Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2006-02-07
2006-02-07
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
C327S238000, C327S258000
Reexamination Certificate
active
06995595
ABSTRACT:
A direct conversion receiver having a DC offset eliminating function that eliminates a DC offset component in which an oscillator generates a local frequency signal, A first phase shifter shifts a phase of the local frequency signal from the oscillator by 90°, a first frequency mixer mixes the received radio frequency signal and the local frequency signal from the oscillator, a first low pass filter low-pass filters an output signal of the first frequency mixer, a second phase shifter shifts a phase of the received radio frequency signal by 90°, a second frequency mixer mixes output signals of the first and second phase shifters, a second low pass filter low-pass filters an output signal of the second frequency mixer, a subtracter subtracts an output signal of the second low pass filter, and a DC offset component generated by a direct conversion receiver is eliminated. Accordingly, the receiver prevents a dynamic range of the direct conversion receiver to be narrowed in order to increase a resolution thereof.
REFERENCES:
patent: 3761829 (1973-09-01), Spaulding
patent: 5760622 (1998-06-01), Ishigaki
patent: 6148181 (2000-11-01), Otaka
patent: 6847255 (2005-01-01), Petrovic et al.
patent: 2003/0220086 (2003-11-01), Birkett
patent: 877476 (1998-11-01), None
Dilworth & Barrese LLP
Samsung Electronics Co,. Ltd.
Tra Quan
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