Ichiro Aoki

TL;DR: In this article, the performance of the newly introduced distributed active transformer (DAT) structure to that of conventional on-chip impedance-transformations methods is analyzed, and a 2.4-GHz 1.9-W 2-V fully integrated power-amplifier achieving a power-added efficiency of 41% with 50/spl Omega/ input and output matching has been fabricated using 0.35-/spl mu/m transistors.

TL;DR: In this article, a distributed active transformer is presented to combine several low-voltage push-pull amplifiers efficiently with their outputs in series to produce a larger output power while maintaining a 50/spl Omega/match.

TL;DR: In this article, a new family of switching amplifiers, each member having some of the features of both class E and inverse F, is introduced, which have class-E features such as incorporation of the transistor parasitic capacitance into the circuit.

TL;DR: Concentric distributed active transformers (DAT) are used to implement a fully-integrated quad-band power amplifier in a standard 130 nm CMOS process that produces up to +35 dBm of RF power with power-added efficiency of 51%.

TL;DR: In this paper, a novel structure distributed active transformer (DAT), which significantly reduces the coupling from the DAT to the feed line is demonstrated, and an air-bridge connected double primary DAT structure is implemented.