Method and apparatus for a fully digital quadrature modulator

Details Method and apparatus for a fully digital quadrature modulator Method and apparatus for a fully digital quadrature modulator

2005-08-11

2008-12-02

Odom, Curtis B (Department: 2611)

Pulse or digital communications

Transmitters

C375S261000, C375S298000, C332S103000, C332S104000, C332S105000

Reexamination Certificate

active

07460612

ABSTRACT:
A novel apparatus and method for a fully digital quadrature architecture for a complex modulator. The complex modulator can substitute for existing prior art analog quadrature modulator structures and those based on a digital polar architecture (r, θ). The modulator effectively operates as a complex digital-to-analog converter where the digital inputs are given in Cartesian form, namely I and Q representing the complex number I+jQ, while the output is a modulated RF signal having a corresponding amplitude and phase shift. The phase shift being with respect to a reference phase dictated by the local oscillator, which is also input to the converter/modulator. Several embodiments are provided including modulators incorporating dual I and Q transistor arrays, a single shared I/Q transistor array, modulators with single ended and differential outputs and modulators with single and dual polarity clock and I/Q data signals.

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