Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1998-06-30
1999-11-16
Pascal, Robert
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333136, 330286, 330295, H01P 512, H03F 368
Patent
active
059865180
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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Gorrie Gregory J.
Motorola Inc.
Pascal Robert
Summons Barbara
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