Direct digital synthesizer with frequency correction

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United States of America Patent

PATENT NO 11811415
APP PUB NO 20220407524A1
SERIAL NO

17351529

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Abstract

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A direct digital synthesizer (DDS) circuit. The circuit includes a first input to receive a first fixed frequency clock signal having a first frequency, a second input to receive a second fixed frequency clock signal having a second frequency lower than the first frequency, and an output to provide an output frequency that is based at least in part on a frequency control word (FCW). The DDS circuit may include a frequency correction circuit having a first input to receive the first clock signal, a second input to receive the second clock signal, and a third input to receive the FCW, and an output to provide a frequency error of the first clock signal, the frequency error determined using the second clock signal and FCW. Alternatively, or in addition to, the DDS circuit may include an all-digital phase lock loop to correct for frequency wander of the first clock signal.

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Patent Owner(s)

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

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Cali, Joseph D Merrimack, US 13 54
Srinivas, Shailendra Nashua, US 17 298
Turner, Steven E Nashua, US 24 962

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