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Questions tagged [slew-rate]

Anything related to slew rate (SR in datasheets), i.e. a characteristic parameter of analog amplifier circuits (notably operational amplifiers). The slew rate of an amplifier is the maximum rate of variation that the input signal can exhibit in order for the output amplified signal to follow it without distortion.

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8 votes
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Unreasonably low slew-rate of a DAC0800 and TL072-based waveform generator

I'm building a simple waveform generator based on the Raspberry Pi Pico, a DAC0800 IC and a TL072 op amp. The circuit works, but the slew-rate is - I believe - unreasonably low for the components I'm ...
Peter Lenkefi's user avatar
0 votes
2 answers
160 views

Generate a fast, high amplitude pulse for measuring slew rate

I need to create a test set-up that measures slew rate of a few op-amps. The fastest slew rate among all of the op-amps in my list, belongs to NE5532 with 9 V/us slew rate and output amplitude of ±10 ...
Fateme's user avatar
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5 votes
2 answers
757 views

Slew rate and Bandwidth for 5 MHz signal

I'm trying to amplify a sine wave signal with opamps of high bandwidth and slew rate. It works fine up to about 700 kHz, then the gain decreases and about 1 MHz it's only 1, when it should be about 5. ...
Gos's user avatar
  • 589
0 votes
0 answers
48 views

Audio signal likely spectral distribution (What op-amp slew rate for audio - in practice?)

If I'm processing an audio signal (assumed 20 Hz - 20 kHz) in an op-amp circuit and I need to select the slew rate, the simple and obvious, yet conservative answer is \$SR \geq 2\pi f V_{\text{peak}}\$...
Theodore's user avatar
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2 votes
1 answer
79 views

Current slew rate specification of op-amps?

I know that slew rate specifies how fast the output voltage of an op-amp can change. But is there a measure that specifies how fast the output current of op-amps can change? I need this information ...
Mustafa Turhan's user avatar
2 votes
4 answers
812 views

Are these low frequency FFT components due to insufficient op-amp slew rates?

In my circuit I have three op-amps in (direct) series connection: AD8422 acting as an input buffer (a large input impedance is needed) with a fixed gain (slew rate: 0.8 V/us) LTC6910 being used as a ...
Maxim's user avatar
  • 167
0 votes
1 answer
86 views

Measuring Slew Rate of an op-amp

I am trying to measure Slew Rate of the BA4580Rxxx op-amp. I want to apply a pulse using Max038 waveform generator IC to the input of the op-amp. Then, read the output of the op-amp with an ADC. While ...
Fateme's user avatar
  • 338
2 votes
3 answers
186 views

Why is step response of an opamp linear/exponential?

My step response for LM741 at LTSpice was this: And for TL081: So as you can see the response of LM741 is linear and of TL081 is exponential, but why? My schematic is an inverting amplifier with v=...
M S's user avatar
  • 21
2 votes
2 answers
147 views

Clamp transistors in folded cascode for slew rate improvement

Razavi's textbook Design of Analog CMOS Integrated Circuits (2nd edition) includes a possible option of improving the slew rate of a folded-cascode amplifier in Figure 9.77, included below (along with ...
Halleff's user avatar
  • 675
1 vote
1 answer
87 views

How to achieve very slow slew rates in n-channel mosfets? [closed]

I am designing a DC load with 20 parallel power MOSFETs. Each to carry 3 A at most. So, the power dissipation will not be a problem. I am trying to achieve as slow as 1 mA/µs current slew rate and ...
Nkgunel's user avatar
  • 31
1 vote
2 answers
238 views

Effect of GBW and slew rate for "small signal"

I would like to better understand how to choose an op amp for high speed application and more precisely I would like to better understand how the GBW and the slew rate influence the transient response/...
Jess's user avatar
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2 votes
1 answer
1k views

How to measure the slew rate of fully differential op-amp?

Shockingly simple question but for some reason I cannot get a configuration to work. I already designed a folded cascode op-amp and I can measure the slew rate using the Cadence function "...
amateurhour's user avatar
0 votes
1 answer
93 views

Can someone give an example of an op-amp whose positive and negative slew rates are different?

Can someone give an example of an operational amplifier whose positive and negative slew rates are different from each other? I have searched for it in the book Design of Analog CMOS Integrated ...
mohammad rezza's user avatar
2 votes
2 answers
261 views

Discerning slew rate and bandwidth limitations

What I get is that, considering a 2 stage OTA, we have 2 effects that limit the amplitude and frequency of the amplified signal: Bandwidth of the amplifier: as the frequency of the input signal gets ...
concerned middle age man's user avatar
1 vote
0 answers
530 views

Are there any published values for GPIO slew rate or rise/fall times on ESP32?

Are there any published values for GPIO slew rate or rise/fall times on ESP32? I had a look at the datasheets and couldn't find any. I also couldn't find any measurements elsewhere. Have Espressif ...
Polynomial's user avatar
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-1 votes
1 answer
382 views

Ideal op-amp used as a digital buffer: rise time

Vo = Vin, so the rise time for both should be the same, but the capacitor takes some time charging. How can I find the charging time without any other information here?
sheetal's user avatar
11 votes
4 answers
4k views

Why is it called "slew rate"?

For curiosity reasons, I want to know why engineers used the term "slew rate" for this op-amp phenomenon, I mean "slew". I googled it and found this: "turn or slide violently ...
Zineddine Haboussi's user avatar
1 vote
2 answers
325 views

Does slew rate specification of an op amp remain valid for an integrator configuration?

I am trying to design an op-amp integrator for a Rogowski Coil based current sensor. The op amp I use is THS4631D from Texas Instruments. It has a slew rate of 1000 V/us according to the datasheet. ...
Sambeet Panigrahi's user avatar
1 vote
0 answers
195 views

How to create an RS485-compatible line driver with an adjustable slew rate?

I need to make an RS485 compatible line driver, capable of 12Mbit/s with fast slew rate, but with the capability to reduce the slew rate to about 50ns rise/fall time when operating at lower bitrates. ...
Timmy Brolin's user avatar
5 votes
2 answers
1k views

How is the slope of the frequency response of an analog active filter defined?

I have seen different types of filters, and different slope values at -20 db, -40, etc. The literature says that the order define the slope, but how? How can it be mathematically justified? For ...
avelardo's user avatar
  • 495
2 votes
1 answer
1k views

Rise time vs Slew Rate

I am using this device which is a LS1046. It list slew rate as 1V/ns to 4V/ns. It is measured over a region of .35XOVDD to .65XOVDD where OVDD is 1.8V So over the range of .63V to 1.17V which is .54V ...
Matty's user avatar
  • 217
-1 votes
2 answers
908 views

How to improve slew rate of LM741?

I am trying to implement a square wave generator with a specific output frequencies (15 - 45 kHz) but I've encountered a problem, the 0.5 V/μs slew rate. From what I've researched the main component ...
PowerTb321's user avatar
1 vote
0 answers
165 views

Slew rate in a transmission line

Let's say I have a 3km long transmission line with a capacitance of C = 50pF/m, the resistance is 100Ohm. The inductance and the conductance per unit length are negligible. If I want to receive the ...
Yoomo's user avatar
  • 363
2 votes
2 answers
2k views

Op-amp speed: bandwidth vs slew rate

I was learning about the difference between op-amp slew rate and bandwidth. Everywhere it says slew rate is a large signal parameter and bandwidth is a small signal parameter. I have few questions: ...
Confused's user avatar
  • 2,593
0 votes
1 answer
333 views

DIY function generator with an operational amplifier

I am trying to make my own function generator. I will make it with adjustable frequency and peak voltage but for test reasons I'm simulating a constant frequency one. My output has distortion which I ...
Tombeki's user avatar
  • 389
-1 votes
2 answers
229 views

What is the uncertainty of the Analog Discovery oscilloscope?

I'm an electrical engineering student and I have to measure the Slew Rate of an opamp (and most importantly its uncertainty). I created a simple voltage follower circuit and I'm using the Analog ...
John Bardeen's user avatar
1 vote
1 answer
187 views

Solid State Relay/High Voltage Switch unacceptable transient behavior

I am using a whole array of IXYS CPC7524 high-voltage switches in one of my designs. Although the design of this specific switch is not made explicit, its characteristics and other products in the ...
Edgar Brown's user avatar
  • 8,476
0 votes
1 answer
80 views

Environment effect on slew rate of operational amplifier

Is there any environmental condition that will affect the slew rate of operational amplifier? I have been searching on it but there is no solid answer.
KnowledgeHunter's user avatar
2 votes
2 answers
1k views

Slew Rate Explanation

I'm currently studying the concept of slew rate and everything I read or watch I don't fully understand. I was hoping that someone could explain it like you were teaching a child. Another question I ...
ALUW's user avatar
  • 237
11 votes
1 answer
2k views

LM358 measured slew rate much higher than spec

I am measuring the slew rate of an LM358 op amp running +/-15V using both unity-gain (+/- 10V input signal = 2/3 full scale) and 'comparator mode' (+/- 1V input to noninv input, inv input grounded). I'...
Sam Gallagher's user avatar
0 votes
2 answers
588 views

Bandwidth vs slew rate

I have some difficulties in understanding the difference between bandwidth and slew rate. I got that we are talking about large or small signal but what if for example the input signal is a PWM one ...
Manzillo's user avatar
0 votes
0 answers
171 views

How to calculate the rise time?

The figure shows a modification, from state A to state B, carried out on the cell at the output of circuit (X). In both cases, the voltage at point A is the same. The transistors M1 and M2 keep the ...
Yakeen's user avatar
  • 1
0 votes
2 answers
290 views

RS485 slew rate limiting remove need for termination

In regards to the highlighted feature of "slew-rate limiting" RS485 ICs. It says in multiple brand datasheets that the slew-rate limiting helps with transmission errors when there is ...
zme's user avatar
  • 337
1 vote
0 answers
306 views

Slow slew rate causes signal inversion, missed pulses

I’m currently revising a legacy design using an old Lattice MACH 5 PLD. One of the (TTL) inputs to the PLD has a slow slew rate on the rising edge, spending some 25ns between 0.8V and 2.0V, and the ...
Zane Kaminski's user avatar
1 vote
2 answers
2k views

Op-Amp Unity Gain Frequency

I'm tasked with finding the unity gain frequency of an op-amp using the datasheet specs provided to me (just a homework exercise, not a real op-amp). There is no direct spec given for "Unity Gain ...
Sittin Hawk's user avatar
0 votes
1 answer
951 views

What is currently the highest slew rate of any available op-amp? [closed]

Also, how is there a theoretical/practical upper limit to slew rates? Suppose a customer wanted an extreme high speed op amp with a slew rate of, say, 5 Volts per femtosecond(which would translate to ...
Mr X's user avatar
  • 734
2 votes
1 answer
230 views

NE5532 slew rate

datasheet: http://www.ti.com/lit/ds/symlink/ne5532.pdf I saw in most opAmps this rate was given as V/us, for example, for LM741 it was 0.5V/us. Is this 9V/ms a typing error? Because if it is not, then ...
muyustan's user avatar
  • 2,106
0 votes
1 answer
574 views

Finding Rise time and Fall time with Slew Rate Specification

I am using this QSPI Flash Memory IC I'm operating the QSPI clock at 48MHz. I am probing the Clock and Data signals in my scope. On Table 54 which is on Page 128, we have Rise time and fall time ...
user avatar
0 votes
0 answers
47 views

Question about charge and discharge of a capacitor

Let's consider the following amplifier: and suppose that a capacitor is connected between the output node and ground. Let's suppose that the inverting terminal becomes much larger than the non-...
Stefanino's user avatar
  • 616
0 votes
1 answer
266 views

Question about the slew rate

Let's consider an op-amp: From basic courses of electronics, we know that the output voltage as a function of the differential input is given by the following picture: Now, assuming that: the op-...
Stefanino's user avatar
  • 616
3 votes
0 answers
323 views

CA3140 wideband output amplifier

The following circuit is nearly exactly what I need for the output stage of my function generator: datasheet: https://www.renesas.com/us/en/www/doc/datasheet/ca3140-a.pdf What I don't understand is ...
pr871's user avatar
  • 1,167
0 votes
1 answer
844 views

Calculation of the slew rate of an inverter with active load

I'm studying the inverter with active load, whose scheme is the following: Now, the author of my book says: "We have to ensure a proper large-signal driving of the output node. The load of the ...
Stefanino's user avatar
  • 616
1 vote
2 answers
298 views

Limit in-rush current for DCDC

We are using a Isolated Fixed-Ratio DC-DC Converter from Vicor (http://www.vicorpower.com/documents/datasheets/ds_BCM4414xG0F4440yzz.pdf) that is powered through a 600VDC accumulator. The DCDC powers ...
Viktor's user avatar
  • 121
-1 votes
1 answer
91 views

Howland source for adjusting slew

I am using a Howland current source and sink in the above circuit for adjusting slew rate, however I am not getting desired results. simulate this circuit – Schematic created using CircuitLab
AAA's user avatar
  • 1
1 vote
1 answer
1k views

Inverting OP AMP SLEW RATE

I'm trying to do a question that requires me to design an inverting op-amp in multisim and find the slew rates in different scenarios using the OPAMP_5T_VIRTUAL operational amplifier model found in ...
Ahsan 's user avatar
  • 15
0 votes
1 answer
93 views

Communication between device for 5 meters and low speeds

I need to make a communication between only two devices with a distance of 5 meters, which are connected by a cable of 4x2.5mm² (see in the image), being 1 wire for GND and wire for 12v, that would ...
Milordy Coutinho's user avatar
1 vote
2 answers
311 views

Why is the slew rate in nMOS amplifiers worst when the output is going from low to high?

Likewise, why is the slew rate in pMOS amplifiers worst in the other case? (Output going from high to low.)
Mafutt's user avatar
  • 11
0 votes
1 answer
213 views

Can an amplifier slew rate be used as a low pass anti-aliasing filter?

A slew rate calculator says that for an arbitrary 100MHz signal a minimum slew rate of 1884V/μS is required. If I used an amplifier with that exact slew rate is it also a low pass filter? It seems ...
RobC's user avatar
  • 155
1 vote
1 answer
520 views

Will the DC offset of signal affect the slew rate in an op amp?

I'm curious if the DC offset of a signal going into an op amp will affect the slew rate. Lets say you have an op amp configured to drive a 150 Ω load and is spec'ed to provided an output swing of ±3 ...
awade's user avatar
  • 71
0 votes
0 answers
157 views

Buffer requirements for S/H circuits

I am trying to solve question 11.10 which is taken from 2001 GATE IN paper. So I think the answer is (a) because the input buffer which faces the analog input needs a higher slew rate in order to ...
Aditya P's user avatar
  • 337