Multi-modulus divider with power-of-2 boundary condition support

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United States of America Patent

PATENT NO 9900012
SERIAL NO

15099753

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Abstract

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Frequency divider techniques are disclosed which can be used to address two problems: when an incorrect division occurs if the modulus control changes before the divide cycle is complete, and when an incorrect division occurs due to a boundary crossing (e.g., power-of-2 boundary crossing in a fractional-N PLL application). In one embodiment, a frequency divider is provided comprising a plurality of flip-flops operatively coupled to carry out division of an input frequency, and configured to generate a modulus output and receive a divided clock signal of a previous cell. An additional flip-flop is selectively clocked off one of the modulus output or the divided clock of the previous stage, depending at least in part on a Skip control signal applied to a data input of the additional flip-flop, and is further configured to selectively reset the plurality of flip-flops to a state that will result in a correct divide ratio.

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Patent Owner(s)

Patent OwnerAddress
BAE SYSTEMS INFORMATION AND ELECTRONIC SYSTEMS INTEGRATION INCPO BOX 868 NASHUA NH 03061-0868

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cali, Joseph D Nashua, US 8 11
Grens, Curtis M Manchester, US 4 3
Kushner, Lawrence J Andover, US 29 454
Turner, Steven E Nashua, US 19 536

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