Pulse-swallowing counter
{{Short description|Component in all-digital feedback systems}}
A pulse-swallowing counter is a component in an all-digital feedback system. The divider produces one output pulse for every N counts (N is usually a power of 2) when not swallowing, and per N+1 pulses when the 'swallow' signal is active. The overall pulse-swallowing system is used as part of a fractional-N frequency divider.Integrated Frequency Synthesizers for Wireless Systems, Andrea Lacaita, Salvatore Levantino, and Carlo Samori, Cambridge University Press, 2007, p. 24 The overall pulse-swallowing system cancels beatnotes created when switching between N, N+1, or N−1 in a fractional-N synthesizer.Manassewitsch, Vadim. 1987. Frequency Synthesizers: Theory and Design, 3rd Ed., John Wiley & Sons, {{ISBN|0-471-01116-9}}, pp. 43–48.