Low noise microwave frequency synthesizer having fast switching

Details Low noise microwave frequency synthesizer having fast switching Low noise microwave frequency synthesizer having fast switching

2007-05-08

2007-05-08

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C331S016000, C331S018000, C375S365000

Reexamination Certificate

active

11414034

ABSTRACT:
A frequency synthesizer and a method using a first seed word and a variable clock rate derived from a second seed word for synthesizing a signal frequency. An accumulator accumulates the first seed word at the variable clock rate with a remainder word for updating a reference word at the variable clock rate. The reference word has a most significant bit (MSB) and less significant bits (LSB)s. The remainder word corresponds to the LSBs at overflows of the MSB. A tracking filter filters the MSB for providing a filtered output signal having an output frequency derived from the first seed word and the variable clock rate. The variable clock rate is derived by direct synthesis from the second seed word and single sideband frequency upconversion. The tracking filter can be a phase lock loop with frequency upconversion.

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patent: 2005/0041766 (2005-02-01), Thompson

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