Pulse Frequency Modulation
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Pulse-Frequency Modulation (PFM) is a modulation method for representing an analog signal using only digital levels (1 and 0). It is analogous to pulse-width modulation (PWM), to which the reader may refer for more detailed information, as the magnitude of an analog signal is encoded in the duty cycle of a square wave. Unlike PWM, in which the width of square pulses is varied at constant frequency, PFM is accomplished using fixed-duration pulses and varying the repetition rate thereof.
[edit] References
Lenk, John D. (1999). "Circuit Troubleshooting Handbook" p242. McGraw-Hill, New York
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