Raytheon Company

Michael E Yeomans

Jack Lee

James P Dumais

David M Upton

Marc S Wald

Carissa L Pichon

Jack W Lee

A high spectral purity swept local oscillator including a tracking filter. The output of a swept DDS oscillator may be improved by filtering it with a band-pass filter having an adjustable center frequency, which is adjusted in real time to track the instantaneous frequency of the DDS oscillator. The tracking may be accomplished by comparing, using a phase comparator, the phase at the output of the band-pass filter to the phase at its input, and feeding back to the frequency control input of the band-pass filter a signal corresponding to the phase difference measured by the phase comparator.

Phase lock loop with tracking filter for attenuating spurious signals of a swept local oscillator

Embodiments of a synchronous data system and method for generating phase-aligned output data are generally described herein. In some embodiments, the synchronous data system includes a plurality of transmitter-receiver (TX-RX) pairs, each associated with a delay-locked loop (DLL) and arranged to generate corresponding output data stream based on a high-speed clock of the associated TX-RX pair. The DLL associated with each TX-RX pair is a phase-shifter DLL that includes an adjustable phase shifter arranged to minimize the phase error between the system clock and the module clock to edge-align the high-speed clocks of each TX-RX pair.

Synchronous data system and method for providing phase-aligned output data

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Sudbury, MA, United States of America

Michael E Yeomans