I/Q modulator using current-mixing and direct conversion...

Details I/Q modulator using current-mixing and direct conversion... I/Q modulator using current-mixing and direct conversion...

2005-12-22

2009-08-25

Payne, David C (Department: 2611)

Pulse or digital communications

Transmitters

Angle modulation

C455S324000, C332S117000

Reexamination Certificate

active

07580478

ABSTRACT:
The present invention relates to an I/Q modulator using a current-mixing method used for a direct conversion wireless communication transmitter. In accordance with the present invention, an EVM of a wireless communication system, a linearity and a power consumption are improved by converting a D/A converted signal to a current level and then performing a frequency modulation.

REFERENCES:
patent: 2004/0106380 (2004-06-01), Vassiliou et al.
patent: 2004/0214547 (2004-10-01), Kim et al.
patent: 2005/0170806 (2005-08-01), Kim
patent: 2005/0282510 (2005-12-01), Bang et al.

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