Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2008-07-01
2008-07-01
Mai, Tan V. (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
Reexamination Certificate
active
07395289
ABSTRACT:
A frequency synthesizing and back-end processing circuit and method thereof are provided. This circuit includes a fully digital frequency synthesizer by using interpolation and a linear feedback shift register to synthesize a frequency. After digital-to-analog conversion, it provides two options of the digital and analog signals. Then the selected signal will be mixed by the corresponding mixer. Finally, the filer removes the undesired noise to obtain the desired synthesized frequency signal. This frequency synthesizer does not require complex digital or analog circuits and can achieve a high frequency resolution with a lower circuit complexity, which is superior to the conventional art. The present invention also includes mixers for different frequencies and filters for back-end processing.
REFERENCES:
patent: 4454486 (1984-06-01), Hassun et al.
patent: 5399984 (1995-03-01), Frank
patent: 6563350 (2003-05-01), Warner et al.
Jianq Chyun IP Office
Mai Tan V.
Novatek Microelectronics Corp.
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