A square wave is a type of alternating current (AC) waveform characterized by its distinct shape, where the voltage alternates between two levels, typically a positive amplitude and a negative amplitude, in a rapid and abrupt manner. In a perfect square wave, the transitions between the two voltage levels are instantaneous, resulting in sharp, right-angled corners.
The square wave has the following key characteristics:
Amplitude: The voltage level remains constant during each phase of the wave, jumping abruptly from one level to the other.
Frequency: The frequency of the square wave is determined by the rate at which it alternates between the two voltage levels. In other words, it is the number of complete cycles it completes per second and is measured in Hertz (Hz).
Duty Cycle: The duty cycle represents the proportion of time the square wave spends in the high-voltage level compared to the total time of one complete cycle. It is expressed as a percentage. For a symmetrical square wave (50% duty cycle), the high and low voltages are equal in duration.
Square waves are commonly used in electronics, telecommunications, and signal processing applications. They are particularly useful in testing electronic circuits, driving digital logic gates, and generating digital signals for communication purposes. Square waves can be generated using electronic oscillators or synthesized digitally using microcontrollers or signal generators.