Frequency locked digitally tuned oscillator synthesizer

Details Frequency locked digitally tuned oscillator synthesizer Frequency locked digitally tuned oscillator synthesizer

2007-04-24

2007-04-24

Mai, Tan V. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical hybrid calculating computer

Particular function performed

C708S271000

Reexamination Certificate

active

10701914

ABSTRACT:
A synthesizer is disclosed and is digitally tuned and locked in a measured frequency. The synthesizer uses both the dual voltage control oscillator, each operating over less than an octave, in combination with the microwave doublers to produce a multi-octave RF output with low having low harmonics and free of spurious output signals thereon. The synthesizer uses a sampling downconverter that would, without the benefits of the present invention, produce an ambiguous IF output signal that is translated from the VCO microwave frequency. The ambiguity of the sampling downconverter is corrected by using in-phase and quadrature components of the IF output signal produced by the downconverter along with an Arc Tan to generate a series of digital phase data that is compared against a known reference to eliminate the ambiguity of the VCO frequency. The synthesizer further uses at least one clocking source having an output that is selectively filtered to avoid singularity problems normally plaguing downconverters.

REFERENCES:
patent: 5909193 (1999-06-01), Phillips et al.
patent: 6373344 (2002-04-01), Mar
patent: 7012453 (2006-03-01), Coleman et al.

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