Pulse circuit is a circuit that generates, shapes and transforms pulse waveform. The pulse circuit consists of two parts: an inert circuit and a switch. The function of the switch is to destroy the steady state and make the circuit transient.

The pulse circuit is represented by high level and low level respectively in the digital circuit as 1 state and 0 state. At this time, the waveform of the electrical signal is non-sinusoidal. Generally, all voltages or currents that are neither DC nor sinusoidal AC are collectively called pulses.