Spectrally constrained local oscillator switching

Details Spectrally constrained local oscillator switching Spectrally constrained local oscillator switching

2011-06-07

2011-06-07

Le, Thanh C (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S318000, C455S323000

Reexamination Certificate

active

07957715

ABSTRACT:
A method and frequency converter for a radio rapid frequency signal scanning and including a local oscillator signal synthesis source (112) producing a local oscillator signal (502) with local oscillator bursts (210). The local oscillator bursts (210) contain pulse width modulated RF frequency pulses (602). Each local oscillator burst having, for a pre-determined duration, RF frequency pulses within an effective amplitude above a pre-determined threshold (260). Each local oscillator burst (210) having also has effective amplitude pulse shaping envelope (504) that reduces at least one frequency domain component magnitude (310) of the local oscillator signal (300). A radio frequency mixer (110) receives an RF signal input (104) and the local oscillator signal to produce an output signal (160) at a frequency related to a combination of a frequency of the RF signal input and a frequency of the local oscillator signal.

REFERENCES:
patent: 7805124 (2010-09-01), Friedrich et al.
patent: 2004/0113833 (2004-06-01), Lee
patent: 2005/0170807 (2005-08-01), Rebel
patent: 2008/0003971 (2008-01-01), Vaisanen
K.J. Kuntz et al—“Pulse Shaping and Signal Modulation Techniques to Imporove the Multipath and Noise Performance of Nartrowband Precision RF Ranging” —2002 IEEE Canadian Conference on Electrical & Computing Engineering—pp. 358-363.
Harold P.E. Stern et al—Ni Developer Zone—National Instruments Corp—Communication Systems: Analysis and Design—20041—17 pages.

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