555 Timer LED Flasher - What is Pulse Signal ?




Pulse Signal

  • A Pulse form is shaped by a fast or quick transient change from a starting point value to a higher or lower level value, which returns to the same starting point value after a certain time period.
  • This kind of signal can be called as Pulse Signal.
 Pulse Signal

Pulse Signal

  • A Pulse signal is a unidirectional signal which is similar to a square signal but it is not equal like a square wave.
  • A series of continuous pulse signals is called as a pulse train.
  • The pulses indicate a fast high-level and a low-level transition from a starting point level which can be indicated as ON/OFF respectively.
  • If an electric switch is given a pulse input, it gets ON/OFF according to the given pulse signal.

Pulse Signals Terms

 Pulse Signal

Pulse Signal Terms

  • Pulse width
    • It defines the Length of the pulse
  • Period of a waveform
    • Measurement from any point on one cycle to the same point on next cycle
  • Duty cycle
    • Ratio of the pulse width to the period
  • Rise time
    • Time signal takes to rise from 10% to 90% of its maximum amplitude.
  • Fall time
    • Time signal takes to fall from 90% to 10% of its maximum amplitude.
  • Overshoot
    • It means when leading edge of a waveform exceeds its normal maximum value.
  • Undershoot
    • It means when trailing edge of a waveform exceeds its normal maximum value.
  • Ringing
    • Both undershoot and overshoot are followed by damped oscillations known as ringing

The damped oscillations are the signal variations that indicate the decreasing amplitude and frequency of the signal. These oscillations are simple troubles known as ringing.


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