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Questions tagged [hysteresis]

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2
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0answers
43 views

Asymmetrical Schmitt trigger circuit

I'm designing a circuit to switch a solenoid with hysteresis. I'd like to switch the solenoid off, shown by R12, when the signal is above 0.8V and switch it back when it's below 0.7V. With the ...
0
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1answer
50 views

Magnetic material demagnetization through Curie temperature

It is known that some materials lose their permanent magnetic properties when they are heated above certain temperature known as Curie temperature or Curie point. As those materials are cooled down to ...
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5answers
80 views

Schmitt Trigger hysteresis

I am studying comparators and Schmitt triggers. And I did not find anywhere how to choose the value of hysteresis. I understand its purpose and I know how to calculate it. But what value is needed for ...
0
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4answers
104 views

How can I modify this circuit for some hysteresis and better design?

I need to make a circuit even when the push button pushed and released very fast, the final output will stay ON at 12V for roughly a second. %10 accuracy for the timing is fine. An LED will indicate ...
0
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1answer
38 views

-Ve feedback comparator and its threshold values?

I was trying to analyse and understand the following circuit. My intention was to calculate the hysteresis of the comparator. Circuit working: For both compartor input, there will be voltage inputs ...
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0answers
21 views

Picking Supervisors for a battery with correct Hysteresis

I am trying to find a Supervisors ic that will detect low voltage(5V) on 6v lead acid battery so I can disconnect the battery from the circuit using MOSFET or load driver. how do you calculate ...
2
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4answers
378 views

Magnetic field strength and flux density from hysteresis curve

I am trying to measure the magnetic hysteresis curve of a toroidal nanocrystalline ferromagnetic transformer core made of Nanoperm (datasheet linked) using the following circuit. Each of the windings ...
0
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0answers
74 views

Analytically obtaining the hysteresis of an opamp Schmitt trigger with RC network in its inverting input

This is a follow-up from here. I have got the following Schmitt trigger circuit implemented already on a breadboard. As seen, the input signal at the non-inverting and inverting terminals of the op ...
1
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1answer
113 views

Comparing two variable voltages with hysteresis

All of the designs I have seen for adding hysteresis to a comparator (Schmitt triggers) assume that one of the two inputs to the comparator is set at a fixed reference voltage (typically with a ...
0
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1answer
39 views

Op-amp driving mosfet changes hystheresis thresholds?

I have a non inverting push-pull output op-amp with additional hysteresis (Maxim MAX9015) that should drive an N-Mosfet. I calculated the resistor values for the op-amp(R5, R6, R7) for an older ...
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2answers
234 views

Feedback capacitor in comparator circuit with an OP-AMP

Greetings, This is a scheme of a comparator with dynamic hysteresis. Green line is the output Red line is the input Blue line is the positive feedback. I want to ask for the explanation why C1 does ...
6
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2answers
465 views

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=500µs. My upper threshold of the ...
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0answers
82 views

get reference signal out of PWM signal

]I have the output of my 3 phase inverter (PWM signals) and want to get the reference signal (sinusoidal shaped) out of it. The frequency of my reference signal is assumed to be known. What I have ...
0
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1answer
163 views

How to add voltage thresholds with hysteresis to the input of a voltage regulator?

Device to be used in: solar-powered microcontroller with some peripherals attached. Meant to operate whenever sufficient power is supplied (light is bright enough for a while). No battery, weather ...
0
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1answer
497 views

How to design a comparator using op-amp?

Intention is to design a comparator with following specification: Input: 0V to 1.65V, Output: Low Input: 2.1V to 5V, Output: High This is the TI design doc I have refereed for the design. Please ...
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1answer
94 views

Comparator hystereris

Can someone help me to understand a little better how the hysteresis work in this circuit? I can understand the explanation below why VTRP- = vgs2-vgs1 = .... Also, I didn't find the meaning of the ...
2
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1answer
75 views

Comparator circuit undesirable fluctuations

I have designed a comparator with hysteresis and rail to rail operation and my output depicted in figure1.The inputs of the comparator is a sine wave signal and a triangular waveform as shown below....
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2answers
627 views

Why does hysteretic current-mode control have variable switching frequency?

This figure below is from Raymond B. Ridley Dissertation "A New Small-Signal Model for Current-Mode Control". Here is an except from the document: The general implementation of hysteretic current-...
0
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2answers
56 views

Can I make a peak voltage indicator with a small number of components?

I have a switchmode power supply that rectifies the main voltage with a full bridge rectifier and smoothes it with electrolytic capacitors. Assuming a 115 volt AC power supply, this gives a peak ...
0
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1answer
284 views

How can I calculate the hysteresis of Reed sensor?

As question says, I want to calculate the hysteresis of Reed sensor and I don't know how. As I seen in Reed sensor's documentation, hysteresis may be x/y, or the difference between x and y, and I'm ...
0
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1answer
99 views

Is this AN on comparator with hysteresis wrong?

Reading this datasheet of the LM94022, chapter 8.3, where is shown the following example: I don't know how they get the formulas. I more agree to achieve something like this: taken from this answer. ...
2
votes
1answer
295 views

How to calculate hysteresis when the OPAMP supply voltage is changing

I have designed a GSM/GPS based tracker which is installed at my bike. But it is draining battery too quickly. So, I want to add a cutoff circuit when the bike is not running(battery not charging) ...
0
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1answer
64 views

Transformer Hysterisis

I have the following circuit to plot X-Y plot in an Oscilloscope to get Hysteresis curve. R2 and C2 are kept so that the cutoff frequency of low pass filter formed is less than 2Hz. ...
0
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3answers
577 views

Open-collector comparator with hysteresis and LED indicator at output

I am trying to choose the correct resistor values to make Vout go high when Vbatt falls below 18V and go low when Vbatt rises above 20V. I've built the actual circuit and my measured values are 18.0V ...
1
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1answer
101 views

What causes the uncertainty in the threshold voltage of a CMOS switch?

CMOS switches such as the DG419 have a threshold voltage - i.e. the voltage at which the output state is flipped - which is dependent upon the logic level and the positive supply rail. However, the ...
0
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2answers
391 views

Glitch vs runt pulse due to hysteresis

This is a conceptual question. What I understand is that runt pulse is like a glitch but its amplitude is less than the main pulse's amplitude. If Im not wrong on this definition, below illustartes ...
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5answers
1k views

Stable output from a potentiometer [closed]

A recurring problem with analogue potentiometers is to get a stable output that only changes when the pot is actually moved (i.e. it doesn't output a lot of extremely similar values due to noise or ...
2
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2answers
828 views

Adding hysteresis to a window comparator

I have designed a window comparator and am finding it seemingly impossible to add hysteresis. Below is the basic circuit before attempting to add hysteresis. Now I add a feedback resistor to the ...
0
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2answers
2k views

Hysteresis in CMOS Schmitt Trigger

! How does this circuit work? why do you get different threshold voltages for increasing and decreasing Vin?
0
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1answer
309 views

A question on adding noise and low-pass filer in Ltspice

I’m planning to implement the following Schmitt-trigger circuit: (left-click to enlarge) I made some updates with the great suggestions of jonk in my previous question:Some questions on optimizing a ...
1
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4answers
3k views

Schmitt Trigger Comparator 0 - 5V

I have designed a schmitt trigger circuit using an op-amp where the output switches from 0 - 5V based off an input hysteresis from 2.2 to 2.8V. My circuit correctly switches at the correct voltages ...
0
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0answers
406 views

Debouncing and hysteresis questions about a Schmitt trigger circuit

Above is a switching sensor which outputs ON OFF pulses by the 33k pull-down resistor. V2 and R_SW models the switching. The sensor output is needed to be measured between 1Hz upto 150Hz. I'm planning ...
1
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1answer
124 views

USB-UART FTDI chip VIH

I am working with an FTDI "FT232R" IC [USB to UART conversion], and struggling to understand what the VIH spec of the IC is. I can only find reference to an 'Input switching threshold (VIN)' spec in ...
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0answers
3k views

Hysteresis controller in Simulink

With reference to THIS document's 7th figure, I'm trying to simulate a hysteresis controller with a specified dead band. I have all the components necessary but the comparator block seems to be a ...
5
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2answers
432 views

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 ...
4
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1answer
2k views

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). ...
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3answers
600 views

Hysteresis in a MOSFET's I-V

I've skimmed through several sparse articles online about hysteresis in a MOSFET's I-V characteristics. What I found was sparse, but some articles attribute uneven-ness in the gate structure, causing ...
0
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2answers
174 views

battery overdischage oscillation protection

I previously asked asked an advice on power control of battery operated system. The problem was to cutoff the battery when low to avoid overdisharge. I have built the device according to Olin Lathrop'...
6
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3answers
3k views

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 ...
0
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1answer
145 views

What does E/A mean?

I'm trying to understand how does UCC28703 PWM-controller work. But I don't understand what do the following pictures mean: and . I know they are comparators, but I don't know what does E/A mean ...
2
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1answer
714 views

Intuitive explanation for this hysteresis circuit?

simulate this circuit – Schematic created using CircuitLab I am trying to get an intuitive understanding of this small circuit. I have both breadboarded it to look at behavior on a scope and ...
0
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1answer
174 views

ICL 7673 circuit Hysteresis Resistor values

I'm using the ICL 7673 circuit from datasheet "without external PNP transistors". Please help with deciding Rf and Rs resistor values for 0.5V hysteresis. Any help is much appreciated. Please see ...
2
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2answers
572 views

How to derive the node voltage for this comparator with hysteresis?

I have the following circuit. U26 is a simple unity buffer and U15 is just a dual comparator. I want the top comparator to compare the battery voltage (VBAT/2) on the inverting input with 2.0V ...
2
votes
3answers
947 views

What is the drawback of a high-value resistor for positive comparator feedback / hysteresis?

I'm building a simple circuit which has an LM211 comparator at its heart. The positive input is connected to a 10k-10k resistor divider across the supplies, stabilized by a 1uF capacitor. Hysteresis ...
0
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1answer
2k views

Adding hysteresis to MOSFET used as a switch

I have a low-voltage detection circuit which I use to trigger one of two LEDs (green, and red) that is powered off of a +9V battery cell. As the battery discharges, its output voltage decreases, until ...
2
votes
4answers
932 views

Is there a clever way to prevent a window comparator from oscillating?

Here is my schematic It's basically a crude battery level detector (I am very aware that this isn't the best way to guage battery life, I'm not here for that) it's not crucial that it is super ...
0
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2answers
427 views

Hysteresis not working properly

This question is related to my previous question about the battery charging and discharging. Here is the link to my previous question. I have made a small change in my previous schematic, which is ...
2
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2answers
1k views

Battery charging and discharging problem

I have designed a battery charging and discharging circuit. The main purpose of this circuit is to charge the battery and then discharge, one operation at a time. I have also added a hysteresis of 3....
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2answers
337 views

How to find exact low voltage and high voltage values?

How to find the Hysteresis comparator exact "V high and V low" values
2
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2answers
478 views

Simple circuit reacts to touching a node

I am trying to repeat a circuit from this post. For some reason it does not work properly, and trying to fix it I figure out strange behavior. LED turns on if I touch R3 with my finger or with ...