![]() There are, however, select cases in which PFM mode is advantageous. There are practical difficulties in the design of electronics when working with non-fixed frequencies, such as transmission line effects in board layout and magnetic component selection, so generally, PWM mode is preferred. PFM is a method of encoding analog signals into trains of square pulses and therefore has a wide variety of applications. The amplitude and width of the pulses are kept constant. ![]() In other words, the frequency of the pulse train is varied in accordance with the instantaneous amplitude of the modulating signal at sampling intervals. Unlike PWM, in which the width of square pulses is varied at a constant frequency, PFM fixes the width of square pulses while varying the frequency. It is analogous to pulse-width modulation (PWM), in which the magnitude of an analog signal is encoded in the duty cycle of a square wave. Pulse-frequency modulation ( PFM) is a modulation method for representing an analog signal using only two levels (1 and 0). ![]() Represents an analog signal using only two levels
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