Frequency converter and radio communication device using same

Details Frequency converter and radio communication device using same Frequency converter and radio communication device using same

2007-08-28

2007-08-28

Vo, Nguyen T. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With wave collector

C455S326000, C455S333000

Reexamination Certificate

active

10922556

ABSTRACT:
A frequency converter that performs dual frequency conversion is provided. The frequency converter restricts noise occurrence and enables signal transfer with good linearity. The frequency converter performs dual conversion of a first signal (RF(+) and RF(−)) by using two signals including a second signal (LO1(+) and LO1(−)) and a third signal (LO2(+) and LO2(−)). Using a balun and an amplifying circuit that performs input/output operations in a single-ended manner, the frequency converter restricts NF degradation. By feeding optimum values of current into the first and second switching circuits and into the amplifying circuit, NF and linearity are optimized. The balun, the amplifying circuit, and the first and second switching circuits are formed on the same semiconductor substrate.

REFERENCES:
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patent: 5027163 (1991-06-01), Dobrovolny
patent: 5125111 (1992-06-01), Trinh
patent: 5448772 (1995-09-01), Grandfield
patent: 6351502 (2002-02-01), Zargari
patent: 6711395 (2004-03-01), Tonegawa et al.
patent: 2000315919 (2000-11-01), None
Sjöland, H. et al. (Jun. 2003). “A Merged CMOS LNA and Mixer for a WCDMA Receiver,”IEEE Journal of Solid-State Circuits38(6): 1045-1049.

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