Pulses usually refer to pulse-like, transient fluctuations in electrical impulses (voltage or current) often used in electronics. The main features are waveform, amplitude, width and repetition frequency.
Pulses are signals that occur for a short period of time relative to a continuous signal over the entire signal period, and there is no signal for most signal periods. It's like the pulse of a person. Now generally referred to as a digital signal, it is already half the signal in one cycle. The signal inside the computer is a pulse signal, also called a digital signal. In addition, impulses are also used to express thought impulses and impulses.
Pulse waveform and parameters are shown in the figure
Pulse amplitude Um: the value of the pulse wave from bottom to top;
Pulse rise time tr: time elapsed after the pulse wave rises from 10% Um to 90% Um;
Pulse fall time tr: the time it takes for the pulse to fall from 90% Um to 10 Um;
Pulse width tp, tpa, tpb: the duration of the pulse. There are three definitions: the time interval tpa when the pulse front and trailing edges are equal to 50% Um; the time interval tp when the front and trailing edges are equal to 90% Um; the time interval tpa when the pulse front and trailing edges are equal to 10% Um, Also known as the width of the bottom of the pulse, generally measured as tpa as the pulse width, tpa as Ï„;
Flat top landing â–³ Um: The top of the actual rectangular pulse can not remain straight, but inclined to fall shape, called the flat top drop â–³ Um;
On the rushed δ: the rising edge of the pulse exceeds the flat top value Um presented above the protruding part, known as the overshoot δ;
Undershoot d: pulse below the bottom of the drop below the outstanding part of the presentation, known as undershoot d;
Pulse repetition period Tr: time interval between two adjacent pulses, called the pulse repetition period Tr, the pulse repetition frequency fr = (1/Tr);
The pulse duty factor ε: the ratio of the pulse width τ to the repetition period Tr, called the pulse duty factor ε, or "duty cycle";
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