Electronic Engineering Dictionary

"A" "B" "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

"P" to Pd", "Pe" to "Pg", "Ph" to "Pi",
"Pi" to "Pn", "Po" to "Pot", "Pow" to "Pq", "Pr" to "Pz"

Pulse:

Pulse. A signal characterized by a steep rise from and decay toward an initial level.

Pulse Shape
PULSE AVERAGE TIME. The time duration from a point on the leading edge which is 50 percent of the maximum amplitude to a point on the trailing edge which is 50 percent of the maximum amplitude [tW1 or tW2 in the diagram below].

PULSE DELAY TIME. The time interval from a point at which the leading edge of the input pulse has risen to 10 percent of its maximum amplitude to a point at which the leading edge of the output pulse has risen to 10 percent of its maximum amplitude [Pd in the diagram below].

PULSE DROOP. Also called Voltage Droop. The reduction in output level caused by driving a load. Detailed Voltage Droop Definition

PULSE DURATION (PD). The period of time during which a pulse is present, measured at the 50 percent point.

PULSE FALL TIME. The period of time during which a pulse falls from ninety percent of its initial high value to ten percent of its final value, or steady state value. Fall Time Graph. [Tf in the diagram below].

PULSE OVERSHOOT. The amount of voltage rise above the steady state value. Overshoot occurs on the initial rise of the signal pulse.

PULSE RATE. The time interval between the start of one pulse and the beginning of the next pulse, measured at the same voltage level for both pulses. Also called Pulse-Repetition Rate [PRT], Pulse Rep Rate. Also see Pulse-Repetition Frequency [PRF].

PULSE RISE TIME. The period of time during which a pulse rises from ten percent of its initial value to 90 percent of its final value, or steady state value. Rise Time Graph. [Tr in the diagram below].

PULSE STORAGE TIME. The time interval from a point 10 percent down from the maximum amplitude on the trailing edge of the input pulse to a point 10 percent down from the maximum amplitude on the trailing edge of the output pulse. [Ts in the diagram below].

PULSE TIME. The time interval from the point on the leading edge which is 90 percent of the maximum amplitude, to the point on the trailing edge which is 90 percent of the maximum amplitude. [Tp in the diagram below].

PULSE UNDERSHOOT. The amount of voltage rise "fall" below the steady state value. Under-shoot occurs on the final fall of the signal pulse.

PULSE WIDTH. Duration of time between the leading and trailing edges of a pulse.

Pulse Characteristics

t_r = Pulse Rise Time.
t_d = Pulse Delay Time.
t_p = Pulse Time.
t_s = Pulse Storage Time.
t_f = Pulse Fall Time.
I = Pulse Amplitude.

Design note; not all cases will result in an output waveform that just gets delayed in time from the input waveform. The test circuit below is a schematic to test the pulse response of a 2N718A transistor. Note the difference between the input waveform and the expected output signal.

2N718 Pulse Response Test Circuit