Anything related to the rise time of a signal. The rise time is a parameter used to characterize abrupt transitions in a signal waveform. It is usually defined as the time needed by the signal to go from the 10% to the 90% of the level it attains at the end of the transition.

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2answers
48 views

Do LED and photodiode rise times matter for time-of-flight (TOF) measurement?

Do I need small rise times of an LED and a photodiode/APD when considering time-of-flight measurement? Given I know rise time of both diodes I am always able to count time of flight by subtracting ...
0
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1answer
39 views

Delayed VCC rise time with Parallax Smart Card Adapter

While implementing a T=0/1 protocol using a smart card reader I had obtained from Parallax, I noticed a behavior when applying power to the card. It seems that once the 3.3v VCC pin is brought high, ...
2
votes
1answer
96 views

Rise/fall time constrains for ADC?

Does the sampling clock rise/fall times for ADCs matter, or they can be virtually 0 seconds? Can they be slow? In particular, I could not find anything about rise/fall time constrains for AD9235. ...
0
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2answers
133 views

74HCT14 schmitt trigger doesn't improve rise/fall times

I have a square wave signal whose rise and fall times are too big to feed into another 74xx-series logic chip, such as the 74HC175 flip-flop, which requires rise and fall times in the nanosecond ...
3
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2answers
106 views

Square signal's rise time and frequency

simulate this circuit – Schematic created using CircuitLab I am analyzing work of amplitude limiter built on transistor, and I can see an incoherence as far as rising times for different ...
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2answers
96 views

Signal distribution, buffers, rise times and EMC

I am designing a DSP based audio mixer. There are 4 AD/DA converters (AD1939 and AD1974) and a DSP (OMAP L138), which is on a carrier module. I am distributing the frame clock (48kHz) and the bit ...
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1answer
115 views

Measuring the rise time of remote device

Given a radio transmitter (like a cell-phone or wireless computer), how can you measure the rise time remotely? I understand that you can use an oscilloscopes to measure it on components at hand, ...
7
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1answer
325 views

How to determine BJT switching time

Is there some standard way to get information about BJT (Bipolar Junction Transistor) rise and fall times (the high power ones) ? In essence a IGBT is a BJT being driven by a FET, so there should be ...
4
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1answer
574 views

Is this measured rise time inaccurate because of limited oscilloscope bandwidth?

I don't have an LCR meter and wanted to learn how to use a fast edge pulse generator and an oscilloscope to do capacitance measurements as an academic exercise. In W2AEW's videos, he builds a simple ...
0
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1answer
159 views

Confusion regarding considering a transmission line as lumped or distributed

I am just elaborating my question. I have came across different formula's to say whether a Transmission line is lumped or distributed. in one of the books i read " Effective length of a electrical ...
4
votes
1answer
221 views

Do long transmission lines degrade rise/fall times, and if so, by what mechanism?

I remember someone telling me long ago that if a voltage step is sent down a transmission line, the step will become smeared as it travels down the line, and the rise time will become degraded. I'm ...
0
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1answer
100 views

What are fast and slow decay timings in the Allegro A3201 low voltage meter?

In the A3901 Low Voltage Meter Driver datasheet Figure 8 on pg. 10 shown below indicates what the output "IOUT 2/3-4" will look like given input "IN1/3 or IN2/4". But Figure 8 does not mention ...
3
votes
2answers
275 views

Square wave generator has nigh-useless output

I have a system that was designed for testing digital components. I have a device in the system which is used for generation and acquisition of digital signals. Now, I will happily admit to not ...
4
votes
2answers
452 views

Building an oscillator out of discrete gates

I want to buid an ocsillator out of discrete XOR gates, I want to acheive 80MHz. I've tried building one from SN74LVC2G86, but rise/fall times I get is about 25ns. Datasheet does not specify the ...
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votes
3answers
2k views

How is rise time related to bandwidth of the signal?

Say, I want to limit the rise time of my digital signal edges to avoid dealing with transmission line effects. How do I determine the maximum frequency of harmonics in my signal knowing that my rise ...