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Questions tagged [rise-time]

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.

1 vote
1 answer
39 views

Trying to figure out rise/fall times for different load conditions

I have a device that requires a certain rise/fall time for its input clock. It specs a .7ns rise and fall time with a 20% to 80% measurement at a Cin=6pf. I should note that the spec rise/fall time ...
Matty's user avatar
  • 217
0 votes
0 answers
71 views

Relation between rise and fall times and capacitance

So I'm currently reading the datasheet of the Motorola 68hc000 CPU and I want to be able to estimate how many devices I can plug to the bus directly before I encounter issues. So first things first, ...
Lugaid's user avatar
  • 101
0 votes
1 answer
42 views

Rise time to an input

A device trigger input requires 1 V pulse (can stand up to 6 V) and has 0.5 V threshold voltage. Now if I apply a 5 V pulse with 10 ns rise time, how can I estimate the time it takes a rising edge to ...
cm64's user avatar
  • 2,193
0 votes
2 answers
148 views

Measuring rise time with spectrum analyzer

Is it possible to measure the rise time (range 100ps-1ns) of a square wave signal with a spectrum analyzer (my oscilloscope has 100MHz bandwidth only)? My model is Rigol 3030N (9kHz-3GHz). My idea is ...
piotr's user avatar
  • 292
1 vote
0 answers
68 views

Understanding CLoad of a gate driver and the Cgate of an SiC MOSFET

I have selected an SiC MOSFET (UJ3C120040K3S) for my pulsed power application. My rise and fall time requirements are both 20 nS. My gate drive voltage will be 15 V. Based on the total gate charge ...
power_electronics_engineer's user avatar
0 votes
0 answers
44 views

Slow rise time in power supply

Does power supply slow rise time affect the UVLO start threshold voltage to turn on the IC (tps54316mpwprep)?
Surya Bharathi's user avatar
0 votes
0 answers
42 views

Power Supply rise time and configuration

Reset managment: from HW checklist and datasheet of USB2517 (page 48), is required a rise time for the 3V3 maximum of 400us. In our case it will be above 1ms. In this case, is it necessary to use a ...
user avatar
0 votes
0 answers
40 views

What happens if rise time specification is not met

I have a design where an NXP i.MX8M nano CPU has a KSZ8081RNAIA Ethernet Phy connected. During prototype testing, we found now that the supply voltage rise time provided by the CPU PMIC (NXP PCA9450B) ...
Freshman's user avatar
1 vote
0 answers
115 views

MOSFET Gate Resistor Problem in CHG, DSG pins

I am trying to design a BMS circuit by using BQ77915 . My charge and discharge mosfets are CSD18534KCS. They are only using for switching. The problem is BQ77915 datasheet says for gate resistors of ...
Nafi Can Ereli's user avatar
2 votes
4 answers
169 views

In an RC circuit, how do you explain the fast rise of voltage at a point close to source? (Weak pull up)

In the above figure, the voltage at the intermediate point rises quickly whereas the voltage after R2 is increases slowly ( as governed by the capacitor voltage.) I am not getting the intuitive ...
Dynamic_equilibrium's user avatar
3 votes
2 answers
289 views

Output with programmable rise time

I am tinkering with a device to generate pulses for a measurement setup. No need to buy it: Just wondering how one would implement it. Idea: Device generates a square-wave (Vpp and DC-offset) output ...
ElectronicsStudent's user avatar
3 votes
1 answer
180 views

Will the LVDS signal rise time improve after a counter IC?

I want to improve an LVDS signal's rise and fall time. With a Cyclone III FPGA, the LVDS signal has a 500 ps rise and fall time. If I apply these signals to a counter/divider IC like the SY100EP33VKG ...
Ahmet Atcı's user avatar
1 vote
0 answers
521 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
  • 10.8k
5 votes
1 answer
1k views

LTspice capacitor bug?

I know that capacitor slows the rise of voltage, but why is this not happening in the LTspice simulation? I got the input voltage at the output instantly.
NBK SOFT's user avatar
  • 107
2 votes
2 answers
393 views

How to speed up rise time on logic shifter?

I am trying to boost a 3.3V data signal to 5V, and I'm using a logic shifter to achieve that. Basically, I'm trying to drive WS2813 LEDs, and the data line needs something close to Vdd (5V) to read ...
MiataMan's user avatar

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