https://electrical.codidact.com/categories/26/tags/6575.rssNew Posts Tagged 'opamp' - Electrical EngineeringElectrical Engineering - Codidact2024-03-10T19:32:41Zhttps://electrical.codidact.com/posts/291023MOSFET drain current ringing in saturation regionkadamrohan16https://electrical.codidact.com/users/562022024-03-10T07:51:17Z2024-03-10T19:32:41Z<p>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 ...https://electrical.codidact.com/posts/289471What is Ground Electrode in EMG?tillyhttps://electrical.codidact.com/users/649252023-08-21T08:09:53Z2023-08-29T00:37:07Z<p>*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 har...https://electrical.codidact.com/posts/289472Essential safety features of an EMG/medical grade device?tillyhttps://electrical.codidact.com/users/649252023-08-21T09:00:27Z2023-08-29T00:27:20Z<p>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.</p>
<p>What are the essential safety features of such ...https://electrical.codidact.com/posts/289534Can the corner frequency of thermal noise change with change in source impedance?tillyhttps://electrical.codidact.com/users/649252023-08-26T05:00:18Z2023-08-28T23:54:00Z<p>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).</p>
<p>I have been a...https://electrical.codidact.com/posts/289336Correct way to think about thermal noise?Joelhttps://electrical.codidact.com/users/645052023-08-11T12:12:56Z2023-08-13T10:17:13Z<p>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...https://electrical.codidact.com/posts/278065Design rules for opamp bootstrappingcoquelicothttps://electrical.codidact.com/users/531102020-09-14T11:04:33Z2023-08-11T12:03:33Z<p>Here is the bootstrapping technique for opamps, as exposed in the Art of Electronics:<img alt="bootstrap" src="https://electrical.codidact.com/uploads/DhdJbRm5BarYY8HTxfzxkQvG">.</p>
<p>This te...https://electrical.codidact.com/posts/279592How to create current sourcesCircuit fantasisthttps://electrical.codidact.com/users/534902020-11-28T10:04:34Z2023-08-10T12:04:04Z<h2>Background</h2>
<p>Constant current sources (simply, <em>current sources</em>) are useful and necessary devices. They are widely used to drive LEDs, charge capacitors and batteries, bias diffe...https://electrical.codidact.com/posts/278989ESD Protection - Differential Amplifier 2kindhttps://electrical.codidact.com/users/534692020-11-06T16:41:23Z2023-08-10T11:59:54Z<p><img alt="Circuit under discussion" src="https://electrical.codidact.com/uploads/sW2MvmGsPEMrtont8Pk3op9y"></p>
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<p><strong>More about the circuit</strong></p>
<p>The circuit is sensing (...https://electrical.codidact.com/posts/277159Amplifier compensation with added resistor across opamp input terminalsrpm_2718https://electrical.codidact.com/users/532312020-08-08T13:14:11Z2023-08-09T21:28:56Z<p>This <a href="https://www.analog.com/media/en/technical-documentation/application-notes/an148fa.pdf">application note</a> from Linear Technology discusses oscillations in opamp circuits and some...https://electrical.codidact.com/posts/281059How building a follower satisfying rather extreme requirements.coquelicothttps://electrical.codidact.com/users/531102021-03-16T08:28:41Z2023-08-09T21:19:44Z<p>What is your best suggestion for building a follower that would ideally satisfy the following spec:</p>
<ul>
<li>frequency: from 100 Hz (or lower) to 1 GHz</li>
<li>input signal impedance: 1 ...https://electrical.codidact.com/posts/282624Capacitor in 2nd stage of opampMissMulanhttps://electrical.codidact.com/users/541072021-07-09T15:51:15Z2023-08-03T19:07:41Z<p>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 t...https://electrical.codidact.com/posts/287435Is it possible to calculate the rise/fall time of an operational amplifier ?deleted user#2022-11-20T19:45:08Z2023-08-03T13:41:20Z<p>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.</p>
<p><a href="https://www.google.com/url?sa=t&source=...https://electrical.codidact.com/posts/288092DC offset correction loop (DC servo loop). What's its advantage, compared to a high-pass RC filter?misk94555https://electrical.codidact.com/users/600912023-05-03T00:14:05Z2023-07-27T16:43:47Z<p>Once in a while in literature I see a DC offset subtraction loop.</p>
<p><img alt="instrumentation amplifier with a DC servo loop" src="https://electrical.codidact.com/uploads/ng4zzswvqxkoeigxw...https://electrical.codidact.com/posts/289056Is the noise of op-amps and ADCs Gaussian, possibly with zero mean?Joelhttps://electrical.codidact.com/users/645052023-07-23T06:38:58Z2023-07-26T15:38:05Z<p>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 exemp...https://electrical.codidact.com/posts/287728What we call this opamp configuration? [SOLVED]deleted user#2023-01-15T21:43:17Z2023-01-17T19:58:06Z<p>1- What we call this opamp configuration?<br>
2- What's the advantage and the disadvantage of this circuit?<br>
3- And what's the purpose of the L2 in the feedback?</p>
<p>I have changed grad...https://electrical.codidact.com/posts/286792Op Amp Hartley oscillatorMissMulanhttps://electrical.codidact.com/users/541072022-07-23T19:00:18Z2022-07-24T12:13:49Z<p>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 op...https://electrical.codidact.com/posts/286103DAC controlled high side current source.DeadMousehttps://electrical.codidact.com/users/541412022-03-12T13:06:13Z2022-04-28T20:28:45Z<p>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.<br>
By high side I mean one side of load will ...https://electrical.codidact.com/posts/283627Type II compensation network for a non-ideal transconductance amplifierMu3https://electrical.codidact.com/users/530142021-08-20T23:01:55Z2021-08-24T09:19:35Z<p>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:
<img alt="Compensator" src="https://electrical.co...https://electrical.codidact.com/posts/282743Input offset voltage/bias current noise contribution in operational amplifiersMu3https://electrical.codidact.com/users/530142021-07-22T13:15:30Z2021-07-22T16:51:31Z<p>In noise analysis of operational amplifiers, the following is considered:</p>
<ul>
<li>Noise generated by the external components (resistors in feedback network etc.)</li>
<li>Noise generated...https://electrical.codidact.com/posts/279900Driving ADC with opamp with large railsz3333https://electrical.codidact.com/users/536642020-12-17T01:23:35Z2020-12-17T18:43:10Z<p>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.</p>
<p><img src="https...https://electrical.codidact.com/posts/277301Constant Current Load Circuit with Op Amp timelyfiascohttps://electrical.codidact.com/users/532092020-08-17T03:36:35Z2020-08-18T15:27:07Z<p>Hi, I built a constant current load following the circuit from <a href="https://www.instructables.com/id/DIY-Constant-current-load/">https://www.instructables.com/id/DIY-Constant-current-load/</...https://electrical.codidact.com/posts/276335Op-amp output error voltageAndy akahttps://electrical.codidact.com/users/529872020-06-27T13:18:35Z2020-06-27T20:42:16Z<p>I've built a non-inverting op-amp amplifier with a gain of 101 using this circuit: -</p>
<p><img src="https://electrical.codidact.com/uploads/a1wUtfaBdtamFCcejDneymrp" alt="Image alt text" /></p...