Agere Systems Guardian Corp.

M T Homer Reid

Bruce W McNeill

Joseph Harold Havens

This invention provides a phase splitter device that generates in-phase and quadrature outputs that have a phase difference of substantially a phase set value (e.g., 90&deg;) and an amplitude difference of substantially an amplitude set value (e.g., zero). A first feedback loop controls the phase difference between the in-phase and the quadrature outputs while a second feedback loop controls the amplitude difference between the in-phase and quadrature outputs. The phase splitter device controls the amplitude difference and the phase difference between the in-phase and the quadrature outputs by a common mode of control signals and a differential between the control signals, respectively. In this way, the phase splitter device generates in-phasing and quadrature outputs that have a phase difference and an amplitude difference that is substantially equal to the amplitude and phase set values (e.g., zero and 90&deg;) using a single set of control signals.

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Tokyo, Japan

M T Homer Reid