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Results tagged with schmitt-trigger
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user 35530
Anything related to Schmitt trigger circuits. Schmitt triggers are positive feedback comparator circuits exhibiting hysteresis.
7
votes
Is a Schmitt-trigger output’s rise time affected by input pulse’s rise time?
Yes, it will likely be affected somewhat. Intuitively you would expect that because at slow input change rate you are depending on the positive feedback to drive the output slew rate. For a fast input …
1
vote
Is this input-output relation correct? Schmitt trigger
This circuit has positive feedback, so (in general) the inputs of the op-amp will not be equal.
The easiest way to analyze this circuit is to look at it at the instant of switching. They have given …
1
vote
Schmitt trigger inverter not properly outputting 5V
Sounds like you forgot to provide a 5V power supply for the chip.
Or the chip is damaged.
1
vote
Discrete Schmitt Trigger: make output logic level at 0V, not 3V
In theory, yes, you could use a negative supply.
Or, since the specs for TTL allow a 400mV output voltage with full noise margin you could use a few hundred mV of that up for the hysteresis and divi …
5
votes
Using a Schmitt trigger IC vs making one from op-amps or transistors
It really depends on the requirements first. If there are multiple ways of meeting the requirements, then things such as using cheaper parts, more available parts (perhaps multiple-sourced) etc. will …
4
votes
Accepted
74HCT14 schmitt trigger doesn't improve rise/fall times
It looks like you've got the oscilloscope displaying some uber-expanded portion of a capture- it's only changing slope every two horizontal divisions .. so anything faster than that all looks the same …
6
votes
Accepted
Schmitt trigger transistor duty cycle
1MHz may seem like a really low frequency but you'll see a lot of effect from storage time in saturated BJTs at that frequency. Here is your circuit (but with 2N3904s substituted since I don't have a …
6
votes
How does this MOSFET-based Schmitt trigger work?
You have a couple good answers as to how it functions, and with low-current MOSFETs it might be suitable for some purposes, however let me illustrate why it's a pretty crummy circuit with 2N7000s (as …
0
votes
Accepted
Strange state in input at the amplifier
The two (sort-of) triangular waveforms are AC-coupled to eliminate the ~Vdd/2 bias and prevent excessive loading of the signal. The 100K resistor and 500K pot adjust the attenuation, then the signals …
3
votes
Why doesn't the following circuit have negative feedback?
The circuit is a Schmitt (after Otto Schmitt) trigger with an added R-C, to make an oscillator. R2, R1, and the op-amp form the Schmitt trigger.
2
votes
Accepted
How to derive the node voltage for this comparator with hysteresis?
Assuming you have some buffering so the comparators swing exactly 5V..
solving numerically to minimize the error squared of the two thresholds and the two hysteresis (using solver software)
R13 = 30. …
1
vote
Schmitt Trigger Comparator 0 - 5V
Replace the part with an inexpensive LMV358 and the output swing will be much more like 0-5V. Note that the maximum supply voltage is 5.5V for the LMV358.
You may be able to get partway there with a …
0
votes
Is a comparator the correct part to choose?
The LM339 (or the dual version LM393) may be okay for this application, based on your stated requirements. Don't forget the pull-up resistor on the output.
One issue is your choice of 1.0V for the th …
4
votes
Accepted
Disadvantages of Schmitt Trigger Inputs
So it might slow the signal by several nanoseconds- I guess that could be significant in some cases.
I don't think they typically draw significantly more power (and power could be less on slow wavef …
1
vote
Schmitt trigger design
Here is my simulation in LTspice, seems to work just fine:
The switching thresholds are almost exactly at the expected 3.5V & 1.5V, when the input is as slow as I've chosen here.
Using an op-amp …