With the switching part of the high-resolution covered in the previous chapters, here we deal with a rather mysterious part of the RFDAC design: a power combiner and a matching network, which is realized here as a planar transformer with multiple windings. A step-by-step transformation is presented that starts with a conventional class-E matching to arrive at our new transformer-based matching.
Power combiner; Matching network; Balun; Cascade; Efficiency contour; Power backoff; Switched capacitors
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