![]() However, as the frequency-domain graph shows, square waves contain a wide range of harmonics these can generate electromagnetic radiation or pulses of current that interfere with other nearby circuits, causing noise or errors. Square waves are used as timing references or " clock signals", because their fast transitions are suitable for triggering synchronous logic circuits at precisely determined intervals. Square waves are typically generated by metal–oxide–semiconductor field-effect transistor (MOSFET) devices due to their rapid on–off electronic switching behavior, in contrast to bipolar junction transistors (BJTs) which slowly generate signals more closely resembling sine waves rather than square waves. Square waves are universally encountered in digital switching circuits and are naturally generated by binary (two-level) logic devices. 4 Characteristics of imperfect square waves. ![]()
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