What causes voltage undershoot?

In a nutshell: impedance mismatches can cause standing waves or “moving” waves along a conductor. If they build up constructively you get overshoot; if they build up destructively you get undershoot.

What is undershoot voltage?

Undershoot is a negative voltage respect to ground that occurs at the falling edge of the input signal that may inadvertently turn the switch ON. When the switch is at an OFF stage, a negative voltage at VS will create a relative positive VGS, that is, when greater than VT will turn the switch ON (see example below).

What is voltage overshoot?

Voltage overshoots are also known as dv/dt, voltage spikes or line notching. Voltage wave reflection is a function of the voltage rise time (dv/dt) and the length of the motor cables. As wire length or switching speed increases, the overshoot peak voltage also increases.

What causes overshoot and undershoot?

Overshoot occurs when the transient values exceed the final value. Whereas, undershoot is when they are lower than the final value. Furthermore, within the confines of acceptable limits, a circuit’s design targets the rise time to minimize it while simultaneously containing the distortion of the signal.

What is the overshoot phenomenon?

The research behind the overshoot phenomenon says that during prolonged periods of strength training, a significant switch in fiber types, from type IIb to IIa, occurs. After a period of detraining, another fiber type switch will occur – a switch from IIa back to IIb.

What is meant by undershoot?

Definition of undershoot transitive verb. 1 : to shoot short of or below (a target) 2 : to fall short of (a runway) in landing an airplane.

What is undershoot and overshoot in aviation?

If the aircraft is about to touch down beyond that point, the pilot might say he is about to overshoot his touchdown spot. Conversely, if he thinks he’s going to touchdown short, then he might think he is going to undershoot.

What is transient response in voltage regulator?

Load transient response is the response characteristic to a sudden load fluctuation, that is, the time until the output voltage returns to a preset value after having fallen or risen, and the waveform of the output voltage. When the load current drops suddenly, we see that the opposite reaction occurs.

What is transient load test?

The load transient test may be the simplest diagnostic tool available to instantly analyze the loop stability of a system: the visual appearance of the output voltage as the voltage regulator responds to a change in load current directly correlates to phase margin.

What are the causes of overshoot?

The three causes of overshoot are always the same, at any scale from personal to planetary. 2 First, there is growth, acceleration, rapid change. Second, there is some form of limit or barrier, be- yond which the moving system may not safely go.

What is undershoot and overshoot in FPS?

Conversely, undershoot occurs when the transition is from higher to lower, and it’s value is lower than the final value. In electronics, overshoot is the increased amplitude of a portion of a signal at the output of a non-linear circuit, such as an amplifier.

How to reduce overshoot and undershoot in digital circuits?

So you have all the makings right there in the typical high-speed digital circuit. Adding a damping resistor between source and load can dramatically reduce overshoot and undershoot. Also, some digital signals have controllable output strength. Lower drive strength will reduce overshoot and undershoot.

What causes overshoot and undershoot in resonant circuits?

If you stimulate the resonant circuit with a fast positive or negative edge, it will resonate, which includes overshoot and undershoot. Traces can act as series inductors, and digital inputs typically have some capacitance.

How to reduce the overshoot/undershoot of a capacitor?

If off-chip capacitor is not acceptable for the application, the overshoot/undershoot can be reduced by improving the loop bandwidth and/or by augmenting overshoot/undershoot reduction circuit. An example of the said overshoot/undershoot reduction circuit can be found in Leung’s paper published in Jssc, Feb 2010.

How can I reduce overshoot and undershoot?

Adding a damping resistor between source and load can dramatically reduce overshoot and undershoot. Also, some digital signals have controllable output strength. Lower drive strength will reduce overshoot and undershoot.