Ultra-wideband fully synthesized high-resolution receiver...

Details Ultra-wideband fully synthesized high-resolution receiver... Ultra-wideband fully synthesized high-resolution receiver...

2006-11-21

2006-11-21

Vuong, Quochien B. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S207000, C455S209000, C455S315000

Reexamination Certificate

active

07139545

ABSTRACT:
An ultra-wideband receiver system includes an intelligent-preselector stage to up-convert received signals to signals within a first IF frequency-range with stepped first oscillation signals, a first down-converting stage to down-convert the signals within the first IF frequency-range to signals within a second IF frequency-range with a fixed second oscillation signal, and a second down-converting stage to down-convert the signals within the second IF frequency-range to signals within a third IF frequency-range with stepped third oscillation signals. The center frequency of the first IF frequency-range may be at least 30% to 35% higher than a highest frequency in the receive-frequency range to provide an image frequency far from (e.g., more than twice) the highest frequency in the receive-frequency range. The receiver may also include a synthesizer to generate the first, second and third oscillation signals with half-integer frequency dividers based on a master reference signal.

REFERENCES:
patent: 4422053 (1983-12-01), Brewerton et al.
patent: 4695842 (1987-09-01), Jehle et al.
patent: 5307071 (1994-04-01), Arnold et al.
patent: 2003/0194978 (2003-10-01), Vorenkamp et al.
patent: 2005/0003785 (2005-01-01), Jackson et al.

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