2. The Anatomy of a Pulse

To truly understand how circuits read and react to pulse signals, we need a specific vocabulary to describe the different parts of a pulse waveform. Each of these characteristics helps engineers measure and predict a circuit’s behavior.

• Pulse width: The length of the pulse.
• Period: The time from a point on one cycle to the same point on the next cycle.
• Duty Cycle: The ratio of the pulse width to the period, often expressed as a percentage.
• Rise time: The time it takes for the signal to rise from 10% to 90% of its maximum amplitude.
  • These are critical metrics in digital electronics, as they directly impact the maximum operating speed of a circuit.
• Fall time: The time the signal takes to fall from 90% to 10% of its maximum amplitude.
  • These are critical metrics in digital electronics, as they directly impact the maximum operating speed of a circuit.
• Overshoot: Occurs when the leading edge of a waveform exceeds its normal maximum value.
  • These are considered undesirable noise and can cause logical errors in sensitive circuits if not properly managed.
• Undershoot: Occurs when the trailing edge of a waveform drops below its normal baseline value.
  • These are considered undesirable noise and can cause logical errors in sensitive circuits if not properly managed.
• Ringing: The damped oscillations (unwanted disturbances) that follow both overshoot and undershoot.
  • These are considered undesirable noise and can cause logical errors in sensitive circuits if not properly managed.

Now that we understand what a pulse signal is, let’s explore the devices that create and react to these ON/OFF messages: switches.