Mixcomm, Inc.

Kang Ning

Harish Krishnaswamy

Arun Sridhar Natarajan

James F Buckwalter

Methods and apparatus for implementing a power amplifier circuit assembly an uneven power splitter which feeds two power amplifiers of different amplifier classes are described. By supplying different amounts of power to different amplifier circuits having different performance curves, an overall combined amplifier performance having a relatively uniform, e.g., flat, performance curve over a wide range of frequencies is achieved. In at least some embodiments one of the amplifiers is a class B power amplifier and the other amplifier is a class C power amplifier. In some but not necessarily all embodiments a phase shift is introduced on a signal path to one of the power amplifiers to compensate for a difference in phase shifts introduced by the power amplifiers which are used in parallel.

Methods and apparatus for supporting linearization on power combined power amplifiers

Methods and apparatus for implementing a power efficient amplifier device through the use of a main (primary) and auxiliary (secondary) power amplifier are described. The primary and secondary amplifiers operate as current sources providing current to the load. Capacitance coupling is used to couple the primary and secondary amplifier outputs. In some embodiments the combination of primary and secondary amplifiers achieve high average efficiency over the operating range of the device in which the primary and secondary amplifiers are used in combination as an amplifier device. The amplifier device is well suited for implementation using CMOS technology, e.g., N-MOSFETs, and can be implemented in an integrated circuit space efficient manner that is well suited for supporting RF transmissions in the GHz frequency range, e.g., 30 GHz frequency range. The primary amplifier in some embodiments is a CLASS-AB or B amplifier and the secondary amplifier is a CLASS-C amplifier.

Power amplifier

Methods and apparatus for implementing passive wideband phase shifters are described. The phase shifters exhibit good linearity over a wide range of frequencies. Furthermore at least some features are directed to allowing the phase shifters to be implemented in some embodiments in a relatively compact manner making such embodiments well suited for supporting arrays and/or other implementations where a large number of phase shifters are to be implemented in a relatively small chip area.

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Lawrence, NJ, United States of America

Kang Ning