Selectable local oscillator

Details Selectable local oscillator Selectable local oscillator

2011-04-19

2011-04-19

Mis, David (Department: 2817)

Oscillators

Beat frequency

Plural beating

C331S040000, C331S179000

Reexamination Certificate

active

07928808

ABSTRACT:
A selectable local oscillator provides an output frequency signal having a selectable frequency within a desired output frequency range. The selectable local oscillator comprises first, second and third signal generators configured to provide first, second and third frequency signals having frequencies in first, second and third input frequency ranges. A first mixer provides a first mixed product signal having an upper sideband and a lower sideband. A frequency selector selects one of the upper and lower sidebands of the first mixed product signal. A second mixer provides a second mixed product signal having an upper sideband and a lower sideband. An output stage selects at least one of the upper and lower sidebands of the second mixed product signal as the output frequency signal.

REFERENCES:
patent: 2777953 (1957-01-01), Tollefson
patent: 3721764 (1973-03-01), Dunn
patent: 3940716 (1976-02-01), Gebring
patent: 6324233 (2001-11-01), Sempel et al.
patent: 7221917 (2007-05-01), Kroeger
PCT Search Report of the ISA for PCT/CA2009/001702 mailed Feb. 16, 2010.
PCT Written Opinion of the ISA for PCT/CA2009/001702 mailed Feb. 16, 2010.

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