Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation
Reexamination Certificate
2004-05-11
2008-03-04
Urban, Edward F. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency or phase modulation
C455S304000, C455S324000
Reexamination Certificate
active
07340232
ABSTRACT:
The invention provides a receiving system and a transmitting system capable of decreasing an offset between differential signals and between quadrature signals and improving a manufacturing yield and a semiconductor integrated circuit device for processing a wireless communication signal having therein the systems. A receiving system includes: a local oscillator for generating an oscillation signal in a desired frequency; a 90-degree phase-shifting circuit for generating a signal by shifting a phase of the oscillation signal output from the local oscillator by 90 degrees; a first mixer for mixing one of differential reception signals with an output signal of the first 90-degree phase-shifting circuit and outputting frequency-converted differential signals; and a second mixer for mixing another one of the differential reception signals with an output signal of the local oscillator and outputting frequency-converted differential signals.
REFERENCES:
patent: 7107036 (2006-09-01), Gehring
patent: 7116953 (2006-10-01), Kim et al.
patent: 2002/0081990 (2002-06-01), Asikainen et al.
patent: 11-055342 (1999-02-01), None
A. Parssinen, “Direct Conversion Receivers in Wide-Band Systems”, Kluwer Academic Publishers.
Harasawa Yoshiaki
Igarashi Yutaka
Ikuta Isao
Murakami Motoki
Yamamoto Akio
Hannon Christian A.
Mattingly, Stanger Malur & Brundidge PC
Renesas Technology Corp.
Urban Edward F.
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