Distributed MMIC active quadrature hybrid and method for providing in-phase and quadrature-phase signals
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United States of America Patent
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Nov 16, 1999
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N/A
app pub date -
Jun 30, 1998
filing date -
Jun 30, 1998
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Expired
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Abstract
A distributed MMIC active quadrature hybrid (10) provides in-phase (I) and quadrature-phase (Q) outputs (22, 24) over an octave bandwidth. The quadrature hybrid includes in-phase and quadrature-phase amplifying elements (14, 12) arranged in a distributed manner. The in-phase amplifying elements (14) include FETs (42) with series inductive feedback (44) in the source path. The quadrature-phase amplifying elements (12) includes FETs (52) with series capacitive feedback (54) in the source path. The series inductive and capacitive feedback provides the phase difference between the hybrid's outputs. The FETs of the in-phase and quadrature-phase amplifying elements have differing gate peripheries to provide amplitude tracking over the bandwidth.
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