Pulse-swallowing counter

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.[1] The overall pulse-swallowing system cancels beatnotes created when switching between N, N+1, or N−1 in a fractional-N synthesizer.[2]

References

Integrated Frequency Synthesizers for Wireless Systems, Andrea Lacaita, Salvatore Levantino, and Carlo Samori, Cambridge University Press, 2007, p. 24
Manassewitsch, Vadim. 1987. Frequency Synthesizers: Theory and Design, 3rd Ed., John Wiley & Sons, ISBN 0-471-01116-9, pp. 43–48.

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[1] Integrated Frequency Synthesizers for Wireless Systems, Andrea Lacaita, Salvatore Levantino, and Carlo Samori, Cambridge University Press, 2007, p. 24

[2] Manassewitsch, Vadim. 1987. Frequency Synthesizers: Theory and Design, 3rd Ed., John Wiley & Sons, ISBN 0-471-01116-9, pp. 43–48.