamps, as exposed in the Art of Electronics:. This technique is supposed to increase considerably the input impedance of the opamp for an AC input source (...

2 answers  ·  posted 3y ago by coquelicot‭  ·  edited 9mo ago by Lorenzo Donati‭

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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 -> relay with LC filter ...

3 answers  ·  posted 3y ago by 2kind‭  ·  edited 9mo ago by Lorenzo Donati‭

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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 3y ago by rpm_2718‭  ·  edited 9mo ago by Lorenzo Donati‭

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Q&A How building a follower satisfying rather extreme requirements.

What is your best suggestion for building a follower that would ideally satisfy the following spec: frequency: from 100 Hz (or lower) to 1 GHz input signal impedance: 1 Mohm input signal ampli...

1 answer  ·  posted 3y ago by coquelicot‭  ·  edited 9mo ago by Lorenzo Donati‭

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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 3y ago by MissMulan‭  ·  last activity 9mo ago by Lorenzo Donati‭

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

I am planning to use the LM318 operational amplifier to generate a PWM signal and I need to know how to calculate the rise/fall time. LM318/LM218/LM118 datasheet -The slew rate is 70 V/µs maximum...

1 answer  ·  posted 1y ago by deleted user  ·  edited 9mo ago by Lorenzo Donati‭

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Q&A DC offset correction loop (DC servo loop). What's its advantage, compared to a high-pass RC filter?

Once in a while in literature I see a DC offset subtraction loop. Here are a few more examples. DC servo loop removes a DC offset after an op-amp. DC servo loop removes DC current from a photo...

2 answers  ·  posted 12mo ago by misk94555‭  ·  edited 9mo ago by misk94555‭

Question DC opamp integrator
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Q&A Is the noise of op-amps and ADCs Gaussian, possibly with zero mean?

I understand that white noise is not always Gaussian. In general, is the $V_{pp}$ and $V_{RMS}$ noise stated in operational amplifier and ADC datasheets Gaussian? And is its mean zero? Any exemptio...

1 answer  ·  posted 9mo ago by Joel‭  ·  last activity 9mo ago by Lorenzo Donati‭

Question noise ADC opamp
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Q&A What we call this opamp configuration? [SOLVED]

1- What we call this opamp configuration? 2- What's the advantage and the disadvantage of this circuit? 3- And what's the purpose of the L2 in the feedback? I have changed gradually the value of...

1 answer  ·  posted 1y ago by deleted user  ·  edited 1y ago by deleted user

Question opamp
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Q&A Op Amp Hartley oscillator

Im designing a Hartley oscillator this time with a opamp providing the open-loop gain.I have tried drawing the small-signal analysis of my circuit to use KVL and KCL to find the conditions of opera...

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

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Q&A DAC controlled high side current source.

I'm designing a high side current source that can be controlled with a Digital-to-analog and can source up to 100mA with voltage supply up to 36V. By high side I mean one side of load will be alwa...

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

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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 2y ago by Mu3‭  ·  edited 2y 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 3y ago by Mu3‭  ·  last activity 3y ago by Olin Lathrop‭

Question noise opamp
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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 3y ago by z3333‭  ·  last activity 3y ago by coquelicot‭

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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 3y ago by timelyfiasco‭  ·  last activity 3y ago by coquelicot‭

Question opamp
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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 4y ago by Andy aka‭  ·  last activity 4y ago by Andy aka‭

Question errors output opamp