Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Reexamination Certificate
2007-02-27
2007-02-27
Nguyen, Duc M. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
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.
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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.
Igarashi Yutaka
Ikuta Isao
Yamamoto Akio
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