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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 Dual ratiometric power scaler design review and issues

I need to make a circuit board that has the following inputs and outputs: Inputs and outputs Inputs: $V_{\text{in1}}$ (0-10VDC) PLC controlled signal $V_{\text{in2}}$ (0-10VDC) PLC controll...

1 answer  ·  posted 16d ago by sandwich1699975‭  ·  edited 15d ago by sandwich1699975‭

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Q&A Differential current signal to single-ended voltage conversion

I’m looking for circuits which convert differential current signal into single ended voltage. If found two topologies in application notes, and though of one more [obvious] topology myself. How d...

1 answer  ·  posted 26d ago by misk94555‭  ·  last activity 24d ago by Olin Lathrop‭

Question opamp
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Q&A Single-supply non-inverting op-amp with an output offset. How to create the output offset?

I was looking for electret condenser microphone preamp topologies. I’d like the preamp to run on a single supply, so I’ll have to introduce an output offset. Saw two topologies for introducing th...

1 answer  ·  posted 1mo ago by misk94555‭  ·  last activity 1mo ago by Olin Lathrop‭

Question opamp microphone
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Q&A Photodiode transimpedance amplifier with single supply

I have a photodiode and I want to connect it to an ADC to read the ambient light. For the context, non linearity is not an issue as I'm interested in knowing the amount of light in 3-4 levels. The...

1 answer  ·  posted 3mo ago by DeadMouse‭  ·  last activity 2mo ago by Olin Lathrop‭

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Q&A Summing op-amp 10 meters long

I’ve a linear sensor array (broadside). The array is 10m long and it contains 20 sensors. There’s a limit on the number of wires. I can have a handful of wires running the length of the array, b...

1 answer  ·  posted 2mo ago by misk94555‭  ·  last activity 2mo ago by Olin Lathrop‭

Question Analog opamp
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Q&A OP-AMP PT100 signal conditioner

How does this circuit work, especially considering that it's intended to be used as a PT100 conditioner?

1 answer  ·  posted 3mo ago by erisla‭  ·  last activity 3mo ago by Olin Lathrop‭

Question opamp RTD PT100
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Q&A OPA2211 datasheet discrepancy

Looking at Texas Instruments opamp OPA2211it mentions GBW of 80MHz at a gain of 100, and 45MHz at gain of 1: Looking at the bandwidth graph from Figure 10 in datasheet: It looks like 80MHz is...

2 answers  ·  posted 4mo ago by Elleanor Lopez‭  ·  last activity 3mo ago by Nick Alexeev‭

Question datasheet opamp
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Q&A Purpose of resistance between SENSE/FORCE line of power supply

I am reading through a multi-channel power supply manual and at some point it discusses the ability to chain channels in parallel to increase current output. In the schematic, there is one resisto...

3 answers  ·  posted 7mo ago by dekker‭  ·  last activity 6mo ago by TonyStewart‭

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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 11mo ago by kadamrohan16‭  ·  last activity 11mo 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 1y ago by tilly‭  ·  last activity 1y 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 1y ago by tilly‭  ·  last activity 1y 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 1y ago by tilly‭  ·  last activity 1y 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 1y ago by Joel‭  ·  last activity 1y 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 4y ago by coquelicot‭  ·  edited 1y 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 4y ago by 2kind‭  ·  edited 1y 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 4y ago by rpm_2718‭  ·  edited 1y 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 4y ago by coquelicot‭  ·  edited 1y 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 1y 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 2y ago by deleted user  ·  edited 1y 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 2y ago by misk94555‭  ·  edited 1y 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 1y ago by Joel‭  ·  last activity 1y 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 2y ago by deleted user  ·  edited 2y 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 3y ago by DeadMouse‭  ·  last activity 3y 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 3y ago by Mu3‭  ·  edited 3y 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 4y ago by z3333‭  ·  last activity 4y 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 4y ago by timelyfiasco‭  ·  last activity 4y 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