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It may be an attempt to apply a "catch all" phrase as an answer, but a sawtooth generator is used to supply sweep. And sweep is used widely in electronics applications. One application might be in the search for signals in a given frequency band using a spectrum analyzer. That band, that group of frequencies, would have to be "swept" by the receiver. It would have to tune in the different frequencies in order and on a continuous basis. By applying a sawtooth wave to a voltage controlled oscillator (VCO) used as the local oscillator in a receiver, the frequency of the VCO could be swept up the spectrum from a starting point to an end point, and then it could be done all over again continuously. The correct sawtooth voltage to the VCO would enable the receiver to make pass after pass across the band under study, and the strength of a signal on a given frequency could be indexed and shown on a display.

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