Quadrature mixer circuits and mobile terminal using the same

Details Quadrature mixer circuits and mobile terminal using the same Quadrature mixer circuits and mobile terminal using the same

2007-02-09

2008-08-26

Nguyen, Duc M (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S326000, C455S333000, C327S102000, C327S103000

Reexamination Certificate

active

07418250

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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