What is a Square Wave?

A square wave is a non-sinusoidal waveform that usually appears when processed with electronics and signals. The ideal square wave has only two values, "high" and "low". A signal with a rectangular waveform of current or voltage is a rectangular wave signal. The ratio of the time occupied by a high level in a waveform period is called the duty cycle. . A rectangular wave with a 50% duty cycle is called a square wave, and a square wave has a low level of zero and negative. If necessary, you can specify "low level is zero" and "low level is negative".

In the real world, a square wave has only a limited bandwidth. As general electronic parts have only two values of high (1) and low (0), square waves are naturally generated and widely used in digital switch circuits. Because the square wave can quickly switch from one value to another (ie, 0 1 or 1 0), the square wave is used as a clock signal to accurately trigger the synchronization circuit. But if you use frequency

As already mentioned, the ideal square wave changes instantaneously between high and low values. In fact, this is never possible due to the physical limitations of the waveform generation system. The time it takes for a signal to rise from a low value to a high value and then fall again is called

Fang Bohe

There are many definitions of square waves, and they are all equivalent except at discontinuities.

Sine function

x (t) = sgn (sin (t))

The above formula is equal to 1 when the sine value is positive, and equal to 1 when the sine value is negative, and 0 is at the discontinuity point.

Unit step function u (t) and rectangular function (t)

The square wave integral is a triangle wave, and the triangle wave differential is a square wave.

The triangle wave can be integrated again and again to obtain a sine wave, or converted through a diode network.

The sine wave can be converted into a square wave by a Schmitt trigger or a comparator. ^[3]