Combining power amplifiers at millimeter wave frequencies
AssigneeTexas Instruments Incorporated
InventorsKrishnanshu Dandu, Brian Paul Ginsburg
Life of this patent
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Abstract
A system having a set of power amplifiers each having a primary inductive structure configured to provide an output signal. A secondary inductive structure is configured to inductively couple to each of the primary inductive structures. A transmission line is provided with a signal trace and a ground trace. The signal trace of the transmission line is connected to a first end of the secondary inductive structure. A return path from a second end of the secondary inductive structure is coupled via a resonant network to the ground trace of the transmission line, in which the return path is spaced away from the secondary inductive structure to minimize inductive coupling to the primary structures.
Claims19
A circuit comprising:
- a first power amplifier;
- a second power amplifier;
- a first primary winding coupled to the first power amplifier and to a node;
- a second primary winding coupled to the second power amplifier and to the node;
- a secondary winding structure inductively coupled to the first primary winding and to the second primary winding, the secondary winding structure having a first end and a second end;
- a coaxial cable having a signal trace and a ground trace, wherein the signal trace is coupled to the first end of the secondary winding structure;
- and
- a return path for resonant termination on the secondary winding structure, the return path from the second end of the secondary winding structure coupled via a resonant network to the ground trace.
A circuit comprising:
- a first power amplifier;
- a second power amplifier;
- a first primary winding coupled to the first power amplifier and to a node;
- a second primary winding coupled to the second power amplifier and to the node;
- a secondary winding structure inductively coupled to the first primary winding and to the second primary winding, the secondary winding structure having a first end and a second end, the secondary winding structure comprising:
- a first secondary winding;
- and
- a second secondary winding coupled in series with the first secondary winding;
- a transmission line having a signal trace and a ground trace, wherein the signal trace is coupled to the first end of the secondary winding structure;
- and
- a return path for resonant termination on the secondary winding structure, the return path from the second end of the secondary winding structure coupled via a resonant network to the ground trace.
An integrated circuit comprising:
- a first power amplifier;
- a second power amplifier;
- frequency synthesizer circuitry coupled to the first power amplifier and to the second power amplifier;
- a first primary winding coupled to the first power amplifier;
- a second primary winding coupled to the second power amplifier and to the first primary winding;
- a secondary winding structure having a first end and a second end;
- a transmission line coupled to the first end of the secondary winding structure;
- and
- a return path for resonant termination on the secondary winding structure, the return path from the second end of the secondary winding structure coupled via a resonant network to the transmission line, wherein the return path is spaced away from the secondary winding structure.
Dependencies are inferred from the claim text.