Qorvo Solves Entire Non-Uniform Distributed Power Amplifier MMIC
Qorvo, a leader in high-performance RF components for wireless communication, designs wideband power amplifier monolithic microwave integrated circuits (MMICs) suitable for electronic warfare (EW) systems. These systems require amplifiers with high power, wide bandwidth, and high efficiency to which Qorvo researchers have developed power amplifier MMICs utilizing the non-uniform distributed power amplifier (NDPA) approach. Showcasing impressive results, these NDPA MMICs are designed for saturated operation. This requires accurate electromagnetic data up to the 5th-7th harmonic frequency, which results in a very large mesh/matrix. Because solving the entire structure was not practical, it was never attempted, but upon hearing about the nearly linear scaling in the AWR AXIEM planar EM simulator within the AWR Design Environment platform, Qorvo fellow Chuck Campbell elected to take the AXIEM challenge.
Prior to EM, Qorvo had never attempted to simulate the entire MMIC circuit of their NDPA, which includes more than 32 ports and, for a gridded planar EM tool, upwards of 30,000 unknowns.
Nevertheless, Campbell decided to put the AXIEM simulator to the test. The result: the entire structure from DC to 120GH was solved in under two minutes per frequency using a quad-core desktop PC with 4G RAM (32-bit OS).
What’s more, the software’s shape pre-processor and hybrid adaptive meshing algorithms meant that the final mesh size was little more than 6,000 unknowns, which was highly efficient.
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