Switching Circuits

Electronic circuits can be broadly classified as either analogue or digital. In an analogue circuit the input and output signals are continuously variable within certain physical limits set by the devices and circuitry and often bear a simple functional relationship to each other. Linear amplifiers and sine-wave oscillators are examples of analogue arrangements. In contrast digital circuits operate with signals that can take only discrete values, usually few in number. Intermediate values cannot be sustained and occur only momentarily as the signal is changed from one discrete state to another.