Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [hysteresis]

112 questions
19
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6 answers

what is "input hysteresis"?

I'm looking at a datasheet for a digital circuit and it specifies that the typical input hysteresis is 100 mV. What does this mean exactly?
umps
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Why is the saturation in the opposite direction different from the saturation?

I am trying to obtain the hysteresis curve of a iron core transformer. To integrate the voltage output from the secondary coil, I used an LM741 opamp, 10k ohm resistor, 0.1uF capacitor, and 1M resistor. This is my setup. Later, I actually added a…
Juye C
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3 answers

Adding hysteresis to over-voltage protection using comparator

I am trying to add hysteresis into my over-voltage detection circuit. The output of the comparator should be high as long as the supply voltage is below 14 V. The circuit works perfectly fine, but I would like to add hysteresis, so that after going…
Axodarap
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3 answers

Can anyone explain why a B-H curve with Hysteresis doesn't result in a highly non-linear input-output transfer function for a transformer?

See the attached picture of a typical hysteresis loop, it is clearly highly non-linear even if you keep the signal small enough to stay out of the saturation region (beyond points b,e). So my question is why does this not result in a non-linear…
user261966
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2 answers

Calculating Slew Rate from a time-constant

I have to choose an op amp mainly based on slew rate. I am using the op amp as a differential comparator with dynamic (time) hysteresis with a time-constant \$3\tau=500\mu\text{s}\$. My upper threshold of the hysteresis \$|U_{\text{th}}|= \pm…
atkristin
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2 answers

Comparator with hysteresis equations

I'm trying to be sure I'm computing the values for this circuit right. Here's an example of the circuit I'm trying to build (it's going in a 12 V DC system, so I filled that in already). I have a textbook from electronics class several years ago…
Matthew
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5
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1 answer

How do I calculate the hysteresis losses of a straight line inductor?

In using a particular type of conductor for an antenna in AC frequencies between 3MHz and 30MHz (HF), it was suggested that magnetic hysteresis losses may be significant if the permeability of the conductor was high. How do I calculate the…
Adam Davis
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5 answers

Is hysteresis needed for this non-inverting comparator?

I’m trying to figure out if the following comparator circuit (TL331) would be reliable in the following application, or whether I would need to add anything, like hysteresis. To explain the application, you have a microcontroller (ESP-32 in this…
Turboduinoz
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2 answers

Scaling voltage to meet two conditions at once

I am using an IC (STM6600) which, among other functions that I need, is also capable of Undervoltage Monitoring. It works like this: The IC monitors VCC in comparison to two thresholds, V_Low and V_High (which is just V_Low+V_Hysteresis). When VCC…
Thomas E
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Hysteresis calculation for "open-collector output comparator" with a pull-up resistor

Standard comparators such as LM2903 and LM311 have open collector outputs. I see many times the output of these comparators are tied to Vcc by a pull-up resistor (e.g. in a Schmitt trigger case). Eventhough there is a question about why it is tied…
user16307
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Comparator with hysteresis; what resistors go where?

Consider the following almost-surely-wrong comparator circuit: simulate this circuit – Schematic created using CircuitLab In various places I've seen similar circuits, some have R3, some have R4, some have neither. Similarly, some have R5, some…
Matthew
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4
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Is magnetic hysteresis present even with a DC bias?

Consider the following circuit: With Vin(t) = A sin(ωt) for some given frequency ω. The relationship between Vin and Vout is certainly non-linear, because of the effect of hysteresis in L's magnetic core. My question: is hysteresis non-linearity…
Cal-linux
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I am facing a problem while designing a Schmitt trigger circuit

I am applying a Schmitt-trigger to the waveform given in the figure below. . This is a 3.5 volt signal and I want to perform thresholding so I use 1.58 volts as upper threshold and 1.17 volts as lower threshold for my Schmitt-trigger circuit. My…
Muhammad Usman
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2 answers

Can a MOSFET be on if there is no current flowing through it?

I am reading about hysteresis comparator here and wondering if a MOSFET can be on if \$V_{gs}\$ is larger than threshold voltage but there is no current flow through it (\$V_{ds}\$ is zero), As you can see in the picture, because M2 is off, there is…
emnha
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Comparator with hysteresis equation for Vmax Vmin

In a scientific paper I came across the comparator circuit with hysteresis shown in the picture. The authors of the paper use this circuit to control the voltage at a capacitor. If the voltage at the capacitor exceeds a level Vdc,max the comparator…
Ziegi
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