Overshoot

1. In the transition of any parameter from one value to another, the transitory value of the parameter that exceeds the final value.

Note: Overshoot occurs when the transition is from a lower value to a higher value. When the transition is from a higher value to a lower value, and the parameter takes a transitory value that is lower than the final value, the phenomenon is called "undershoot."

2. The increased amplitude of a portion of a nonsinusoidal waveform, i.e., signal, at the output of a nonlinear circuit, e.g., a realizable amplifier, caused by the characteristics of the circuit. .

Note 1: Overshoot causes distortion of the signal.

Note 2: Overshoot may result from circuit design parameters that are intended to decrease the response time of the circuit.

Note 3: The amount of overshoot in a given circuit is designed to minimize response time while maintaining distortion of the signal within acceptable limits. The absence or presence of overshoot, and if present, its magnitude, is a function of a circuit design parameter called "damping[?]." See illustration under waveform.

3. The result of an unusual atmospheric, e.g. , ionospheric, condition that causes microwave signals to be received where they are not intended.

Source: from Federal Standard 1037C and from MIL-STD-188