Distributed MMIC active quadrature hybrid and method for providing in-phase and quadrature-phase signals
First Claim
1. A quadrature hybrid comprising:
- a first plurality of amplifying elements arranged in a distributed structure for amplifying an RF input signal and providing an in-phase RF output signal; and
a second plurality of amplifying elements arranged in the distributed structure for amplifying the RF input signal and providing a quadrature RF output signal,wherein each amplifying element of the first plurality comprises a first field effect transistor (FET) employing source series inductance, andwherein each amplifying element of the second plurality comprises a second field effect transistor (FET) employing source series capacitance.
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Accused Products
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.
55 Citations
19 Claims
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1. A quadrature hybrid comprising:
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a first plurality of amplifying elements arranged in a distributed structure for amplifying an RF input signal and providing an in-phase RF output signal; and a second plurality of amplifying elements arranged in the distributed structure for amplifying the RF input signal and providing a quadrature RF output signal, wherein each amplifying element of the first plurality comprises a first field effect transistor (FET) employing source series inductance, and wherein each amplifying element of the second plurality comprises a second field effect transistor (FET) employing source series capacitance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of providing in-phase and quadrature-phase signals comprising the steps of:
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amplifying an input signal with a first plurality of amplifying elements arranged in a distributed structure to provide the in-phase signal; amplifying the input signal with a second plurality of amplifying elements arranged in the distributed structure to provide the quadrature-phase signal; providing source series inductance in each amplifying element of the first plurality; and providing source series capacitance in each amplifying element of the second plurality. - View Dependent Claims (17, 18)
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19. An MMIC active quadrature hybrid comprising:
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a first plurality of amplifying elements arranged in a distributed manner for amplifying an RF input signal and providing an in-phase RF output signal, each amplifying element of the first plurality including a first field effect transistor (FET) with a source series inductance; a second plurality of amplifying elements arranged in the distributed manner for amplifying the RF input signal and providing a quadrature-phase RF output signal, each amplifying element of the second plurality including a second field effect transistor (FET) with a source series capacitance; a first transmission line coupling drains of the first FETs; a second transmission line coupling drains of the second FETS; and a third transmission line coupling gates of the first and second FETs, wherein each first and second FET has a gate periphery associated therewith, the first FETs having differing gate peripheries than the second FETs, the differing gate peripheries providing reduced amplitude difference between the in-phase and quadrature-phase RF output signals, and wherein the first and second plurality of amplifying elements and the first, second and third transmission lines are provided on a GaAs MMIC die.
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Specification