Quadrature mixer circuits and mobile terminal using the same

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion

Reexamination Certificate

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Details

C455S326000, C455S333000, C327S102000, C327S103000

Reexamination Certificate

active

10706278

ABSTRACT:
Because there are different voltages at two current output terminals of a current divider, the voltages at the current input terminals of two current switch circuits are not affected mutually even with a large amplitude of local signals. Accordingly, the performance of a quadrature mixer can be enhanced by increasing the amplitude of the local signals. Bias currents are supplied to the two current switch circuits through the current divider from a common DC current source which essentially supplies a bias current to a V/I converter and, therefore, power consumption is reduced.

REFERENCES:
patent: 6029060 (2000-02-01), Ashby
patent: 6084466 (2000-07-01), Phanse et al.
patent: 6121818 (2000-09-01), Kim et al.
patent: 6433647 (2002-08-01), Filoramo et al.
patent: 6933766 (2005-08-01), Khlat et al.
patent: 6999745 (2006-02-01), Leenaerts
A. Karimi-Sanjaari et al., “A GHz Merged CMOS LNA and Mixer for WCDMA”, 2001 Symposium on VLSI Circuits Digest of Technical Papers, Jun. 2001, pp. 19-22, Tokyo, Japan.

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